Determination Of Milligram Amounts Research Articles

Thermal methods of determination of potassium and ammonium in milligram amounts by decomposition of nitritocobaltates(III) of the sodium group

The method of determination of milligram amounts of potassium and ammonium has been worked out. It consists in thermal decomposition of potassium-sodium and ammonium-sodium nitritocobaltates(III) at 300 °C. Nitrogen oxides issued during the decomposition are absorbed in the solution of KMnO 4 and determined by oxidimetric method. The method presented has been applied for determination of potassium and ammonium in the biological material (serum, section of muscle, urine). The method allows determination of potassium and ammonium (based on the mass of the precipitate of nitritocobaltates(III) and amount of nitrogen oxides being issued) with no need for their separation.

A rapid method for the determination of some antihypertensive and antipyretic drugs by thermometric titrimetry

A simple and rapid method is described for the direct thermometric determination of milligram amounts of methyl dopa, propranolol hydrochloride, 1-phenyl-3-methylpyrazolone (MPP) and 2,3-dimethyl-1-phenylpyrazol-5-one (phenazone) in the presence of excipients. The compounds are reacted with N'-bromosuccinimide and the heat of reaction is used to determine the end-point of the titration. The time required is approximately 2 min, and the accuracy is analytically acceptable.

Simple and rapid spectrophotometric method for the determination of tin(II) in binary alkali silicate glasses

A spectrophotometric method for the determination of milligram amounts of tin(II) in binary alkali silicate glasses was developed based on the reaction of tin(II) with iodine monochloride in hydrochloric acid medium. There is no interference from tin(IV) and the method is simple, rapid and accurate. A spectrophotometric method for the determination of total tin as tin(II) in binary alkali silicate glasses by forming a red complex with toluene-3,4-dithiol in a hydrochloric acid medium and measuring the absorbance at 545 nm was also developed.

Biamperometric determination of copper, silver and gold with ascorbic acid

The simultaneous determination of milligram amounts of copper, silver and gold in mixtures is described. Ascorbic acid is added in excess and back-titrated biamperometrically with standard potassium iodate solution. Mixtures can be analyzed by using precipitation and masking

Determination of milligram amounts of sulfur in hydrocarbons by constant current coulometry

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of milligram amounts of sulfur in hydrocarbons by constant current coulometrySabri M. Farroha, Albertine E. Habboush, and Makarim N. MichealCite this: Anal. Chem. 1984, 56, 7, 1182–1183Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published inissue 1 June 1984https://doi.org/10.1021/ac00271a028RIGHTS & PERMISSIONSArticle Views48Altmetric-Citations7LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (266 KB) Get e-Alerts Get e-Alerts

Radiometric determination of monoethanolamine with65ZnSO4

Determination of milligram amounts of monoethanolamine with zinc/II/ by radiometric titration is described.

Potentiometric determination of milligram amounts of organolead in petroleum

For the determination of organolead in petroleum two methods for converting, quantitatively, organolead into lead chloride, and a potentiometric titration method for the measurement of lead chloride, have been developed. The sensitivity, precision and accuracy of the two methods were investigated by analysing a series of standard lead nitrate and synthetic standard solutions. The limits of detection achieved varied from 2.07 × 10–1 to 2.07 × 10–4 g per 100 ml using one method and from 6.22 × 10–1 to 1.66 × 10–4 g per 100 ml using the other method, with an average percentage error of 1–3% and a relative standard deviation that did not exceed ±0.6% for both methods. These two methods were applied successfuly to the determination of lead in petroleum and its fractions before and after treatments.

Lodometric Determination of Milligram Amounts of Semicarbazide Hydrochloride by Hypoiodite Oxidation

lodometric Determination of Milligram Amounts of Semicarbazide Hydrochloride by Hypoiodite Oxidation

Rapid determination of milligram amounts of uranium in organic complexes with pyridine-2,6-dicarboxylic acid as titrant and arzenazo I as indicator after oxygen-flask combustion

A method is described which allows the determination of uranium in organic complexes following decomposition by the oxygen-flask procedure. Uranium is quantitatively determined by a direct titration with 0.01 M pyridine-2,6-dicarboxylic acid, arsenazo I being used as the indicator. The end-point is sharp and the equilibrium is rapidly attained, so the titration can be carried out rapidly. The method is simple, rapid and highly reproducible.

Iodimetric determination of milligram amounts of certain aliphatic acids

Iodimetric determination of milligram amounts of certain aliphatic acids

Determination of milligram amounts of thiourea, allylthiourea and phenylurea using bromine monochloride in water-acetic acid medium

Determination of milligram amounts of thiourea, allylthiourea and phenylurea using bromine monochloride in water-acetic acid medium

Spectrophotometric Determination of Trivalent Manganese in the Presence of Divalent Iron with Possible Application to the Analysis of Manganese Bearing Ferrospinels

A spectrophotometric method for the determination of milligram amounts of trivalent manganese in the presence of divalent iron, trivalent iron, and divalent manganese is described. Powdered samples...

