柱前衍生-气相色谱法同时测定饮用水中2,4-滴和灭草松  

GC-ECD Determination of 2,4-D and Bentazone in Drinking Water by Pre-column Derivation

作　　者：谭海彬 曾锦明 

机构地区：[1]珠海水务集团水质监测研究中心,广东珠海519020

出　　处：《广东化工》2012年第1期99-100,共2页Guangdong Chemical Industry

基　　金：863计划(2008AA06A413)资助

摘　　要：采用柱前衍生-气相色谱法-电子捕获检测器（GC-ECD）对饮用水中2,4-滴和灭草松进行检测。10 mL水样,经乙酸乙酯萃取后挥干溶剂,在二氯甲烷溶液中与碘甲烷、四丁基硫酸氢胺-氢氧化钠水溶液反应衍生,最后利用带电子捕获检测器的气相色谱仪进行检测。外标法定量,2,4-滴和灭草松在3.0-100.0μg/L范围内线性关系良好,相关系数分别为0.994和0.997。方法检出限（MDL）分别为：1.6μg/L和1.3μg/L。对2个添加水平进行回收实验,回收率分别为96.0%-126.6%,相对标准偏差（RSD,n=5）在4.9%-13.5%之间。本方法具有回收率高的优点,适用于饮用水中2,4-滴和灭草松的检测需要。A method for GC-ECD determination of 2,4-D and Bentazone in water by pre-colunm derivation was established.10 mL of water sample was extracted by ethyl acetate,then solvent was removed.The reaction proceed with dichloromethane as solvent,Iodomethane as reactant,Tetrabuty lammonium hydrogen sulfate and sodium hydroxide aq.Solution as catalyst.The reaction mixture was determined by capillary column gas chromatography with electron capture detector（ECD） and quantified by external standard method.The coefficient correlation for 2,4-D and Bentazone were 0.994 and 0.997 in the linear range at 3.0-100.0 μg/L.The method detection limit were 1.6 μg/L and 1.3 μg/L.Overall recovery and repeatability（relative standard deviations,RSD,n=5） ranged from 96.0 % to 126.6 %,and from 4.9 % to 13.5 %,respectively.The method has the advantage of high efficiency.It can be applied to the determination of 2,4-D and Bentazone in drinking water.

关 键 词：2 4-滴 灭草松 衍生 饮用水 气相色谱 

分 类 号：O65[理学—分析化学]