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用7215型全差示光度计,以偶氮胂Ⅲ为显色剂测定了岩矿中痕量钍。该法灵敏度高、选择性佳,可准确测定岩矿中n×10~(-4)％—n×10~(-1)％的钍。
Determination of trace amounts of thorium in rock ores with arsenazo Ⅲ as chromogenic reagent was performed with a 7215 - type differential spectrophotometer. The method has high sensitivity and good selectivity and can accurately determine thorium with n × 10 -4% - n × 10 -1% in rock and mine.