A simple and low-cost composite film was prepared,based on which a sensitive detection method of lead ions(Pb2+)in aqueous solutions with naked eye was developed. Polyamide-6(PA-6) thin layer chromatographic membrane was selected to adsorb bovine serum albumin( BSA)modified gold nanoparticle( AuNPs),and a stable BSA-AuNPs/PA-6 nanocomposite film with a uniform red color was prepared. The adsorption time of BSA - AuNPs to PA-6 membrane, concentrations of Na2 S2 O3 and 2-ME as well as reaction temperature and time in the 2-ME-Na2 S2 O3 -AuNPs/Pb2+leaching system were investigated,which demonstrated obvious effects on the detection of Pb2+. Un-der the optimal conditions( BSA - AuNPs and PA-6 incubate together for 30 min,0. 05 mol/L Na2 S2 O3 ,0. 25 mol/L 2-ME,nanocomposite film and leaching agents incubate together at 80 ℃ for 20 min),the BSA-AuNPs/PA-6 nanocomposite film allowed for the sensitive detection of Pb2+ with naked eye with a sensitivity as low as 2. 0 × 10 -8 mol/L. The method showed a high selectivity,and was applied in the naked eye detection of Pb2+ in tap water with a detection limit of 5. 0 × 10-8 mol/L.%基于2-巯基乙醇-硫代硫酸钠-纳米金/Pb2＋（2-ME-Na2 S2 O3-AuNPs/Pb2＋）体系的纳米金浸出反应，开发了一种低成本、可通过肉眼灵敏检测Pb2＋的纳米复合薄膜。优选出聚酰胺-6（ PA-6）层析薄膜，通过吸附牛血清白蛋白（ BSA）修饰的纳米金（ AuNPs），制备得到一种色泽均匀的BSA-AuNPs/PA-6纳米复合薄膜。考察了 PA-6薄膜吸附 BSA - AuNPs 的时间，2-ME - Na2 S2 O3- AuNPs/Pb2＋反应体系中2-ME 和Na2 S2 O3的浓度，以及反应温度和反应时间对Pb2＋检测的影响。结果表明，在优化条件下，吸附30 min后，0.05 mol/L的Na2 S2 O3及0.25 mol/L的2-ME在80℃下反应20 min，即可通过肉眼实现对Pb2＋的检测，灵敏度可达2.0×10-8 mol/L；同时，该方法具有高选择性。将BSA-AuNPs/ PA-6纳米复合薄膜应用于自来水中Pb2＋的检测，通过肉眼判断，检出限可达到5.0×10-8 mol/L。
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