Thermometric assay of some aldoses

A method is proposed for the determination of milligram amounts of some aldohexoses and aldopentoses. After oxidation using an excess of periodate in acidic solution, the unreacted periodate is determined thermometrically by titration with mannitol, which gives reaction products which cannot react with those already produced. This removes the possibility of errors caused by interaction of the products of the oxidation reaction and the assay reaction. The method gives results as acceptable as those obtained by the Malaprade method, in a shorter time and with better sensitivity, and can be used in industrial samples where methods involving visual detection of the end point cannot be used.

Determination of milligram amounts of thiourea and some of its derivatives with N-bromosuccinimide

N-Bromosuccinimide oxidises aqueous solutions of thiourea and some of its derivatives readily and quantitatively. The reaction takes place at room temperature and N-bromosuccinimide is reduced to succinimide. A titrimetric method for the determination of thiourea, phenylthiourea and allylthiourea with standard N-bromosuccinimide solution is described. The experimental error does not exceed ±1·0 per cent. of the theoretical value.

Milligram determination of aromatic amines and phenols with N-bromosuccinimide

A simple and rapid method has been developed for the determination of milligram amounts of aromatic amines and phenols. An aliquot containing 2–4 mg of sample is dissolved in a mixture of hydrochloric and acetic acids and allowed to react with N-bromo-succinimide, the excess of which is determined iodometrically after the reaction is over. The reaction time varies from 1–10 min and the absolute error generally is negative, ranging from −1 to −4%.

Determination of vanadium with hexamminecobalt(III) chloride

Precipitation reactions of meta-, hexa-, and pyrovanadates with hexamminecobalt(III) chloride were studied in detail to find the optimum conditions for the gravimetric and radiometric determination of vanadium.Recommended procedures for both gravimetric and radiometric analysis of vanadium are as follows. Neutral or acidic sample solution containing 530 mg of vanadium is adjusted to pH 13 by adding sodium hydroxide solution. After allowing to stand for 30 minutes, the excess reagent solution is added to the sample solution. The precipitate obtained is filtered and washed. The weight of the precipitate is measured after drying at 110°C. Radiometric determination is done under the same conditions but on microscale using radioactive cobalt compound.The gravimetric method is applicable to the determination of milligram amounts of vanadium, while the radiometric method is useful for microgram amounts of vanadium.

An examination of some of the factors affecting the determination of carbon dioxide by non-aqueous titrimetry

Some of the factors, including choice of absorbent, indicator and titrant, that affect the determination of carbon dioxide by non-aqueous titrimetry are examined experimentally. The results of this examination are used to give a procedure that is recommended for the determination of milligram amounts of carbon dioxide.The method involves absorption of the carbon dioxide in a 5 per cent. v/v solution of ethanolamine in formdimethylamide, followed by titration with standard tetrabutyl ammonium hydroxide in benzene-methanol solution to a visual end-point with thymolphthalein indicator.

Iodimetric Determination of Milligram Amounts of Rubber Hydrocarbon

Abstract An iodimetric method is described for determining rubber hydrocarbon; it is based on the bromination of the rubber molecule, and is sensitive to 2 mg of rubber dissolved in benzene. By comparing it with a standard procedure, it has been shown that the proposed method will determine accurately the rubber hydrocarbon content of field latex. The precision with which solutions of pure rubber in benzene can be determined by the method corresponds to a coefficient of variation of about 0.5 per cent and rubber hydrocarbon in latex can be determined with a precision of about 1.5 per cent.

HIGH-FREQUENCY TITRATIONS: I. ARGENTIMETRIC DETERMINATION OF HALIDES AND THIOCYANATE IN METHANOL

A new method is proposed for the determination of milligram amounts of each halide present in a mixture of alkali-metal halides. In some mixtures, thiocyanate also may be determined. A methanol solution of the sample is titrated in a closed-type cell, with a standard solution of silver nitrate in methanol. By using high-frequency titrimetry, and an appropriate concentration of the halide solution, sharp end points were obtained for each halide. Because of solid solutions, the accuracy of the determination of individual halides in mixtures depended on the mole ratios of the halides; the errors found in the titration of various binary, ternary, and quaternary mixtures are reported. For some binary mixtures, the total amount of halide titrated in 120 ml of methanol was varied from 0.5 to 500 micromoles. At the lower concentrations, addition of a small amount of sodium nitrate sharpened the end point. At all concentrations of halide, an excessive amount of indifferent electrolyte essentially eliminated the end points. The alkali-metal halides gave more satisfactory titration graphs than did some other metal halides. The effects of variation in temperature, and of solvent evaporation were noted.

Iodimetric determination of milligram amounts of rubber hydrocarbon

Abstract An iodimetric method is described for determining rubber hydrocarbon; it is based on the bromination of the rubber molecule, and is sensitive to 2 mg of rubber dissolved in benzene. By comparing it with a standard procedure, it has been shown that the proposed method will determine accurately the rubber hydrocarbon content of field latex. The precision with which solutions of pure rubber in benzene can be determined by the method corresponds to a coefficient of variation of about 0.5 per cent and rubber hydrocarbon in latex can be determined with a precision of about 1.5 per cent.