Spectrophotometric Determination Of Platinum Research Articles

Extractive Spectrophotometric Determination of Platinum in Cisplatin Injection, Alloys and Catalysts Assisted by 2-nitrobenzaldehydethiocarbohydrazone

A simple, rapid, selective and sensitive spectrophotometric method for the determination of platinum(IV) was developed, based on the color reaction between platinum(IV) and 2nitrobenzaldehydethiocarbohydrazone (2-NBATCH) in the pH range 6.4-7.8. The red colored species have been developed after heating the reaction mixture in boiling water bath for 5 min and it was extracted into chloroform. The complex has an absorption maximum at 440 nm. A 20 fold of excess of reagent was required for complete complex formation. Beer’s law was obeyed for platinum(IV) concentration in the range of 4-12 µg mL-1 and the optimum concentration range was 6-12 µg mL-1 of platinum(IV) as evaluated by Ringbom’s plot. The molar absorptivity and Sandell’s sensitivity were 1.03  104 L mol-1 cm-1 and 0.0189 µg cm-2, respectively. The effect of pH, heating and extraction time, concentration of reagent and interference from various ions were investigated. The stoichiometry of the extracted complex was determined by Job’s method of continuous variation, mole ratio method and slope ratio method. It was found that metal to ligand ratio was 1:2. The developed method has been successfully applied to the determination of platinum(IV) in pharmaceutical samples, catalyst and synthetic alloy sample.

Synthesis, characterization of carbon polyurethane powder and its application for separation and spectrophotometric determination of platinum in pharmaceutical and ore samples

A new chelating sorbent was synthesized by covalently linking carbon nano-fiber with ion exchange polyurethane foam (CNF-PUFIX). CNF-PUFIX was characterized using different tools e.g. elemental analysis, IR spectrum and SEM. The functional groups of PUF have disappeared. The phenolic, carboxylic, quaternary ammonium salt and tertiary amine groups are detected in the CNF-PUFIX. The sorption properties of platinum (IV) onto CNF-PUFIX were investigated, the maximum sorption of platinum ions (~100%) was at the pH ranges 4-5, shaking for 18 min and sample flow rate 1.3 mL min(-1). The experimental data was fitted by kinetic models, the pseudo-second order is predominant (R(2)=0.998), the values of h and k2 are 4.4 mmol g(-1)min(-1) and 0.15 g mmol(-1)min(-1), respectively. The sorption capacity of CNF-PUFIX and the recovery percentage of Pt (IV) were 0.19 mmol g(-1) and 99-103%, respectively (RSD=1.72%, n=5). The CNF-PUFIX could be used many times without decreasing their capacities significantly. The equilibrium process is well described by the Langmuir isotherm model (R(2)=0.857), which is attributed to the homogeneous surface structure of the CNF-PUFIX. The values of ΔG and ΔH were -3.5 and -26.1 kJ mol(-1), respectively, which indicate that the sorption of platinum onto CNF-PUFIX is spontaneous and exothermic. The lower detection limit of platinum using spectrophotometric method is 2.4 µg L(-1) (RSD~3.8%, n=6). The accuracy of the procedure was verified by the analysis of standard reference materials of pharmaceutical and granite samples.

Spectrophotometric determination of platinum(IV) using anthranilic acid

A rapid and sensitive spectrophotometric method for the determination of Pt I V with anthranilic acid is described. Anthranilic acid reacts with Pt I V at pH 3.0 to give a pink coloured complex, which shows λ m a x at 372nm. Sandell's sensitivity and molar absorptivity of the complex are 5.6 × 10 - 3 μg cm - 2 and 3.41 × 10 4 dm 3 mol - 1 cm - 1 , respectively. The effect of foreign ion and other experimental variables are studied. Pt I V has been successfully determined in synthetic solutions.

Direct Spectrophotometric Determination of Platinum by Microwave-Oven Induced Flow-Injection Analysis

An on-line flow-injection-microwave oven system employed to accelerate chromogenic reactions is described. Effects of microwave on chromogenic reactions between Pt(II,IV) and 5-Br-PADAT in HOAc-NaOAc media are studied respectively, and a direct spectrophotometric flow-injection determination method for Pt(II) is established. The maximum absorption wavelength is 600nm for Pt(II), and 560nm for Pt(IV). This method is applied to the determination of platinum in fresh platinum catalyst with aluminum as support.

