5-Br-PADAP、乳化剂OP分光光度法测定电镀废水中微量锌

Determination of trace zinc in metal plating wastewater by spectrophotometryusing the 5-Br-PADAP and the Emolsifier OP

本文探讨了利用 5 -Br-PADAP测定电镀废水中微量锌的显色条件。条件试验表明在pH值7 5～ 10 0硼酸 -硼酸钠缓冲溶液中 ,锌与 5 -Br -PADAP、乳化剂OP形成紫红色三元络合物 ,其λmax=5 5 2nm ,ε552 =1 3× 10 5L/ (mol cm) ,络合比为 1∶2 ,锌含量在 0～ 2 5 μg/ 5 0mL ,服从朗伯 -比尔定律。该方法应用于电镀废水中微量锌的测定具有灵敏度高 ,准确度好 ,操作简便安全、快速的特点。

This paper explores chromogenic conditions of determining trace zinc in metal plating wastewater by spectrophotometry using the 5-Br-PADAP and the emolsifier OP.The experiment indicates that the amaranthine three-element complex compound generated by zinc,5-Br-PADAP and emolsifier OP submits the Beer-Lambert law in the scope of 0～24μg/50mL under the condition of pH 7.5～10.0 of boracic acid-sodium borate buffer solution.The three-element complex compound's λ max =552nm,and ε 552 =1.3×105L/(mol.cm).Its complexing ratio=1:2.This measuring method is of high sensitivity,of good accuracy,of portable quickness and safe operation.