Ml Of Acid Research Articles

ADSORPTION OF TEXTILE DYE ACID GREEN 42 (AG42) ON ACTIVATED CARBON FROM CHICKEN EGGSHELLS (CAC30)

The present work is a contribution to the valorization of chicken eggshells, an abundant waste product in Cote dIvoire, as a credible alternative to commercial activated carbon.Chemicalactivation of the precursorwascarriedoutwith30%phosphoricacidfor24h of contactin a ratio of 200 g of material to 100 mL of acid, and calcined at 600°C for 1h. The surface of the activated carbon obtained was studied using the BET (Brunauer-Emmett and Teller) method, which consists in establishing the adsorption isotherm for nitrogen N2. The results reveal a specific surface area of 5.42 m2.g-1, 65.68% of micropores and a pHzc of 7.40. Chemical characteristics determined by Boehms method indicate the basic nature of the surface. The elemental composition is dominated by oxygen(50.53%),calcium(30.78%)andcarbon(11.33%).The experiments demonstrated that the removalof AG42by adsorption on CAC30 is influenced by contact time, activated carbon mass, solution pH, and initial concentration and temperature of the dye aqueous solution. Adsorption kinetics followed the pseudo-second-order model and the isotherm is described by the Langmuir model. The thermodynamic study revealed the spontaneous (ΔG < 0) and exothermic (ΔH < 0) nature of dye adsorption, with a well-organized distribution of dye molecules at the adsorption sites (∆S°< 0).

A miniaturized flow batch chemical vapor generation system for Hg determination in fish by ICP-MS

A new flow batch (FB) system for chemical vapor generation (CVG) is proposed for mercury (Hg) determination in fish. An inductively coupled plasma mass spectrometer was used as a detector. Low-cost peristaltic mini pumps were used to propel the solutions and different configurations of FB systems (reactor/gas/liquid separator) were studied. The proposed configuration of the FB-CVG system allows good sensitivity, low limit of detection (LOD) and low consumption of reagents and sample solutions. In summary, only 1 mL of reductant, 1 mL of acid and 0.16 mL of sample are needed. The proposed method has good linearity, precision (better than 5 %), LOD of 0.008 μg g−1 and LOQ of 0.012 μg g−1, and high sample throughput, allowing 90 measurements/h. The accuracy of the method was evaluated through the analysis of a certified reference material (DOLT-4 Dogfish Liver), whose result is in good agreement with certified value (t-test with 95 % confidence level) and the quantification limit meets current legislations, of 1.0 μg g−1 (Brazil) and 0.3 μg g−1 (EU). In addition, analyte recovery test was done, where Hg recovery was better than 95 %, demonstrating the good analytical performance of the method. To demonstrate the applicability of the method, five samples of fish tissue (muscle) were analyzed. The proposed FB-CVG system, in addition to being low cost, is robust and requires only the volume of reagents necessary for Hg vapor generation, producing a very low amount of waste. It can be concluded that the proposed system can be used for routine analysis for Hg determination in fish tissue. It is worth noting that with the appropriate adjustments, the system can be coupled to different Hg detectors.

Does Acidification Affect Urinary Creatinine in Dairy Cattle?

Nitrogen content in urine plays a crucial role in assessing the environmental impact of dairy farming. Urine acidifications avoid urine nitrogen volatilization, but potentially lead to a degradation of creatinine, the most dependable marker for quantifying total urine excretion volume, affecting its measurement. This study aimed to assess how acidifying urine samples affects the concentration and detection of creatinine in dairy cattle. In this trial, individual urine samples from 20 Holstein lactating dairy cows were divided into three subsamples, allocated to 1 of 3 groups consisting of 20 samples each. Samples were immediately treated as follows: acidification with H2SO4 (1 mL of acid in 30 mL of sample) to achieve a pH < 2 (Group 1)); addition of an equal volume of distilled water (1 mL of distilled water in 30 mL of sample) to investigate dilution effects (Group 2); or storage without any acid or water treatment (Group 3). An analysis of creatinine levels was carried out using the Jaffe method. The Friedman test was employed to compare urine groups across treatments, and the Bland-Altman test was used to assess the agreement between measurements in Group 1 and Group 3. Urinary creatinine values were statistically different (p < 0.001) between Group 1 (median 48.5 mg/dL; range 36.9-83 mg/dL), Group 2 (median 47.5 mg/dL; range 36.5-80.7 mg/dL), and Group 3 (median 48.9 mg/dL, range 37.2-84). Bland-Altman analysis demonstrates agreement between Group 3 and Group 1. The measurement of urinary creatinine using the Jaffe method is affected by sample acidification, but the use of creatinine as a marker for total urine output could remain a viable tool when urine samples are acidified.

