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本文研究了砷与二硫代安替比林甲烷(简称DTPM)的显色反应条件,並拟定了岩石矿样中砷的测定方法。在10—12％盐酸介质中砷与与DTPM形成的络合物具有紫外吸收,λ_(max)=330nm,络合物组成为1:2,ε=2.42×10~4l·mol~(-1)·cm~(-1)。砷在0—40μg/25ml范围内符合比耳定律。在盐酸羟胺、六偏磷酸钠等掩蔽剂存在下可不经分离直接测定矿样中的砷。标样验证结果,精密度优于±5％,加入法回收率为99.5～105％。 岩石矿物中砷的测定有砷钼杂多黄法、砷钼杂多酸—结晶紫法、砷(Ⅲ)—二乙氨基二硫代胺基甲酸银法、砷锑钼黄法等,但这些方法均需采用不同
In this paper, the color reaction conditions of arsenic and antipyrine dithioethane (DTPM) were studied, and the determination method of arsenic in rock samples was developed. The complex of arsenic and DTPM has a UV absorbance in the range of 10-12% hydrochloric acid, λ max = 330nm, the complex composition is 1: 2, ε = 2.42 × 10 ~ 4l · mol -1 ) · Cm -1. Beer’s law is in line with arsenic in the range of 0-40 μg / 25 ml. In the presence of hydroxylamine hydrochloride, sodium hexametaphosphate and other masking agents can be directly measured without isolation of arsenic samples. Standard sample validation results, precision better than ± 5%, adding France recovery rate of 99.5 to 105%. Determination of arsenic in rock minerals are arsenic molybdenum heteropoly yellow method, arsenic molybdenum heteropoly acid - crystal violet method, arsenic (Ⅲ) - diethylamino dithiocarbamate silver method, arsenic antimony molybdenum yellow method, etc., but these Methods need to be different