GDX 502管吸附-二氯甲烷解吸-气相色谱法测定气中的吡啶  

Determination of Pyridine in Air by Gas Chromatography Coupled with GDX 502 Tube Adsorption and Dichloromethane Desorption

作　　者：尹丹莉 胡恩宇 高琦 张欣 YIN Dan-li;HU En-yu;GAO Qi;ZHANG Xin(Jiangsu Nanjing Environmental Monitoring Center,Nanjing,Jiangsu 210013,China)

机构地区：[1]江苏省南京环境监测中心

出　　处：《环境监控与预警》2019年第6期28-31,共4页Environmental Monitoring and Forewarning

摘　　要：建立了GDX 502管吸附-二氯甲烷解吸-气相色谱测定气中吡啶的方法,考察吸附管类型、解吸溶剂、解吸溶剂体积、采样时间和采样流量对测定结果的影响。结果表明,气中吡啶用GDX 502吸附管以0.5 L/min的流量采样20 min,二氯甲烷解吸至1 mL,DB-1(30 m×250μm×0.25μm)柱分离,空白样品低、中、高3种加标量回收率为90.8%~108%(n=6),相对标准偏差为2.9%~4.4%,方法在0~19.6 mg/L线性范围内响应良好,相关系数(r)=0.9999。当采样体积为10 L时,检出限为0.01 mg/m 3。该方法重复性好、回收率高、干扰较小,能够满足空气和废气中吡啶分析的要求。The determination method of pyridine in air was established by gas chromatography coupled with GDX 502 adsorption dichloromethane desorption.The influence factors such as the type of adsorption tube,desorption solvent,the volume of desorption solvent,sampling time and sampling flow rate were investigated.The results showed that when the pyridine in air was adsorbed by GDX 502 tubes atthe flowrate of 0.5 L/min in 20 min,desorbed by 1mL dichloromethane and separated by DB-1(30 m×250μm×0.25μm)capillarycolumn,the recoveries spiked in blank samples with low,medium and high concentrations(n=6)were 90.8%~108%,and the relative standard deviations were 2.9%~4.4%.The linear relationship was good enough(r=0.9999)between 0~19.6 mg/L.The detection limit was 0.01 mg/m 3 when the sampling volume was 10 L.The method has good repeatability,high recovery,strong anti-interference ability,and can meet the requirements of determination of pyridine in air and waste gas.

关 键 词：活性炭管 GDX 502管 吡啶 气相色谱法 

分 类 号：X831[环境科学与工程—环境工程] O657.71[理学—分析化学]