Iwao Tsukahara

Determination of gold in silver, copper, lead, selenium and anode slime by atomic-absorption spectrometry.

A simple and sensitive combined solvent-extraction and atomic-absorption spectrometric method has been developed for the determination of gold in silver, copper, lead, selenium and anode slime. Samples are decomposed with hydrochloric and nitric acids, and gold is extracted as the trioctylmethylammonium-gold bromide complex and determined by atomic-absorption spectrometry by direct spraying of the extract into the flame. Optimal conditions for the extraction and determination of gold have been established. As little as 0.5 mug of gold in a sample can be determined. The extraction of gold from hydrochloric or hydrobromic acid solution with trioctylamine or trioctylmethylammonium chloride (or bromide) has also been investigated.

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 silver in copper and lead metals and alloys and in zinc and selenium by atomic-absorption spectrometry after separation by extraction of the tri-n-octylmethylammonium—silver bromide complex

A simple and sensitive combined solvent extraction and atomic-absorption spectrometric method has been developed for the determination of silver in copper and lead metals and alloys and in zinc and selenium. Optimal conditions have been established for the extraction and determination of silver. Silver is extracted as the tri-n-octylmethylammonium-silver bromide complex and determined by atomic-absorption spectrometry by spraying the extract directly into the flame. As little as 0.2 mug of silver in a sample can be determined.

Determination of palladium in silver, copper, selenium and anode sludge by atomic-absorption spectrometry after extraction of tri-n-octylmethylammonium tetrabromopalladate

Abstract Palladium (>0.5 μg ) is extracted as tri-n-octylmethylammonium tetrabromopalladate into n-butyl acetate and determined by flame atomic-absorption spectrometry of the extract. Extraction from hydrochloric or hydrobromic acid solution with tri-n-octylamine is also discussed. The method is applied to the determination of palladium in silver, copper, selenium and anode sludge.

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.

Extraction-spectrophotometric determination of traces of antimony in copper and lead metals and in lead-base alloy with pyrocatechol violet and tri-n-octylamine

Abstract A sensitive spectrophotometric method is described for the determination of antimony in copper and lead metals and in lead-base alloy. Optimal conditions have been established for the extraction and determination of antimony. Antimony (III) is extracted from a potassium iodide—sulfuric acid or a hydrobromic—sulfuric acid medium with toluene and converted to an antimony-pyrocatechol violet (PV) complex. The complex is then extracted with tri-n-octylamine (TOA) and the absorbance of the resulting ternary Sb(III)—PV-TOA complex is measured at 555 nm. As little as 0.5 p.p.m. of antimony in copper metal and 0.2 p.p.m. of antimony in lead metal and lead-base alloy can be determined.

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.

Determination of aluminum oxide in internally oxidized Cu-Al alloy

臭素メタノール法および酸分解法による内部酸化した銅-アルミニウム合金中の酸化アルミニウムの定量法を確立した.酸化アルミニウムを両法により合金マトリックスより抽出分離する際の最適条件を知るため,実験室的に合成した酸化アルミニウムおよび内部酸化した実際の銅-アルミニウム合金を用いて,酸化アルミニウムの溶解性に及ぼす分解温度,分解時間,メタノール中の水分などの影響を調べた.内部酸化した銅-アルミニウム合金中の酸化アルミニウムは,合成酸化アルミニウムに比較して非常に安定であり,臭素メタノール法,あるいは酸分解法のいずれによっても定量が可能であり,よく一致した結果が得られることがわかった.