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本文针对地质样品中的微量锡,汇集了氢化物、石墨炉二种方法的优点,对仪器及操作作了改进,将发生的气相氢化物通过干燥,用液氮冷凝使之富集,最后导入石墨炉原子化,从而使原子吸收分光光度法测定锡的灵敏度有很大的提高。分析方法的检出限为0.035ppm灵敏度为0.024ng/ml/1％。可分析含2×10~(-5)—3×10~(-3)％锡的样品。 一、仪器及装置 1.仪器P—E420型原子吸收分光光度 计
In this paper, for the trace tin in geological samples, the merits of the two methods of hydride and graphite furnace are summarized, and the instruments and operations are improved. The resulting gaseous hydride is dried, enriched by liquid nitrogen condensation and finally introduced Graphite furnace atomization, so that the atomic absorption spectrophotometric determination of tin sensitivity has greatly improved. The analytical limit of detection was 0.035 ppm with a sensitivity of 0.024 ng / ml / 1%. Samples containing 2 x 10 ~ (-5) -3 x 10 ~ (-3)% tin can be analyzed. First, instruments and devices 1. Instruments P-E420 atomic absorption spectrophotometer