1-（4-安替比林）-3-（对苯磺酸）三氮烯光度法测定废水中镉(Ⅱ)

探讨了1-（4-安替比林）-3-（对苯磺酸）三氮烯(ASTA)与镉的反应，建立了直接测定废水中镉的光度分析方法。试验表明，在硼砂－氢氧化钠介质中，镉与ASTA形成1∶2的红色络合物，该络合物的最大吸收峰位于505 nm，表观摩尔吸光系数为2.7×10⁵ L·mol^-1·cm^-1。10 mL溶液中，镉量在0.3～5.0 μg之间符合比尔定律，检出限为0.1 mg/L。方法已用于电镀废水样中镉的测定，结果与原子吸收光谱法相一致，方法的回收率在104%～105%之间，相对标准偏差(n=6)小于3.9%。

Spectrophotometric determination of cadmium in wastewater with 1-(4-antipyrine)-3-(sulfanilic acid)-triazene

The reaction of 1-(4-antipyrine)-3-(sulfanilic acid)-triazene(ASTA) with cadmium was studied to establish a direct photometric determination of cadmium in wastewater.The results showed that in the mixed medium of Na2B4O7-NaOH, cadmium reacted with ASTA to form a 1∶2 red complex．The complex had maximum absorption at 505 nm with the apparent molar absorptivity of 2.7×10⁵ L·mol^-1·cm^-1. 0.3-5.0 μg of Cd(Ⅱ) obeyed Beer's law in 10 mL of solution and the detection limit was 0.1 mg/L.This method had been applied to the determination of cadmium in wastewater samples, whose results were in consistency obtained by AAS method. Recovery was in the range of 104%-105% and the RSD (n=6) was lower than 3.9%.