Spectrophotometric determination of platinum in glass after extraction with polyurethane foam

A spectrophotometric method has been developed for determination of trace amounts of platinum in glass. The method is based on the extraction of platinum(II) from 1 M hydrochloric acid containing 0.2 M stannous chloride and 4 × 10 −4 M dithizone onto polyurethane foam, elution with acetone (containing 3% v/v concentrated hydrochloric acid) and measurement of the absorbance of the eluate at 530 nm. Beer's law is obeyed up to 10.0 μg/ml Pt. The minimum platinum level in the eluate that can be determined by this method is 0.1 μg/ml.

Spectrophotometric determination of platinum in cordierite-supported platinum-tin dioxide catalysts

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectrophotometric determination of platinum in cordierite-supported platinum-tin dioxide catalystsHans Guenther LintzCite this: Ind. Eng. Chem. Res. 1991, 30, 8, 2012–2013Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://doi.org/10.1021/ie00056a052RIGHTS & PERMISSIONSArticle Views77Altmetric-Citations3LEARN 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 (290 KB) Get e-Alerts Get e-Alerts

Determination of platinum and iridium in reforming catalysts by second derivative and absorptiometric spectrophotometry

Investigations on the spectrophotometric determination of platinum as a complex formed by tin(II)chloride in hydrochloric acid are reported. The determination of platinum was found to be interfered with by iridium, because it also forms a complex with tin(II) chloride. The features of the derivative absorption spectrophotometry for the quantitative determination of platinum and iridium was also studied. The analytical application of the method for the determination of platinum and iridium in catalysts was investigated.

Extraction and Spectrophotometric Determination of Platinum using Mixed-ligand Complex Formation with Pyridine, α-Picoline, β-Picoline, ƴ-Picoline or 2,4,6-Collidine and Iodide

Extraction and Spectrophotometric Determination of Platinum using Mixed-ligand Complex Formation with Pyridine, α-Picoline, β-Picoline, ƴ-Picoline or 2,4,6-Collidine and Iodide

Spectrophotometric determination of platinum and palladium with 1,5-diphenylcarbazide

Spectrophotometric determination of platinum and palladium with 1,5-diphenylcarbazide

Spectrophotometric determination of platinum(IV) with potassium butyl xanthate

A simple, convenient and highly selective spectrophotometric method for the determination of platinum has been developed using potassium butyl xanthate. The optimum concentration range evaluated by Ringbom's method was found to be 4.87–9.75 ppm. The method of continuous variations and the molar ratio method confirmed a platinum to reagent ratio of 1 : 3 in the complex. The effect of pH, excess of reagent and foreign ions on the determination of platinum(IV) and the effect of time, temperature and the solubility of the complex with various solvents were studied.

Spectrophotometric determination of platinum after extraction of its phenanthraquinone monoximate into molten naphthalene

Platinum is determined spectrophotometrically after extraction of its phenanthraquinone monoximate into molten naphthalene in the pH range 2.8–4.1. Beer's law is obeyed in the concentration range 5.0–95.0 µg of platinum in 10 ml of chloroform solution at 425 nm. The molar absorptivity and Sandell's sensitivity are 1.755 × 104 l mol–1 cm–1 and 0.011 µg cm–2, respectively. Ten replicate analyses of a sample solution containing 50 µg of platinum gave a mean absorbance of 0.450 with a standard deviation of 0.0042 and a relative standard deviation of 0.93%. The interference from various ions has been studied and the method has been applied to the simultaneous determination of platinum and palladium in various synthetic mixtures.

Spectrophotometric determination of platinum with substituted pyrimidine-2-thiol

The yellow complex of Pt(IV) with 1-pyridyl-4,4,6-trimethyl-1H,4H-pyrimidine-2-thiol (PyTPT) which has maximum absorbance at 430 nm, is studied for the spectrophotometric determination of the metal. Molar absorptivity is 5000 liters mol −1 cm −1 and Sandell's sensitivity is 0.039 μg/cm 2. The determination of Pt(IV) (2.8–8.4 ppm) in the presence of diverse ions is described.

Spectrophotometric determination of platinum with iodide and Pyronine G

A sensitive and selective spectrophotometric procedure for the determination of platinum is described. The method is based on the interaction of Pyronine G with the hexaiodoplatinate(IV) anion to form a pink product that is stable for 24 h when stabilised with gelatin. Platinum concentrations as low as 0.02 p.p.m. can be readily determined. The method is precise and has been applied to the determination of platinum in synthetic alloys and mineral samples and palladium foil.