Complications of Acute Formic Acid Poisoning: A Series of Five Cases

Formic acid poisoning, although uncommon, carries a high-risk of morbidity and mortality. Five cases (one male and four females) of formic acid poisoning were referred to the Emergency Department within a time frame of 60-120 minutes after ingestion. The age range was between 14 years and 70 years. Three patients had accidental ingestion, while two had ingested the substance with suicidal intent. The quantity ingested ranged from 15-30 mL of undiluted acid. Out of the five patients, two had hypertension, one had both hypertension and diabetes mellitus, and the remaining two did not have any co-morbidities. All five patients presented with orofacial burns, upper abdominal discomfort and dysphagia. One patient experienced mild haematemesis, while another had severe haematemesis. Three patients had altered sensorium due to metabolic acidosis. Four patients developed dark, colacoloured urine and one had gross haematuria. All patients exhibited acute renal toxicity and dyselectrolytemia. Metabolic acidosis was corrected in two patients with a 7.5% NaHCO3 infusion. Four patients improved with haemodialysis and other supportive measures and were discharged within 10-16 days of admission. However, a 60-year-old patient who had gross haematuria and severe haematemesis following the accidental ingestion of 30 mL of acid expired due to severe metabolic acidosis and hypovolemic shock within eight hours of hospital admission.

10% Thioglycolic Acid Peel in the Treatment of Pigmented Purpuric Dermatoses: A Pilot Study.

Pigmentary purpuric dermatosis (PPD) is a chronic dyspigmentation characterized by reddish-brown, irregular maculae with dermal hemosiderin deposition, usually affecting the legs. The -SH group in the thioglycolic acid (TGA) strongly binds to iron molecule, solubilizes it, and clears the pigment. We conducted a longitudinal, right-left leg study for assessing the effectiveness and side effects of TGA 10% peel in treating PPD. For preparation of 10% TGA peel, 80% TGA was diluted with distilled water to 10% concentration by mixing 0.5 mL of acid with 3.5 mL of water before every peel session. The peel was applied on the left leg, weekly for 6 weeks. Assessment was done at baseline and at weeks 3 and 6. Any improvement was noted by the patient and another independent dermatologist. The right leg was untreated. Any side effects during peel application and afterwards were noted. According to the patient assessment, 4/10 patients observed mild improvement, 5/10 patients had moderate improvement, and only a single patient had marked improvement. In the physician assessment, 2/10 patients had >50% improvement, 5/10 patients had 30-40% improvement, and 3/10 patients had 10-20% improvement. Side effects included slight burning during application and foul odor. A single patient had intense erythema and mild swelling of the leg after peel application. 10% TGA is effective in the partial clearance of PPD dyspigmentation with weekly sessions for 6 weeks without any serious side effects.

The Implications of HClO4 for Dissolving Large Masses of Low Level Os in Metal Sulfides and Factors that Influence Re-Os Dating

In general, no more than 1 g of metal sulfide can be completely digested in 20 mL of inverse aqua regia using the Carius tube technique. In this study, the sample weight increased after adding HClO4 to inverse aqua regia while the volume of acid concurrently decreased significantly. Three grams of metal sulfide were digested in 12 mL of acid (3 mL of HClO4 and 9 mL of inverse aqua regia) via the HClO4-inverse aqua regia method. The results using molybdenite reference materials JDC and HLP mixed with 3 g of pyrite were consistent with certified values. Compared to the traditional method, the HClO4-inverse aqua regia method could dissolve a larger sample mass (3 g) with a smaller volume of acids (12 mL). We simultaneously found that the oxidation of digestion acids greatly affected the Os signal but had no influence on the equilibrium of isotope exchange between 185Re and 190Os spikes in Re and Os samples. Remarkably, the heating temperature was the most significant factor influencing the equilibrium of isotope exchange, and the Os in a sample was not equilibrated with the spike until the heating temperature reached 190 °C.

Prevalence and predictors of adverse reactions in plateletpheresis donors with the perspective of donor safety in a tertiary care hospital of Northern India.

