吹扫捕集气相色谱法测定水中吡啶  

Determination of Pyridine in Water by Purge and Trap with Gas Chromatography

作　　者：方羽 黄建飞 张华静 杨莹 周双 王兰兰 FANG Yu;HUANG Jianfei;ZHANG Huajing;YANG Ying;ZHOU Shuang;WANG Lanlan(Jingmen Ecology and Environment Monitoring Station,Jingmen 448000,China;Jingmen Ecology and Environment Monitoring Center,Department of Ecology and Environment of Hubei Province,Jingmen 448000,China)

机构地区：[1]荆门市生态环境监测站,湖北荆门448000 [2]湖北省生态环境厅荆门生态环境监测中心,湖北荆门448000

出　　处：《化学与生物工程》2025年第2期63-65,68,共4页Chemistry & Bioengineering

基　　金：国家自然科学基金项目(21173026);湖北省自然科学基金重点项目(2013CFA107);荆州市科技项目(019EC61-14)。

摘　　要：采用吹扫捕集气相色谱法测定水中的吡啶,通过在样品中加入适量的碳酸钠及控制合适的吹扫时间大大提高了水中吡啶的响应值。结果表明,在40 mL水样中加入8.0 g碳酸钠、吹扫时间为13 min的条件下,吹扫效率较高;吡啶浓度在0.01~2.00 mg·L^(-1)范围内与响应值线性关系良好,检出限低至0.002 mg·L^(-1),优于HJ 1072-2019《水质吡啶的测定顶空/气相色谱法》要求(0.03 mg·L^(-1));对饮用水水源地样品进行了3个浓度(0.10 mg·L^(-1)、1.00 mg·L^(-1)、2.00 mg·L^(-1))的精密度和加标回收率实验,相对标准偏差为2.7%~5.3%,平均加标回收率为97.0%~106.0%。该方法操作简单,成本低,更适用于低浓度吡啶的测定。In this paper,we determined pyridine in water by purge and trap with gas chromatography,and greatly improved the response value of pyridine in water by adding an appropriate amount of sodium carbonate to the sample and controlling the appropriate purging time.The results show that the purging efficiency is higher when adding 8.0 g sodium carbonate into 40 mL water sample and purging for 13 min.The linear relationship between pyridine concentration and response value is good within the range of 0.01-2.00 mg·L^(-1),with a detection limit as low as 0.002 mg·L^(-1),which is better than the requirement of HJ 1072-2019"Determination of Pyridine in Water Quality by Headspace/Gas Chromatography"(0.03 mg·L^(-1)).Precision and recovery experiment of samples from drinking water sources at three concentrations(0.10 mg·L^(-1),1.00 mg·L^(-1),2.00 mg·L^(-1))indicate that the relative standard deviations is 2.7%-5.3%,and the average recovery is 97.0%-106.0%.This method is more suitable for detecting low concentration of pyridine with easy operation and low cost.

关 键 词：吹扫捕集 气相色谱 吡啶 饮用水 低浓度 

分 类 号：X830.2[环境科学与工程—环境工程] O657[理学—分析化学]