海水中磷酸盐的在线快速检测  

On-line rapid determination of phosphate in seawater

作　　者：佟玲[1,2] 张新申[2] 陈伟[1] 孙冬梅[2] 俞凌云[2] 涂杰[2] 蒋小萍[2] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]皮革化学与工程教育部重点实验室,四川成都610065

出　　处：《海洋环境科学》2009年第1期76-79,共4页Marine Environmental Science

基　　金：国家863计划(200410)

摘　　要：利用孔雀绿－磷钼杂多酸分光光度法与流动注射分析（FIA）联用，建立了一种简便、快速、直接的海水中磷酸盐的测定方法。在优化的实验条件下，当磷酸盐浓度在1～50μg／L时呈现良好的线性，其线性方程为：y=1．2243x＋3．4529（R^2=0．9995）；检出限（3σ）为0．29μg/L；相对标准偏差（RSD）为0．76％（50μg/L的磷酸盐添加于空白海水，n=8）。利用本方法分析海水水样中的磷酸盐，回收率为91．9％～108．2％。该方法不仅适用于海水中磷酸盐在实验室中的测定，而且满足监测站、监测船等的对磷酸盐的在线快速监测。A new method of the compact, rapid and direct detection of trace phosphate in seawater was described by flow injection spectrophotometry with Molybdophosphate and malachite green. Under the optimal conditions, the system exhibited the detection limit of 0.29 μg/L, reproducibility of 0.76 % RSD for 50μg/L phosphate ion added in seawater （ n = 8 ） and the linear response y = 1. 2243x ＋ 3. 4529（ R^2 =0. 9995 ）. When calibrated in the field with standards in the range 1 - 50 μg/L. The results were satisfied using this methnd to analyze the phosphate in seawater, and the range of recovery percentages was from 91.9 to 108.2 %. The FIA system was evaluated for the determination of phosphate in monitoring station, survey boat and laboratory.

关 键 词：流动注射 分光光度法 海水 磷酸盐 孔雀石绿 

分 类 号：P734.4[天文地球—海洋化学]