Accurate Determination of Gallium in South African Primary and Secondary Reference Samples by Ion Exchange Chromatography and Atomic Absorption Spectrometry

Results are presented for gallium in six South African primary rock standards (NIMROCS) and in twelve secondary rock standards (SAROCS). A selective ion exchange procedure is used to separate gallium completely from all other elements, except remaining traces of thorium. It is followed by a determination of gallium with flame atomic absorption spectrometry using the nitrous oxide-acetylene flame, after the addition of 2000 ppm lanthanum as ionization suppressor.     

Determination of Cobalt in South African Primary and Secondary Reference Samples by Ion Exchange Chromatography and electrothermal Atomic Absorption Spectrophotometry

Results are presented for the determination of trace quantities of cobalt in three South African primary rock standards and in four secondary rock standards. Cohalt is separated from all other elements using a selective ion exchange separation procedure and determined by electrothermal atomic absorption spectrophotometry.     

Accurate Determination of Copper in South African Primary and Secondary Reference Samples by Cation Exchange Chromatography and Atomic Absorption Spectrometry

Copper in S.A. primary (NIMROCS) and in six secondary reference samples has accurately been determined by means of atomic absorption spectrometry. A selective ion exchange separation procedure, using a 20 g column of AG50W-X8 cation exchange resin and 0.2 M hydrochloric acid and 0.5 M hydrobromic acid, both containing 85% acetone, is employed for the separation of copper from all other elements, except vanadium. Vanadium which can partially accompany copper, however, is separated at the start of the sorption step with 0.01 M nitric acid-0.15% hydrogen peroxide. Accuracy and precision of the described method are demonstrated by the analysis of synthetic rock solutions containing various amounts of copper. Amounts of 10 and 100 μg of copper can be determined with a coefficient of variation of 0.3% and 0.2%, respectively.     

Accurate Determination of Cobalt in South African Primary and Secondary Geochemical Reference Materials by Cation Exchange Chromatography and Atomic Absorption Spectrometry

Cobalt in the six S.A. primary (NIMROCS) and fourteen secondary reference samples as well as in a phosphate rock has been determined accurately by means of atomic absorption spectrometry. A selective and quantitative ion exchange separation procedure, using a 20 g column of AG50W-X8 cation exchange resin and 0.4 M hydrochloric acid-86% acetone and 1 M hydrochloric acid-80% acetone as eluting agents, is employed for the separation of cobalt from all other elements. The accuracy and precision of the described method are demonstrated by the analysis of synthetic rock solutions containing various amounts of cobalt. Amounts of 1, 10 and 100 μg of cobalt can be determined with a coefficient of variation of 1%, 0.3% and 0.2%. respectively.     

Accurate Determination of Nickel in South African Primary and Secondary Geochemical Reference Materials by Cation Exchange Chromatography and Atomic Absorption Spectrometry

Nickel in the six SA primary (NIMROCS) and fourteen secondary reference materials as well as in a phosphate rock has been determined accurately by means of atomic absorption spectrometry. A selective and quantitative twocolumn ion exchange separation procedure, using AG50W-X4 cation exchange resin, is employed for the separation of nickel from all other elements. The accuracy and precision of the described method are demonstrated by the analysis of synthetic rock solutions containing various amounts of nickel.     

Determination of Arsenic and Antimony in Eighty-Five Geochemical Reference Samples by Automated Hydride Generation and Electrothermal Atomic Absorption Spectrometry

The arsenic and antimony contents of 85 geochemical reference samples have been determined by atomic absorption spectrometry with hydride generation and heated quartz cell atomizer. The sample is decomposed with a mixture of perchloric, nitric and hydrofluoric acids and potassium permanganate solution; interferences are eliminated by addition of potassium iodide, aluminium chloride and ascorbic acid. The agreement between the present results and published data is fairly good.     

Determination of Thallium in Eighty-Seven Geochemical Reference Samples by Atomic Absorption Spectrometry

The thallium content of eighty-seven geochemical reference samples has been determined by atomic absorption spectrometry using an air-acetylene flame or a graphite furnace atomizer, after extraction of thallium as chloride with methylisobutylketone (MIBK). A comparison with published data show clearly the need for much more data on most reference samples.     

Determination of Silver in Seventy-Three Geochemical Reference Samples by Atomic Absorption Spectrometry

The silver content of seventy-three geochemical reference samples has been determined by atomic absorption spectrometry using an air-acetylene flame or a graphite furnace atomizer, after extraction of silver as iodide with methyl isobutyl ketone (MIBK). A comparison with published data shows clearly the need for much more data on most reference samples.     

Determination of Beryllium in Eighty Geological Reference Samples by Atomic Absorption Spectrometry

The beryllium content of eighty geological reference samples has been determined by atomic absorption spectrometry using a nitrous oxide-acetylene flame or a carbon tube atomizer, after extraction of beryllium as acetylacetonate with methylisobutylketone (MIBK). The agreement between the present results and published data is generally good.     