BACKGROUND:Plateletpheresis procedures are generally safe and associated with low adverse reactions. Although donor reactions and injuries are self-limited events, they may discourage donors from future platelet donations.AIM:The purpose of this study was to determine the prevalence and predictors of adverse donor reactions in plateletpheresis donors, which could serve as targets for interventions to reduce reactions.MATERIALS AND METHODS:The study included 106 platelet donors over a period of 2 years. The demographic, biometric, and clinical parameters were noted. The data were analyzed for predictors of adverse donor reactions.STATISTICAL ANALYSIS USED:The data were analyzed using independent sample t-test to correlate donor variables such as gender. To correlate other variables such as age, weight, and whole blood processed, Chi-square test was used.RESULTS:A total of 106 plateletpheresis donations were performed and 13.2% of vasovagal reactions were observed. The significant predictive factors for reactions were young female donors with low body weight in which more than 2.5 L volume of whole blood was processed and more than 250 ml of acid, citrate, and dextrose-A was infused and with single venous access procedures.CONCLUSIONS:The results of this study are encouraging and helpful in identifying donors at risk for developing adverse reactions during plateletpheresis so that proper and close observation during and after donation as well as timely intervention can prevent most of the unpleasant events of plateletpheresis donors.

Fabrication of silica ceramic membrane via sol-gel dip-coating method at different nitric acid amount

Fabrication of silica ceramics via the sol-gel method has offered more advantages over other methods in the fabrication of ceramic membrane, such as simple operation, high purity homogeneous, well defined-structure and complex shapes of end products. This work presents the fabrication of silica ceramic membrane via sol-gel dip-coating methods by varying nitric acid amount. The nitric acid plays an important role as catalyst in fabrication reaction which involved hydrolysis and condensation process. The tubular ceramic support, used as the substrate, was dipped into the sol of Tetrethylorthosilicate (TEOS), distilled water and ethanol with the addition of nitric acid. The fabricated silica membrane was then characterized by (Field Emission Scanning Electron Microscope) FESEM and (Fourier transform infrared spectroscopy) FTIR to determine structural and chemical properties at different amount of acids. From the XRD analysis, the fabricated silica ceramic membrane showed the existence of silicate hydrate in the final product. FESEM images indicated that the silica ceramic membrane has been deposited on the tubular ceramic support as a substrate and penetrate into the pore walls. The intensity peak of FTIR decreased with increasing of amount of acids. Hence, the 8 ml of acid has demonstrated the appropriate amount of catalyst in fabricating good physical and chemical characteristic of silica ceramic membrane.

The One Hour Yeast Proteome

We describe the comprehensive analysis of the yeast proteome in just over one hour of optimized analysis. We achieve this expedited proteome characterization with improved sample preparation, chromatographic separations, and by using a new Orbitrap hybrid mass spectrometer equipped with a mass filter, a collision cell, a high-field Orbitrap analyzer, and, finally, a dual cell linear ion trap analyzer (Q-OT-qIT, Orbitrap Fusion). This system offers high MS2 acquisition speed of 20 Hz and detects up to 19 peptide sequences within a single second of operation. Over a 1.3 h chromatographic method, the Q-OT-qIT hybrid collected an average of 13,447 MS1 and 80,460 MS2 scans (per run) to produce 43,400 (x̄) peptide spectral matches and 34,255 (x̄) peptides with unique amino acid sequences (1% false discovery rate (FDR)). On average, each one hour analysis achieved detection of 3,977 proteins (1% FDR). We conclude that further improvements in mass spectrometer scan rate could render comprehensive analysis of the human proteome within a few hours.

Cloud point extraction for determination of lead in blood samples of children, using different ligands prior to analysis by flame atomic absorption spectrometry: A multivariate study

The phase-separation phenomenon of non-ionic surfactants occurring in aqueous solution was used for the extraction of lead (Pb 2+) from digested blood samples after simultaneous complexation with ammonium pyrrolidinedithiocarbamate (APDC) and diethyldithiocarbamate (DDTC) separately. The complexed analyte was quantitatively extracted with octylphenoxypolyethoxyethanol (Triton X-114). The multivariate strategy was applied to estimate the optimum values of experimental factors. Acidic ethanol was added to the surfactant-rich phase prior to its analysis by flame atomic absorption spectrometer (FAAS). The detection limit value of Pb 2+ for the preconcentration of 10 mL of acid digested blood sample was 1.14 μg L −1. The accuracy of the proposed methods was assessed by analyzing certified reference material (whole blood). Under the optimized conditions of both CPE methods, 10 mL of Pb 2+ standards (10 μg L −1) complexed with APDC and DDTC, permitted the enhancement factors of 56 and 42, respectively. The proposed method was used for determination of Pb 2+ in blood samples of children with kidney disorders and healthy controls.

