イオウ中のヒ素,アンチモンおよびテルルの分光分析

概要

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Trace element, especially arsenic, in free sulfur has a serious effect upon the characteristics of the products. The amounts of the trace element are conventionally determined by chemical methods including the ashing procedure and the wet oxidation decomposition, which are time consuming and troublesome as routine works in the quality control. A spectrochemical method has been presented by the author for the determination of arsenic, antimony and tellurium in native sulfur without chemical separation by direct current arc with an auxiliary boiler-cap graphite electrode.<BR>Prior to the arcing, sulfur powder is mixed with an equal amount of graphite powder containing 14.4% germanium dioxide as an internal standard.<BR>The excitation conditions are as follows: arc current 5 A at D. C. 315 V and 25 seconds exposure.The line pairs of As I 2349. 84/Ge I 2327. 90, Sb I 2311. 47/Ge I 2314. 20 and Te I 2385. 76, Ge I 2379. 14 are used.<BR>The lower determination limit is 1 ppm for arsenic, antimony and tellurium. The standard deviation in this method was below 12 percent.
社団法人日本分析化学会の論文