表面活性剂增敏光度法测定痕量铅  

Determination of Trace Lead (Ⅱ) by Micellar Sensibilization Spectrophotometry

作　　者：黄余改[1] 方夏[1] 赵霞[1] 浦小雨[1] 

机构地区：[1]江苏教育学院化学系,江苏南京210013

出　　处：《江苏教育学院学报（自然科学版）》2008年第3期22-24,共3页Journal of Jiangsu Institute of Education(Social Science)

摘　　要：研究了阴离子表面活性剂十二烷基苯磺酸钠(SDBS)存在下,铅与1-(2-吡啶偶氮)-2-萘酚(PAN)的显色反应,建立了一种微量铅测定的新方法.结果表明:在pH8.5的Na_2B_4O_7-HCl缓冲溶液中,pb^(2+)与PAN及SDBS生成紫红色配合物,其最大吸收波长为560nm,表观摩尔吸光系数为1.3×10~4L·mol^(-1)·cm^(-1),pb^(2+)质量浓度在0～8μg/mL符合比耳定律.此方法用于印刷厂厂房空气中铅含量检测,结果令人满意.The chromogenie reaction of Pb（ lI ） with 1-（2-Pyridylazo）-2-naphthol （PAN） was studied in the presence of cationic suffactant sodium dodecyl-benzenesulfonate （SDBS）. The results show that Pb（ II ） was capable of reacting with PAN and SDBS to form a stable red complex in the medium of Na2B4OT-HCl buffer solution（ pH =8.5）. At the maximum absorption wavelength of 560nm , the apparent molar absorptivity was 1.3 ×10^4L·mol^-1·cm^-1. Beer＇s law was obeyed in the range of O to 8μg/mL Pb （ II ）. The method has been appl^ied to the determination of trace Pb （II） in printery atmosphere with satisfactory results.

关 键 词：PAN SDBS 分光光度法 铅 

分 类 号：TQ423.11[化学工程] TS207.51[轻工技术与工程—食品科学]