全自动间断比色分析法测定锅炉用水和冷却水的碱度

Determination of Alkalinity in Boiler Water and Cooling Water by Full Automatic Continuous Analyzer Based on Colorimetric Method

利用CleverChem200型全自动间断分析仪，采用甲基橙光度比色法快速测定锅炉用水和冷却水中的碱度。考察了方法的测量条件，结果表明，当200．0m/L碱度标准溶液取样量为300uL、试剂R1为100uL、反应时间为5min、测量波长为550nm时，得到标准曲线的相关系数为0．999。在碱度为50～160．0mg／L范围内，最大相对标准偏差为1．2％，最大相对误差为2．0％，回收率在93％～107％之间。方法的检出限为10．61mg／L。同时与酸碱滴定法相比较，本方法检测速度快，1h内能分析96个样品，样品和试剂的用量少，有效降低了分析成本和实验室的二次污染，特别适合于多样品、多项目的分析。

CleverChem200 automatic continuous analyzer based on methyl orange spectrophotomettic colorimetry was used for rapid determination of alkalinity in boiler water and cooling water. The measurement conditions of the method were investigated. The results showed that at 300 uL of 200.0 mg/L alkalinity standard solution sample volume, 100 uL of reagent R1,5 min of reaction time, 550 nm of wavelength, the correlation coefficient of standard curve was 0. 999. In the alkalinity range of 50 to 160 mg/ L, the maximum relative standard deviation was 1.2%, the maximum relative error was 2.0%. The recovery was 93% to 107%. The detection limit was 10.61 mg/L. Compared with acid-base titration method, this method has the advantages of fast speed, hourly analysis of 96 samples, low sample and reagent consumption, low cost and low pollution, especially suitable for many samples and multiple projects.