哈希比色法测定低浓度化学需氧量的改进_惠学香.pdfVIP

第 22卷第 9期 化工时刊 Vo.l 22, No. 9 2008年 9月 Chem ica l Industry Tmi es Sep. 9. 2008 哈希比色法测定低浓度化学 需氧量的改进 惠学香 (江苏省仪征市环境监测站, 江苏 仪征 211400) 摘 要 用哈希比色法测定化学 需氧量, 以吸光度对 COD cr浓 度值绘 制标准 曲线, 输入到 哈希分 光光度 计用户 自建 程序中, 获得一个适合的 COD cr测定程序, 待水样消解后比色, 可直接读出 COD cr浓度值。此分析方 法能批量测 定水 样, 节省试剂, 方便快捷, 在大批量水质分析方面优势显著。对哈希比色法测定低浓度化学需氧 量的方法作了改进, 用 改进后的方法测定水样 中低浓度化学需氧量, 其精密度和准确度均较好, 符合测定要求。 关键词 化学需氧量 重铬酸钾 哈希比色法 测定 Improved the Hash Colorimetry ThatDeterm inated the Low Concentration of Chem icalOxygen Demand H u iXuex iang ( Y izheng Env ironm entalM on itoring Sta tion, Jiangsu Y izheng 211400) Abstract The chem ical oxygen dem and w ere m easured by hash co lorim etry, m app ing standard curve w ith ab sorption to COD cr va lue. A fter itw as put in to hash spectrophotom eter the self- bu ilt process, a su itable CODcr deter m ination procedure. W ater sam ples w ere com pared after d igestion color, CODcr concentration could be d irectly read ou.t Th is ana lysism ethod could determ inate the quan tity ofw ater, save reagents, and itw as conven ient and qu ick. The m ethod had sign ificant advantages in high- vo lum e wa ter quality ana lysis. The hash co lor im etry that determ inated the low concentration o f chem ica l oxygen dem and w as im proved, and the improved m ethod w as used to determ inee the low concentration o f chem ical oxygen dem and in w ater sam ples. Its prec ision and accuracy w ere better, and itm et the re quirem