| 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: |
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| Research on Key Problems in Determination of Picric Acid |
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WANG Yu-xiang，WU Ying，ZHANG Zong-xiang，CHENG Ying，XUE Rui，WANG Hou-jun
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Jiangsu Taizhou Environmental Monitoring Center，Taizhou，Jiangsu 225300，China
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| 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 |
