摘要
依据亚硝酸根对溴酸钾氧化罗丹明Ｂ褪色反应体系的催化作用,建立了测定痕量亚硝酸根的停流－催化褪色光度法,确定了最佳测定条件：［ＫＢｒＯ３］＝５.０×１０－２ｍｏｌ·Ｌ－１,（罗丹明Ｂ］＝４.８×１０－５ｍｏｌ·Ｌ－１,［Ｈ２ＳＯ４］＝０.７５ｍｏｌ·Ｌ－１,５０℃。线性测定范围为０—０.６μｇ·ｍ１－１,方法检出限为２ｎ８·ｍ１－１。本法操作方便、快速、重现性好,且选择性较一般催化光度法显著提高。测定了不同样品中的亚硝酸根含量,结果满意。加标回收率为９６.１％－１０３.０％,相对标准偏差ＲＳＤ（ｎ＝６）为２.１％－４.０％。
A stopped flow-catalytic spectrophotometric procedure for the determination of nitrite was established based on it's catalytic effect on the bromate-rhodamine B oxidation decolouring reaction.The optimal conditions for the determination were established as:KBrO3=5.0×10-2mol·L-1,rhodamine B=4.8 × 10-5mol· L-1,H2SO4=0.75mol·L-1,and 50℃.Thecalibration graph was linear for0-0. 6μg·L-1NO2,and the detection limit was 2 ng· L-1.The reproducibility of the method was good,and the selectivity was improved significantly,with respect to conventional procedures.Nitrite contents in soil,vegetable,rain water and wastewater had been determied,and the results were satisfactory,the recoveries were 96.1%-103.3%,and RSD(n=6)=2.1%-4.0%.
出处
《环境科学》
CAS
CSSCI
CSCD
北大核心
1995年第1期71-73,共3页
Environmental Science
关键词
亚硝酸根
催化褪色光度法
停流流动注射
nitrite
catalytic decolouring spectrophotometry
determination procedure.
