固体石蜡碳糊-磷钼酸根电极的研制与应用  

CARBON PASTE-PHOSPHOMOLYBDATE ION SELECTIVE ELECTRODE USING PARAFFIN AS BINDER

作　　者：李建平[1] 吴秉功[1] 

机构地区：[1]桂林工学院应用化学系,桂林541004

出　　处：《理化检验（化学分册）》1998年第12期533-534,538,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：桂林工学院青年科技基金资助课题

摘　　要：研究了以固体石蜡作粘和剂的碳糊电极,在磷钼酸溶液中活化一定时间后,该电极对1.0×10^(-6)～5.0×10^(-4)mol·L^(-1)的磷钼酸有能斯特响应,斜率约为30mV,检出限为3.2×10^(-7)mol·L^(-1).电极的稳定性和选择性较好,已用于矿石、水样中磷的测定,结果满意.It is reported in this paper that a new phosphomolybdate ion selective electrode is prepared by activation of the paraffin binded carbon paste electrode in a solution of phosphomolybdate for 12-18h, after which an activated thin membrane is formed on the surface of the electrode. The modified electrode gives a linear potential response with respect to the logarithm of phosphomolybdate concentration in the range of 1. 0×10-6-5.0×10-4mol·L-1 with a slope of 30 mV, and a detection limit of 3. 2×10-7mol·L-1. The new electrode proves to be good in stability and reproducibility. It has been applied to the determination of trace phosphate in rocks and river water with satisfactory results.

关 键 词：碳糊电极 磷 测定 固体石蜡 矿石 水样 磷钼酸 

分 类 号：O613.62[理学—无机化学]