以脲醛树脂为盐桥接界,涂丝Ag/Ag2S电极为指示电极,裸露式Ag/AgCl电极为参比电极,制备了全固态复合pS传感器。性能测试表明,在10-1~10-6mol/L浓度范围S2-呈Nernst响应,检出限4.0×10-7mol/L,响应斜率29.3mV/pS;树脂接界具有导电性好、接界电位低、漂移小、可制成任意形状等特点。用于实际样品与分光光度法对照,相对误差≤1.4%,可直接测定糊状物和土壤中S2-含量。同时探讨了Ag-Ag2S电极的“老化”和“中毒”现象。 An all-solid-state composite pS sensor was prepared by using urea-formaldehyde resin as the salt bridge and Ag / Ag2S electrode with coated wire as the indicator electrode and bare Ag / AgCl electrode as the reference electrode. The performance test showed that the response of S2- was Nernst in the concentration range of 10-1 ~ 10-6mol / L with the detection limit of 4.0 × 10-7mol / L and the response slope of 29.3mV / pS. The resin junction had good electrical conductivity, Low potential, drift is small, can be made of any shape and so on. For the actual sample and spectrophotometric control, the relative error ≤ 1.4%, can be directly measured paste and soil S2-content. The phenomenon of “aging” and “poisoning” of Ag-Ag2S electrode was also discussed.