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Ag—DDTC法广泛用于水及底泥中砷的测定。但该法在有机相显色,有机溶剂氯仿毒性大,污染环境,危害人体健康。此外该法灵敏度(ε=1.2×10~4)也不能满足10ppb以下砷的测定。近年来有人用砷钼兰—孔雀绿水相分光光度测定矿石中微量砷,摩尔吸光系数比Ag—DDTC法有所提高(ε=7.5×10~4)。A.K.等人曾提出用丙酮溶解砷钼酸—结晶紫色淀测定砷的可能性,但重现性差,要用环已酮—甲苯混合溶剂从过剩试剂
Ag-DDTC method is widely used in the determination of arsenic in water and sediment. However, the method in the organic phase color, chloroform toxicity of organic solvents, pollute the environment, endanger human health. In addition, the method sensitivity (ε = 1.2 × 10 ~ 4) also can not meet the 10ppb arsenic determination. In recent years, arsenic Molan - malachite green aqueous phase spectrophotometric determination of arsenic in the ore, the molar absorption coefficient than the Ag-DDTC method has increased (ε = 7.5 × 10 ~ 4). A.K. et al. Proposed the possibility of using acetone to dissolve arsenomolybdate-crystal purple lake for determination of arsenic, but with poor reproducibility, it is necessary to use cyclohexanone-toluene mixed solvent from excess reagent