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本文以四苯硼钠为电活性物质,邻苯二甲酸二(2-乙基己)酯为增塑剂,制成PVC涂碳电极,对其性能进行了测试。电极对阳离子表面活性剂有很高的选择性响应。用十六烷基三甲基溴化铵和不同链长的烷基苄基二甲基溴化铵(新洁尔灭)为代表,进行了测定,检测下限分别为:CTAB—2×10~(-6)M;新洁尔灭—5×10~(-6)M。从响应曲线的折点(见图2)可测得表面活性剂的重要参数一临界胶束浓度(CMC)。
In this paper, sodium tetraphenylborate as electroactive material, di (2-ethylhexyl) phthalate plasticizer, made of carbon coated carbon electrode, its performance was tested. The electrode has a very high selectivity for cationic surfactants. Cetyltrimethylammonium bromide and alkylbenzyl dimethyl ammonium bromide (Bromo-benzalkonium bromide) of different chain lengths were used as the representative to determine the lower limits of detection: CTAB-2 × 10 -6 ) M; Bromogeramine -5 × 10 ~ (-6) M. A critical surfactant-critical micelle concentration (CMC) can be determined from the breakpoints of the response curve (see Figure 2).