5-Br-PADAP分光光度法测定环境水中微量锌  

Spectrophotometric determination of trace zinc in environmental water with 5-Br-PADAP

作　　者：周文辉[1] 周秀林[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《工业水处理》2006年第4期74-76,共3页Industrial Water Treatment

摘　　要：在pH8.0的硼砂-硼酸缓冲溶液中,在非离子表面活性剂OP存在下,锌(Ⅱ)与5-Br-PADAP生成红色络合物,络合物的最大吸收波长为555nm,表观摩尔吸光系数ε=1.44×105L/(mol.cm)。测得络合物组成比为n〔(Zn(Ⅱ)〕n∶(5-Br-PADAP)=1∶2,锌质量浓度在0￣0.6mg/L符合比尔定律。加入掩蔽剂后用该方法测定环境水中微量锌,结果满意。A red complex of zinc （ Ⅱ ） with 2-[ （5-bromo-2-pyridyl） -azo] -5-diethyl-aminophenol（5-Br- PADAP） is formed in the medium of Na2B4O7-H3BO3（pH 8.0）buffer solution containing OP. The maximum absorption of complex is at 555 nm and its apparent molar absorptivity is 1.44× 10^5 L/（mol·cm）.The molar ratio of Zn （ Ⅱ ） to 5-Br-PADAP in the complex is 1 ： 2. The Beer＇s law is obeyed in the concentration range of 0-0.6 mg/L for zinc （ Ⅱ ）. The trace zinc can be determined directly in environmental water by adding masking agents and the results are satisfactory.

关 键 词：锌 环境水 分光光度法 

分 类 号：X832[环境科学与工程—环境工程]