水中总硬度的连续流动分析测定法  

Determination of Total Hardness in Water by Air-Segmented Continuous Flow Analysis

作　　者：黄伟华[1] 陈芳[1] 曹晓玲[1] 

机构地区：[1]南昌市疾病预防控制中心理化科,江西南昌330006

出　　处：《环境与健康杂志》2007年第1期52-53,共2页Journal of Environment and Health

摘　　要：目的研究检测水质总硬度的连续流动分析法。方法采用SKALARSAN++四通道连续流动分析仪,根据钙镁离子在pH=10.0条件下与铬黑T指示剂生成天蓝色配合物的原理,在490nm处检测水质总硬度。结果线性范围为5～500mg/L(r>0.9990),RSD≤3.26%,回收率为94.12%～104.30%,最低检出浓度为1.43mg/L,与《生活饮用水卫生规范》(2001)的Na2EDTA滴定法比较,其结果差异无统计学意义。结论该方法快捷,结果准确,灵敏度高,适合水中总硬度的测定。Objective To develope a method for determination of total hardness in water by air-segmented continuous flow analysis. Methods The total hardness in water was determined at 490 nm with air-segmented continuous flow analyzer based on the formulation of a blue compound by calcium and magnesium ions at pH value of 10.0. Results The linear range of method was 5-500 mg/L （r〉0.999 0）, and RSDs were not more than 3.26%. The recovery rates were 94.12%-104.30% .The lowest detected concentration was 1.43 mg/L. There was no significant difference between the resuhs of this method and Na2EDTA titration. Conclusion The method was rapid, accurate and highly sensitive.

关 键 词：水 总硬度 连续流动分析法 

分 类 号：O657.3[理学—分析化学]