Dynamic versus static ultrasonic sample treatment for the solid–liquid pre-concentration of mercury from human urine

Dynamic and static ultrasonic procedures involving ultrasonic bath and tandem focused ultrasound (i.e. two probes were used in the same sample treatment) have been assessed in order to implement a reliable solid–liquid back extraction of mercury from commercial resins (dowex and chelex-100), previously used to concentrate Hg(II) from treated urine. The urine had been previously treated with an advanced oxidation process provided by the conjunction of potassium permanganate, hydrochloric acid and high intensity focused ultrasound, which allowed that organic matter degradation was achieved in less than 3 min. 95 ± 10% of mercury in the certified urine and 97 ± 6% of the spiked methyl-mercury was recovered with the dowex resin plus the static ultrasonic procedure, whilst 96 ± 11% of the spiked mercury was recovered with the dowex resin plus the dynamic procedure, for which ultrasonication was not necessary. The Hg pre-concentration factor used in this work was 8 (20 mL of urine to 2.5 mL of acid), but different volume ratios can be used in order to increase this factor.

Observations on Dental Structures when Placed in Contact with Acids: Experimental Studies to Aid Identification Processes

In a "mafia" crime case, a magistrate asked us whether it is possible to destroy a cadaver by immersing it in acids, and would it be possible to identify any residues. The aim of this study was to observe the behavior of teeth exposed to four kinds of acid solutions. The teeth were placed in plastic containers with 25 mL of acid and observed. The experiences showed that teeth are completely dissolved after 14 h of immersion in 37% solution of hydrochloric acid, while at 90h in 96% sulfuric acid, the destruction of the samples is still incomplete. In nitric acid the teeth undergo a complete dissolution in 12 h, and in 17 h in aqua regia (chloroazotic acid-hydrochloric/nitric acid 1:3). It was possible to recognize the characteristic morphological features of dental tissues and structures up until the advanced stages of degradation.

Dissolution Kinetics of Sepiolite in Hydrochloric Acid And Nitric Acid

AbstractThe dissolution kinetics of sepiolite in hydrochloric acid and nitric acid were studied in a batch reactor. The effects of reaction temperature, acid concentration, particle size and solid-to-liquid ratio on the dissolution process were investigated. Experimental studies were carried out in the ranges of 25–75°C for reaction temperature, 0.25–1.00 mol/L for acid concentration, 0.00755–0.05020 cm for average particle size and 2.5 to 12.5 g of solid/100 mL of acid for solid-to-liquid ratio. It was determined that the dissolution process is controlled by resistance of the diffusion through the product layer. The activation energies of the process were determined to be 40.8 and 38.3 kJ/mol for hydrochloric and nitric acid, respectively. The apparent rate constants were expressed as a function of reaction temperature, acid concentration, particle radius and solid-to-liquid ratio: kαe−4910(1/T)Cr−0.6 (s/l)−1 and kαe−4606(1/T)Cr−0.5 (s/1)−1 for hydrochloric and nitric acid, respectively; k is the apparent rate constant in min−1; T, the reaction temperature (K); C, the acid concentration (mol/L); r, the initial particle radius (cm); s/l, the solid-to-liquid ratio (g of solid/100 mL of acid).

Appropriate preservation of dairy wastewater samples for environmental analysis.

Thousands of gallons of water are used in dairies to wash cows before milking and for cleaning equipment. The wastewater generated contains elevated levels of organic matter and pollutants, including nitrogen that once converted, may contaminate groundwater with nitrate. This study was conducted to determine the amount of sulfuric acid needed to preserve wastewater samples from a New Mexico dairy in the southwestern U.S. Titrations of wastewater from a local dairy using full strength (18 M) sulfuric acid were performed to determine the amount of acid needed to bring the pH of the sample to below two, the recommended pH for sample preservation. An average of 0.33 mL of acid was required for every 100 mL of wastewater. Due to sample variability, we recommend that 0.4 mL sulfuric acid be added for every 100 mL dairy wastewater sample to ensure adequate acidification. This quantity is twice the amount currently recommended in U.S. Environmental Protection Agency guidelines.

