【摘要】 目的对饮用水中卤乙酸的衍生-气相色谱测定法进行改进。方法对5种卤乙酸(一氯乙酸、一溴乙酸、二氯乙酸、三氯乙酸和二溴乙酸)的衍生-气相色谱测定法的前处理条件(五水硫酸铜及衍生化试剂酸化甲醇、硫酸钠水溶液、甲基叔丁基醚、饱和碳酸氢钠溶液加入量)进行改进,测定其对卤乙酸回收率的影响。结果优化实验方法后,在0.3～200.0μg/L线性范围内,5种卤乙酸的回归方程相关系数均在0.99以上,加标回收率为90.0%~103.2%,相对标准偏差为0.42%~2.76%,检出限分别为0.65、0.50、0.50、0.30、0.30μg/L。结论该方法具有较好的准确性、精密度和灵敏度,适用于饮用水中卤乙酸的测定。更多还原

【Abstract】 Objective To modify the determination of haloacetic acids in drinking water by derivative gas chromatography.Methods Various experimental conditions affecting the recovery rates of the five haloacetic acids(MCAA,MBAA,DCAA,TCAA and DBAA),which were CuSO4·5H2O,dosage of the derivatization reagent-acidified methanol,volume of Na2SO4 aqueous solution,volume of methyl tert-butyl ether and volume of saturated sodium bicarbonate solution,were discussed and optimized.Results The optimized method displayed a wider linear range of 0.3-200.0 μg/L with all of the correlation coefficients of more than 0.99,the average recovery rates were 90.0%-103.2%,relative standard deviations(RSDs) were 0.42%-2.76%,the limits of detection were 0.65,0.5,0.5,0.3 and 0.3 μg/L,respectively.Conclusion This method has good accuracy,precision and sensitivity,and it is applicable to the determination of haloacetic acids in drinking water.更多还原