流动注射-结晶紫-磷钼杂多酸离子缔合体系光度法测定水中痕量正磷酸盐  

FIA-SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF ORTHO-PHOSPHATE IN NATURAL WATER

作　　者：滕恩江[1] 傅强[1] 刘廷良[1] 朱玉瑞[2] 

机构地区：[1]中国环境监测总站 [2]中国科学技术大学

出　　处：《理化检验（化学分册）》1998年第2期55-57,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在一定的酸度条件下,结晶紫与磷钼杂多酸离子缔合物的流动注射分光光度法可直接测定痕量磷.灵敏度高,重现性和选择性好.水中常见离子不干扰痕量磷的测定,工作曲线的线性范围为0～500μg·L^(-1)的磷,检出下限达1.0μg·L^(-1),以120h^(-1)采样频率,对各种天然水样进行测定,回收率为92.5%～105.0%,相对标准偏差为0.1%～6.7%.In an appropriate acidic medium, the ion-associate formed by molybdophosphate and crystal violet is stable without any non-ionic surfactants. Its maximum wavelength is at 540nm in the range of 400~700nm, while the maximum wavelength of the reagent blank of crys-tal violet is at 610nm. Based on this fact, a flow injection spectrophotometric method for direct determination of trace amounts of phosphorus in natural water with high sensitivity and selectivi-ty is developed. The calibration graph is linear within 0 ~500礸 ?L^(-1) of P, the detection limit is 1. 0/礸 ?L_(-1) for P, and the coefficient of variation for determination of 50礸 ?L^(-1) of P is 0. 68%. The common ions present in natural water do not interfere the determination. This method has been applied to the determination of soluble orthophosphate in lake and tap water samples, the recoveries are 92. 5%~105. 0%. The sampling rate is up to 120h^(-1).

关 键 词：流动注射分析 磷 光度法 水样 

分 类 号：O661.1[理学—分析化学]