Influence of chloride and sediment matrix on the extractability of HgS (cinnabar and metacinnabar) by nitric acid.

The extractability of metacinnabar and cinnabar, alone or in the presence of some sediment components, with various concentrations of HNO3 (1, 4, 6, and 14 M) was studied. Both forms of HgS (0.2-0.3 mg HgS in 10-20 mL of acid) were insoluble in all HNO3 concentrations as pure compounds. The presence of FeCl3 enhanced solubility of both cinnabar and metacinnabar, especially when concentrated HNO3 was used for the extraction. As the same effect was not obtained in the presence of FeOOH, we concluded that chloride and not Fe3+ was responsible for HgS dissolution. In fact, addition of very low chloride concentration to concentrated HNO3 provoked partial (Cl>10(-4) M) or even total dissolution (Cl>10(-2) M) of HgS. In dilute HNO3 (4-6 M) cinnabar was much less affected by chloride addition than metacinnabar. Extraction of HgS by concentrated HNO3 in the presence of sediment of various salinities demonstrated that the amount of dissolved HgS increased with the increase of the sediment salinity (from freshwater to estuarine and marine sediment), confirming that chloride enhances dissolution of HgS. Removal of chloride by washing the sediment with Milli-Q water significantly reduced dissolution of added HgS during extraction by concentrated HNO3. These results demonstrate that conclusions based on the extraction schemes using concentrated HNO3 as single extractant or as the first extractant in the sequential extraction procedures can be biased. A verification of artifactual oxidation of HgS, when using more concentrated HNO3 as extractant, would help to verify reliability of the applied extraction procedure.

Extractability of HgS (cinnabar and metacinnabar) by hydrochloric acid.

In this work we investigated the behaviour of pure HgS during extraction with dilute HCl to establish its extractability in 1 and 6 M HCl at the concentration level close to those occurring in natural sediments and soils. We found that neither cinnabar nor metacinnabar were soluble in 1 M HCl, whereas both were partially extracted by 6 M HCl. Metacinnabar precipitated in the laboratory was most prone to dissolution in 6 M HCl (up to 90%), followed by crystalline (commercial) metacinnabar (up to 70%) and cinnabar (up to 15%). Solubility of HgS in 6 M HCl was found to be dependent on its concentration, and an exponential relationship between quantity of HgS added to 20 mL of 6 M HCl (the range of 0.1-10 mg was used) and the solubility in 6 M HCl was established. For higher concentrations of HgS (10 mg in 20 mL of acid), a similarly low solubility of cinnabar was obtained as found in the literature. A study of dissolution kinetics of HgS in 6 M HCl indicated that it was a fairly slow process. Unexpected oxidation of HgS in water or 1 M HCl was found for extractions performed in Teflon vials previously used for the digestion of residual undissolved HgS by aqua regia. We presumed that the Teflon material could preserve some oxidising gases (presumably Cl(2)) developed during digestion with aqua regia which can then oxidise HgS during extraction with water or 1 M HCl. Regarding the extraction of Hg from natural sediments, we concluded that 6 M HCl could not be used to extract reactive Hg and predict bioavailability of mercury in sediments containing HgS and that experiments with model compounds should not be done at a concentration level several orders of magnitude higher than in natural samples.

Esophageal Acid clearance: more volume-dependent than motility-dependent in healthy piglets.

The present study investigates manometrically in healthy piglets whether esophageal clearance after distension with different volumes of acid is volume-dependent. Sedated, non-intubated piglets (n = 22) underwent stationary manometry of the esophagus with a 4-probe perfused assembly after successive injection of 1, 2, and 3 mL of saline and acid. Simultaneous pH metering allowed assessment of acid clearance. Wave features and clearance times after saline and acid were compared by paired non-parametric tests and Friedman analysis of variance. The linearity of the relationships between the clearance times and the volumes of acid infused were tested after square root transformations by one-way ANOVA repeated measures. The significance level was set at < 0.05. The motor response was identical after distension with saline and acid except for the largest amount of acid used, which elicited more waves during the first 5 minutes after infusion. Time elapsed until regaining pH4 was longer after higher amounts of acid, but not significantly, whereas that necessary to regain baseline pH was significantly longer after such challenge. Esophageal motility was practically identical after 1 and 2 mL of acid, but it was slightly less effective in the first minute after the 3 mL challenge. There was a linear correlation between clearance times and volumes of acid infused. Up to a certain volume, the motor responses of the healthy esophagus to distension with neutral or acid fluids were similar. Acid clearance was more a function of the amount of acid present than of the motor response elicited by its presence. Only when the amount of acid was large, esophageal motor response was worse than that elicited after equivalent volumes of neutral fluid. The present evidence suggests that long episodes of reflux in pH tracings might reflect large volumes of refluxate as well as disturbed motor function.

