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本文所述方法先用有机溶剂萃取分离出钼砷杂多酸,再反萃入水相,然后测定其中的钼量以间接测定砷。1 分析方法取As(V)标准液(0.01μg·ml~(-1))0～12μg于125ml分液漏斗中,加水稀至约15ml,加HNO_32ml,加钼酸铵(5%)5ml,摇匀,放10min。加正丁醇:乙酸乙酯(1:1)10ml,萃取1min,弃去水相后,用水5ml洗有机相2次,每次30s。加NaOH(1mol·L~(-1))5ml反萃1min,将水相放入25ml比色管中,弃去有机相。用H_2SO_4(1+
In the method described herein, the molybdenum arsenic heteropolyacid is first extracted with an organic solvent and then back extracted into the aqueous phase, and then the amount of molybdenum therein is measured to indirectly determine arsenic. 1 Analysis method Take 0 ~ 12μg As (V) standard solution (0.01μg · ml -1) in a 125ml separatory funnel and dilute to about 15ml with water, add HNO_32ml, add 5ml of ammonium molybdate (5%), Shake well, put 10min. Add n-butanol: ethyl acetate (1: 1) 10ml, extraction 1min, discard the aqueous phase, wash the organic phase with water 5ml twice, each time 30s. Add NaOH (1mol·L ~ (-1)) 5ml stripping 1min, the aqueous phase into a 25ml colorimetric tube, the organic phase was discarded. With H_2SO_4 (1+