Application of methopromazine for the extractive spectrophotometric determination of platinum

Optimum conditions have been established for the formation and extraction of the complex of methopromazine with platinum(IV) in hydrochloric acid and an extractive spectrophotometric method for the determination of platinum is described.

Spectrophotometric determination of platinum (II) and palladium (II) with 4-(2-pyridylazo)-resorcinol by reversed phase ion-pair partition chromatography

白金(II)及びパラジウム(II)は,塩化物イオン共存下2-プロパノール-水混合溶媒中で4-(2-ピリジルアゾ)レソルシノール(PAR,H2par)と反応して,金属イオン:塩化物イオン:PAR;1:1:1の三元錯体を形成する.1価の陰イオン種[PtCl(par)-]及び[PdCl(par)-]は,テトラブチルアンモニウムイオンを対陽イオンとして,逆相イオン対分配高速液体クロマトグラフィーによる分離が可能である.これを利用して,PARによる白金(II)及びパラジウム(II)の同時定量法を確立した.本法により1×10-6moldm-3の白金(II)及び5×10-7moldm-3のパラジウム(II)が定量できた.1×10-5moldm-3の目的成分に対し,10-4moldm-3の鉄(II),コバルト(II),ニッケル(II),銅(II),亜鉛(II),アルミニウム(III),クロム(III)及びロジウム(III)の共存は許容された.

Extractive separation of platinum from macroamounts of palladium using triphenylphosphine oxide and its successive spectrophotometric determination by the stannous chloride method

Trialkylphosphine oxides extract more effectively chloride complexes of platinum than of palladium(II). Of the examined tributylphosphine (TBPO), trioctylphosphine (TOPO), and triphenylphosphine (TPPO) oxides the latter one makes possible best separation of these metals. The extraction of platinum with TPPO from solutions containing platinum and palladium unfavorably decreases with increasing palladium concentration. Using 0.1 M TPPO solution in dichloroethane, at HCl concentration 7.5 M, it is possible to separate 2–200 μg Pt/ml at a palladium concentration not higher than 10 mg/ml. Separation of platinum from macroamounts of palladium has been combined with spectrophotometric determination of platinum by means of stannous chloride. The method has been applied to the analysis of palladium for platinum content.

Extraction and spectrophotometric determination of platinum(IV) using tetramethylthiuram disulfide

The extraction and photometric determination of platinum(IV) with tetramethylthiuram disulphide has been studied. Addition of an excess of stannous chloride and maintaining acidity to 2–6 M with HCl is necessary for quantitative extraction. With 10 ml of TMTD in toluene and equilibration for 30 sec, platinum is extracted as a pale yellow complex in the organic phase. It has λ max at 348 nm and obeys Beer's law in the concentration range of 0.2 to 9.0 μg of Pt per ml. The complex is stable for 3 hr. The ratio of Pt:TMTD in the extracted species is found to be 1:1. Most of the anions and cations are tolerated in large ratio. The method can be satisfactorily applied for the determination of platinum in the presence of four- and eightfold excesses of ruthenium and osmium, respectively.

Spectrophotometric determination of platinum(IV) Using dithio-oxamide as a reagent

Spectrophotometric determination of platinum(IV) Using dithio-oxamide as a reagent

Extraction and spectrophotometric determination of platinum(IV) with thiobenzhydrazide

Extraction and spectrophotometric determination of platinum(IV) with thiobenzhydrazide

Simple trace determination of platinum in geological materials

Abstract A direct, sensitive and simple method for the determination of sub-microgram amounts of platinum in acid leachates from geological materials is described. The sample is sized to plus 80-mesh and roasted at 700°C. During this operation the most important interfering elements such as C, S, Hg, Se, Te and As are eliminated. Anions and small amounts of most cations found in strongly acid leachates from rock samples do not interfere. Hydrogen peroxide is used as the oxidant during leaching with 5–7 M HCI. Platinum is reacted with Sn 2+ after filtration. Addition of Rhodamine 6G precipitates a red quaternary complex. The colloidal suspension is suitable for spectrophotometric determination of platinum. While the reagent absorbance at 530 nm decreases, a peak due to the colloid appears at 565 nm. Beer's law is obeyed up to 0.6 absorbance unit, which corresponds to about 1.7 μg/ml of Pt. The sensitivity (3 times the noise level) corresponds to 0.01 μg/ml of Pt. A test procedure is described for serial analysis of 1–3-g powdered samples which enables an operator to perform from 30 to 50 analyses per man-day in the concentration range of 0.1–17 ppm of platinum. The procedure has been validated against standard samples and a recovery of 90% has been obtained with unspiked samples.