Influence of hydrolysis, purification, and calibration method on furosine determination using Ion-pair reversed-phase high-performance liquid chromatography.

The influence of HCI concentration (6M, 8M, and 10M) and the ratio of sample protein to acid (1 or 5 mg of protein per mL of acid) on furosine formation during sample hydrolysis is studied. The conditions that maximize furosine formation are 10M HCI in the ratio of 1 mg of protein to 1 mL of acid. Purification of the hydrolysate by solid-phase extraction is also considered by examining the effect of hydrolysate volume and volume of 3M HCI used to elute the furosine. Furosine quantitation is carried out using the standard additions and external standard methods. The results indicate that there is no interference by the sample matrix and that external calibration is adequate.

Preparation of sulfated zirconia catalysts with improved control of sulfur content II. Effect of sulfur content on physical properties and catalytic activity

The sulfur content of sulfated zirconia can be varied by changing the quantity of sulfuric acid used for impregnation in the controlled impregnation method, in which a pre-set quantity of sulfuric acid is added and evaporated without filtration or decanting. The material is then dried and calcined (in this work, for 5 h at 610°C). The sulfur content of the calcined material increases with the increase in the quantity of sulfuric acid, but the ratio of sulfate retained after calcination to sulfate impregnated decreases at first and then increases. The surface area gradually increases with the quantity of the acid up to 3 ml of acid per gram of zirconium hydroxide (2.5% S in SZ after calcination), then decreases abruptly. The crystal structure of the sulfated zirconia is also affected by the sulfur content. XRD data show that the sulfated zirconia with a low or medium sulfur content crystallizes only in the tetragonal form, whereas at higher sulfur content a minor fraction of monoclinic zirconia begins to be seen, in addition to the major tetragonal form. XPS data indicate that at the higher sulfate loading part of the sulfate is present in the bulk phase, rather than on the surface. Thus, the increase in sulfur uptake, decrease in surface area and change in crystallinity appear related to sulfate migration inside the particles. The catalytic activity for the isomerization of methylcyclopentane at 65°C shows a maximum for a sulfur content around 3%. It appears that the optimum catalyst should contain the maximum amount of sulfate near the surface, but not necessarily on the surface, and crystallize in the tetragonal form.

Determination of Markers in Digesta and Feces by Direct Current Plasma Emission Spectroscopy

A method is described for the preparation of bovine ruminal contents, duodenal digesta, and feces for analysis of Co, Cr, La, Sm, Eu, and Yb by direct current plasma emission spectroscopy. Ground, dried sample was refluxed in concentrated nitric acid until 2 to 3ml of acid remained. The ash was redissolved in 6N HC1. Lithium hydroxide was added to suppress ionization, and the samples were diluted with distilled water for analysis. Element recovery, expressed as the ratio of element recovered from digesta samples augmented prior to ashing compared with those augmented after sample digestion, ranged from 71.5 to 100.5% and was affected by digesta type. Addition of 1000ppm of Li to the sample matrix improved recovery of Co and La from 93.4 and 83.3% to 97.8 and 98.3%, respectively. Lithium did not affect recovery of the other elements. Type of digesta matrix affected emission intensity. Addition of l000ppm of Li to the sample matrices enhanced signal output in the digesta matrices by 25 to 30% for each element. Lithium tended to minimize differences in signal output caused by the organic matrix but did not eliminate them. Increasing Li concentration from l000 to 4000ppm did not increase signal output or completely buffer out the higher emission intensity associated with the organic matrix. Sensitivity of analysis of Co, Cr, and rare earth elements was comparable with or better than sensitivities reported with neutron activation analysis. Results suggest that concentrations of Co, Cr, La, Sm, Eu, and Yb in digesta and feces as low as 2.44, 1.70, 4.20, 1.00, .24, and .92ppm of DM can be analyzed by the described ashing procedure and analytical technique. It is recommended that sample standards be prepared in matched matrices for maximum accuracy.