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原子吸收分光光度法测定铬,已被广泛应用于矿石分析。为简化手续,提高准确度,本文针对空气-乙炔焰,揭示了硫-磷混合酸分解矿样,并以此为介质直接测定,代替了碱熔或酸溶焦硫酸钾回渣。发现该介质中镁、铝不干扰测定,铁、硅等在抑制剂硫酸钠存在下,均不影响铬的测定。分析灵敏度0.1ppm/1％三氧化二铬((?)0.068ppm/1％Cr),可适用于铁矿、多金属矿、铝土矿、钒钛磁铁矿、硅酸盐等矿石中0.01～1％Cr的测定,扩展标尺可测至0.00x％的铬。方法简便,重现性较好,可获得满意的结果。
Determination of chromium by atomic absorption spectrophotometry has been widely used in ore analysis. In order to simplify the procedure and improve the accuracy, this paper, for the air - acetylene flame, reveals the sulfur - phosphorus mixed acid decomposition of ore samples, and as a direct determination of the medium, instead of the alkali melt or acid-soluble potassium sulfate back to slag. Found in the medium of magnesium, aluminum does not interfere with the determination of iron, silicon and other inhibitors in the presence of sodium sulfate, did not affect the determination of chromium. Analysis sensitivity 0.1ppm / 1% chromium oxide ((?) 0.068ppm / 1% Cr), applicable to iron ore, polymetallic ore, bauxite, vanadium titanomagnetite, silicate and other ore 0.01 ~ 1% Cr determination, the expansion scale can be measured to 0.00x% of chromium. The method is simple, reproducible, and satisfactory results are obtained.