Toshimi Yamamoto

Determination of microamounts of lead in copper, nickel and aluminium metals and in copper-base alloys by solvent extraction and atomic absorption spectrometry

Abstract A rapid and sensitive method has been developed for the determination of microamounts of lead in copper, nickel and aluminium metals, and copper-base alloys. Optimal conditions have been established for the extraction and determination of lead. Lead is extracted with a methyl isobutyl ketone solution of methylbenzyllauryloctylammonium bromide and determined by atomic absorption spectrometry. As little as 0.5 p.p.m. of lead in copper, nickel and aluminium metals, and 5 p.p.m. of lead in copper-base alloys can be determined.

Determination of tellurium in copper, lead and selenium by atomic-absorption spectrometry after extraction of the trioctylmethylammonium—tellurium bromide complex

A simple, rapid and sensitive combined solvent extraction and atomic-absorption spectrometric method has been developed for the determination of tellurium in copper, lead, selenium and blister copper. Tellurium is extracted as the trioctylmethylammonium-tellurium(IV) bromide complex into butyl acetate and determined by flame atomic-absorption spectrometry of the extract. As little as 1 mug of tellurium in a sample can be determined. The extraction of tellurium from hydrobromic acid solution with trioctylamine has also been investigated.

Extraction—spectrophotometric determination of traces of thallium in lead, cadmium, indium and zinc metals with tri-n-octylamine

Abstract A sensitive spectrophotometric method is described for the determination of thallium in lead, cadmium, indium and zinc metals. Optimal conditions have been established for the extraction and determination of thallium. Thallium is extracted as its bromo complex with tri-n-octylamine and then converted to an iodo complex, the absorbance of which is measured at 400 nm. As little as 1 p.p.m. of thallium in lead, cadmium and zinc metals, and 2 p.p.m. of thallium in indium metal can be determined.

Determination of tin in copper, lead, nickel, selenium and aluminium metals and in copper and lead alloys by flame atomic absorption spectrometry after extraction of trioctylmethylammonium hexachlorostannate(IV)

Summary A simple, rapid and sensitive method combining solvent extraction and atomic absorption spectrometry is reported for the determination of tin in copper, lead, nickel, selenium and aluminium metals, and in copper and lead alloys. After sample dissolution with mineral acids, tin is extracted as the trioctylmethylammonium hexachlorostannate(IV) ion-pair into butyl acetate and determined by direct nebulization of the extract into a nitrous oxide—acetylene flame. As little as 2 μg of tin in a sample can be determined. Extractions with trioctylamine and from bromide media are also reported.

Coulometric argentometric determination of microamounts of sulphur in iron and steel after reduction to hydrogen sulphide with iron(II) in strong phosphoric acid medium

Abstract A coulometric method was developed for the determination of microamounts of sulphur in iron and steel. Hydrogen sulphide is quantitatively evolved by reduction with iron(II) in strong phosphoric acid medium and is titrated with electrolytically generated silver ion from a silver anode. Microamounts of sulphide (2.96–224.3 μg) in sodium sulphide standard solutions could be determined with an error of only a few percent. Sulphur in a potassium sulphate standard solution is quantitatively reduced to hydrogen sulphide and could be separated from the solution by heating and determined accurately. Trace amounts of sulphur (7–100 μg g−1) in iron and steels could be determined with a standard deviation of 0.7–2.1 μg g−1.

Extraction-spectrophotometric determination of traces of bismuth in lead, copper and nickel metals, and in copper-base alloys with tri-n-octylamine

Abstract A rapid and sensitive spectrophotometric method has been developed for the determination of bismuth in lead, copper and nickel metals, and in copper-base alloys. Optimal conditions have been established for the extraction and determination of bismuth. Bismuth is extracted with a benzene solution of tri-n-octylamine in the presence of hydrobromic acid and the absorbance of the extract (bromo-complex of bismuth) at 380 nm is measured. As little as 0.5 p.p.m. of bismuth in these metals and alloys can be determined.

アルセナゾIIIによる銅-イットリウム,ニッケル-クロム合金中のイットリウムの吸光光度定量

アルセナゾIIIによる銅-イットリウム,ニッケル-クコム合金中のイットリウムの吸光光度法を提出した.試料を硝酸または過塩素酸に溶解後,その一部をとり,40mg以上の銅およびニッケル,クロムが共存する場合には,イットリウムをTTAで抽出分離することにより,また銅が40mg以下のときには,チオ尿素で銅をいんぺいすることにより,これら共存元素の妨害を除去したのち,pH2.5において660mμの吸光度を測定し,検量線よりイットリウムの含有量を求める.イットリウムとアルセナゾIIIの錯体は最終溶液について0～1ppmの範囲でベールの法則に従い,その定量感度は最終溶液について0.1ppmである.