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钼蓝光度法测定砷,由于硅、磷等干扰,故常以苯等有机溶剂萃取分离AsI_3后再显色测定。本工作采用碘液吸收氢化砷分离,再用硝酸除尽碘,然后以钼盐光度法进行砷的测定。As_2O_3浓度在0～5.0μg ml~(-1)范围内呈良好的线性关系,检出下限0.05μg ml~(-1),变动系数3.0%。测定矿石中10~(-4)～10~(-1)%As,获得了满意的结果。实验部分一仪器与试剂岛津UV-3000分光光度计;72型分光光度计。碘吸收溶液和砷标准溶液的配制同文献。钼酸铵溶液:4×10~(-3);硫酸溶液:0.72N。二试样分析称取0.1000g试样于50ml烧杯中。溶矿及发生
Determination of arsenic molybdenum blue photometry, due to interference of silicon, phosphorus and other often used benzene and other organic solvent extraction and separation AsI_3 determination of color. This work uses iodine to absorb arsenic hydride separation, and then remove the nitric acid, iodine, and then molybdenum salt photometry arsenic determination. The concentration of As_2O_3 showed a good linearity in the range of 0 ~ 5.0 μg ml -1 with the detection limit of 0.05 μg ml -1 with a coefficient of variation of 3.0%. Determination of ore 10 ~ (-4) ~ 10 ~ (-1)% As, obtained satisfactory results. Experimental part of an instrument and reagents Shimadzu UV-3000 spectrophotometer; 72 spectrophotometer. Preparation of iodine absorption solution and arsenic standard solution with the literature. Ammonium molybdate solution: 4 × 10 ~ (-3); sulfuric acid solution: 0.72N. Two sample analysis Weigh 0.1000g sample in a 50ml beaker. Dissolved ore and occurs