학술논문
分光光度法高锰酸盐指数自动分析仪应用研究 / Research on the Application of Automatic Analyzer for Permanganate Index Using Spectrophotometry
Document Type
Academic Journal
Author
Source
山西化工 / Shanxi Chemical Industry. 44(1):67-81
Subject
Language
Chinese
ISSN
1004-7050
Abstract
目前采用国标法GB/T11892-1989 检测高锰酸盐指数具有检测流程复杂、测试时试剂及水样使用量大、废水处理成本高等缺点.本文采用分光光度法方式测定水质CODMn并结合自动分析仪方式,可使方法检出限为 0.037 mg/L,最低检测质量浓度为 0.2 mg/L,低于国标方法的测定下限 0.5 mg/L.精密度测试结果显示,相对标准偏差范围为 1.07%～4.28%.准确度测试结果显示,相对误差为 1.2%.当检测标准物质结果在真值的允许误差范围内,采用加标回收法对实际水样的加标回收率范围为91.6%～103.0%.此外,与国标滴定法的相对误差范围为±6.3%.该方法具有人为误差小、试剂和样品消耗少等优势,且精密度和准确度较好.
At present,the national standard method GB/T11892-1989 is used to detect the permanganate index has the disadvantages of complex detection process,large use of reagents and water samples during testing,and high cost of wastewater treatment.This article uses spectrophotometry to determine CODMn in water quality and combines it with an automatic analyzer.The detection limit of the method is 0.037 mg/L,and the minimum detection mass concentration is 0.2 mg/L,which is lower than the lower limit of the national standard method of 0.5 mg/L.The precision test results show that the relative standard deviation range is 1.07%to 4.28%.The accuracy test results show a relative error of 1.2%.When the results of the standard substance detection are within the allowable error range of the true value,the spiked recovery rate range of the actual water sample using the spiked recovery method is 91.6%to 103.0%.In addition,the relative error range with the national standard titration method is±6.3%.This method has advantages such as low human error,low consumption of reagents and samples,and good precision and accuracy.
At present,the national standard method GB/T11892-1989 is used to detect the permanganate index has the disadvantages of complex detection process,large use of reagents and water samples during testing,and high cost of wastewater treatment.This article uses spectrophotometry to determine CODMn in water quality and combines it with an automatic analyzer.The detection limit of the method is 0.037 mg/L,and the minimum detection mass concentration is 0.2 mg/L,which is lower than the lower limit of the national standard method of 0.5 mg/L.The precision test results show that the relative standard deviation range is 1.07%to 4.28%.The accuracy test results show a relative error of 1.2%.When the results of the standard substance detection are within the allowable error range of the true value,the spiked recovery rate range of the actual water sample using the spiked recovery method is 91.6%to 103.0%.In addition,the relative error range with the national standard titration method is±6.3%.This method has advantages such as low human error,low consumption of reagents and samples,and good precision and accuracy.