Determination of Bismuth in Eighty-Three Geochemical Reference Samples by Atomic Absorption Spectrometry

The bismuth content of eighty-three geochemical reference samples has been determined by atomic absorption spectrometry using either a hydride generation and heated quartz cell atomizer or a solvent extraction and carbon tube atomizer. The agreement between the present results and published data is generally good.     

Determination of Gold in Sixty Geochemical Reference Samples by Flameless Atomic Absorption Spectrometry

The gold content of sixty geochemical reference samples has been determined by atomic absorption spectrometry using a graphite furnace atomizer after digestion of sample with aqua regia and extraction of gold as chloride by methylisobutylketone. A comparison with published data shows clearly the need for much more data on most samples before consensus values could be assigned.
La teneur en or dans soixante échantillons géochimiques de référence a été déterminée par le spectromètre d'absorption atomique équipé d'un four à graphite. L'échantillon a été mis en solution avec de l'eau régale et l'or extrait avec du methylisobutylketone. Un examen des données publiées sur l'or montre qu'il faut davantage de résultats pour fixer des valeurs de consensus dans la plupart des échantillons.     

Determination of Gold in Twenty Geochemical Reference Samples by Flameless Atomic Absorption Spectrometry

After acid digestion, gold is extracted with MIBK and determinated by flameless atomic absorption spectrometry. The results for six USGS reference samples and fourteen French geochemical standards are presented and discussed. The agreement with working values for these standards is in the range of pm 5%.     

Determination of Cadmium and Lead in Seventy-seven Geological Reference Samples by Atomic Absorption Spectrometry

The cadmium and lead contents of seventy-seven geological reference samples have been determined by atomic absorption spectrometry using an air-acetylene flame or a carbon tube atomizer, after extraction of cadmium and lead as iodides with methylisobutylketone (MIBK). The agreement between the present results and published data is generally good.     

Flameless Atomic Absorption Determination of Gold and Palladium in Geological Reference Samples

Gold and palladium have been determined in 42 geological reference samples with graphite furnace AAS after aqua regia digestion and SnCl₂-Hg extraction. A brief discussion on the quality of these analyses also is presented.     

Determination of Selenium in Geochemical Reference Samples Using Flameless Atomic Absorption Spectrometry

Sixteen international and six inter-laboratory geochemical reference samples have been analysed for their selenium content. No previous Sedata are available for thirteen of them. Selenium has been separated from silicate matrix by volatilization and was determined with flameless atomic absorption spectrometry. An outline of the procedure is given. The limit of detection is 10 ng Se per 1 g of sample. Time required for one full analysis is 1.2 to 2.5 hours depending on amount of sample to be volatilized.     

Determination of Platinum and Palladium in Sixty-Eight Geochemical Reference Samples by Flameless Atomic Absorption Spectrometry

Platinum and palladium contents of sixty-eight geochemical reference samples have been determined by graphite furnace atomic absorption spectrometry after digestion of sample with aqua regia and hydrofluoric acid and extraction of platinum and palladium as iodides by methylisobutylketone (MIBK). The data are compared with those from other studies and crustal abundances.     

在高氯酸—酒石酸—硫脲介质中原子吸收法测定多种矿石中的银

介绍了在ＨＣｌＯ４－酒石酸－硫脲混合介质中原子吸收测定Ａｇ的方法,避免了Ｃｕ、Ｓｂ、Ｗ等常见元素对Ａｇ的干扰,方法经ＭＧＩ系统金银地质标准参考样分析检验,结果与标准值相符,应用于含Ａｇ在１０＾－３～１０＾－６级的不同矿石中Ａｇ的测定,结果与王水介质中测Ａｇ的结果相符,对含Ａｇ１０＾－６水平的试样９次测定的ＲＳＤ〈５％。     

离子交换分离原子吸收法测定环境样品中Cr(Ⅲ)和Cr(Ⅵ)

采用717强碱性阴离子交换树脂吸附Cr(Ⅵ），抗坏血酸和H2SO4混合溶液作淋洗剂快速洗脱阴离子交换树脂上的Cr(Ⅵ），分离后Cr(Ⅲ）和Cr(Ⅵ)用原子吸收光谱法测定，Cr(Ⅲ)的回收率在92．10％－109．00％之间，Cr(Ⅵ)的回收率在96．00％－103．50％之间。     

Determination of Trace Amounts of Tin in Seventy-Three Geochemical Reference Samples by Atomic Absorption Spectrometry

The tin contents of 73 geochemical reference samples have been determined by atomic absorption spectrometry using an argon-hydrogen flame after extraction of tin (IV) as iodide with benzene. The agreement between the present results and published data is generally good.     

原子吸收分光光度法测定锌精矿中锌

选择Ｚｎ的非灵敏线,采用原子吸收分光光度法测定锌精矿中高含量锌。共存离子互不干扰,平均回收率为９９．８２％,对于锌精矿测定５次,其ＲＳＤ〈０．５％,该法所测结果与国家标准分析方法测定的结果相符,且较标准分析方法简便,快速,实用性强。