引用本文:王玉祥,吴莹,张宗祥,程滢,薛锐,王厚俊.苦味酸测定中关键问题的研究[J].环境监控与预警,2020,12(1):41-43
WANG Yu-xiang,WU Ying,ZHANG Zong-xiang,CHENG Ying,XUE Rui,WANG Hou-jun.Research on Key Problems in Determination of Picric Acid[J].Environmental Monitoring and Forewarning,2020,12(1):41-43
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苦味酸测定中关键问题的研究
王玉祥,吴莹,张宗祥,程滢,薛锐,王厚俊
作者单位
王玉祥,吴莹,张宗祥,程滢,薛锐,王厚俊 江苏省泰州环境监测中心江苏 泰州 225300 
摘要:
目前测定苦味酸的国标方法为《生活饮用水标准检验方法有机物指标》(GB/T 5750.8—2006)中的衍生物-液液萃取-气相色谱法,在实际测试过程中,发现水样pH值和基质效应会影响苦味酸测定。当pH值为8~12时,生成的氯化苦响应强度变化不大;在pH约为13时,响应强度最大。水质中除腐殖酸、硝基甲烷及2,4,6-三硝基甲苯会影响苦味酸测定外,硝基酚类和甲基酚类同样起到正干扰作用,因此,国标方法不能全面和准确地测定水中的苦味酸含量。
关键词:  苦味酸  pH值  基质效应  衍生物-液液萃取-气相色谱法
DOI:
分类号:X832;O657.7+1
文献标识码:B
基金项目:
Research on Key Problems in Determination of Picric Acid
WANG Yu-xiang,WU Ying,ZHANG Zong-xiang,CHENG Ying,XUE Rui,WANG Hou-jun
Abstract:
At present, the national standard method for the determination of picric acid is the derivative liquid liquid extraction gas chromatography in the Organic Indicators of the Standard Test Method for Drinking Water(GB/T 5750.8 —2006). In the actual test, it was found that the pH value and matrix effects of water samples affected the determination of picric acid. When the pH value were in the range of 8 ~ 12, the response of chloropicrin showed little change, while the pH value was about 13, the maximum response was obtained. In addition to humic acid, nitromethane and 2,4,6 trinitrotoluene in water, nitrophenols and methyl phenols also play a positive role in the determination of picric acid. Therefore, the national standard method cannot comprehensively and accurately determine the content of picric acid in water.
Key words:  Picric acid  pH value  Matrix effects  Derivative liquid liquid extraction gas chromatography