气相分子吸收光谱法快速测定水中高锰酸盐指数  

Rapid Determination of CODMn by Molecular Absorption Spectrometry

作　　者：赵建平 沈璧君 赵洋甬 胡建林 

机构地区：[1]宁波市环境监测中心,浙江宁波315010

出　　处：《现代科学仪器》2011年第3期95-96,共2页Modern Scientific Instruments

基　　金：国家水专项水污染源应急监测技术体系研究(2009ZX07527-002-06)

摘　　要：以亚硝酸盐作为还原剂,通过间接测定亚硝酸盐的方式,建立了水中的高锰酸盐指数的快速定量分析方法。水样中的高锰酸盐加硫酸氧化后,用亚硝酸盐进行还原,再用分子光谱吸收法测定亚硝酸盐,从而间接测定高锰酸盐指数。结果表明,方法的检出范围为0～9mg/L,检出限0.29mg/L,平均回收率93.2～103.1%,相对标准偏差3.8～5.8%不高于10%。该方法具有测定快速、准确度高、浊度影响少、所用试剂安全环保的特点,特别适合于应急、在线监测、流动注射领域的仪器的开发与使用。This study describes a novel fast quantitative analysis method used nitrite as reductive agent for the detection of Potassium Permanganate Index（CODMn）.The acidulated permanganate in water was firstly deoxidized by nitrite.Subsequently,the concentration of nitrite was detected by molecular absorption spectrometry.Due to the reaction between permanganate and nitrite,the readout signals were related to the concentration of potassium Permanganate Index.The results indicated a high sensitivity and stability with a detection limit of 0.29 mg/l（R.S.D.% was 3.8%~5.8%） and the recovery was 93.2%~103.1% ranging from 0 to 9mg/l.The proposed method is rapid and accurate,few disturbances from the turbidity of the water and environmentally friendly.Taking into account these advantages,this method represents a promising platform for environmental emergency monitoring,on-line analysis and flow injection instrument exploitation and application.

关 键 词：亚硝酸盐 高锰酸盐 气相分子吸收光谱法 

分 类 号：X832[环境科学与工程—环境工程]