摘要：
对水质中钙、镁和硬度的在线监测方法进行了研究.利用稳定性好、灵敏度高的偶氮氯膦Ⅲ作显色剂,在pH70时,加入EGTA掩蔽钙,测定镁;在pH为25,掩蔽镁的干扰,测定钙,在线分析时,采用混合分析流程,加三通分流消除气泡干扰,测定数据稳定可靠,镁的测试范围1×10-3～48×10-3mmol/L,钙的测试范围1×10-3～50×10-3mmol/L,钙镁的检测限05×10-3mmol/L,该方法开发成在线仪器,可单独测定钙、镁,又可根据水样得到水质硬度,具有较好的实用性.
关键词:
水质,
钙镁硬度,
在线测试
Abstract:
The paper has studied on-line analysis method of Ca, Mgand hardness in water. Chlorophosphoazo Ⅲ adopting the highersensitivity and stability was used as the developer. Magnesiumcan he measured by adding EGTA for sheltering Ca when the pHis 7.0 .Then calcium can he done by sheltering Mg when the pHis 2. 5 .When it is on-Line analysis mending analysis flow processcan eliminated gas bubble interference with T tube. The deter-mined data is stable and credible. The linear range for magnesiumis 1X10-3～48X 10-3mmol/ L. The linear range for calcium is1X 10-3～50X 10-3mmo1/ L, The Linear range for Ca and Mg is 0.5×10-3.The on-line instrument can be used to de-temine Ca Mg and get the water hardness according to the water sample.The method has better practicability.
杨铸, 孙原. 水质中钙、镁和硬度的在线监测[J]. 工业水处理, 1998, 18(2): 30-32,46.
Yang Zhu, Sun Yuan. CONTINUOUS ON LINE ANALYSIS OF CALCIUM, MAGNESIUM AND HARDNESS I N WATER[J]. INDUSTRIAL WATER TREATMENT, 1998, 18(2): 30-32,46.