摘要
本文利用水合三氯乙醛在碱性条件下生成三氯甲烷的性质,以捕集阱顶空-气相色谱法测定三氯甲烷从而间接测得三氯乙醛的浓度。同时对实验条件进行了优化,确定了实验用水为Mill-Q超纯水,氢氧化钠加入量为15mg,氯化钠加入量为1.0g,平衡温度为60℃,平衡时间为30min,捕集阱循环次数为3次。实验结果表明,此方法在0.200μg/L-20.0μg/L的浓度范围内线性关系良好,回收率为86.0%-105.0%,相对标准偏差为3.0%-4.6%,检出限为0.07μg/L,其中灵敏度较普通顶空进样法提高了近6倍。该方法具有较高的灵敏度、精密度和准确度,满足地表水中三氯乙醛的测定要求。
Chloral hydrate can be converted to chloroform in the present of alkali. The headspace-trap and gas chromatography were used for determining the concentration of chloral indirectly by detecting the chloroform. The experimental conditions were optimized. The experimental water was supplied by Mill-Q ultrapure water. The optimum amount of sodium hydrate and sodium chloride was 15 mg and 1.0 g. Chloral in water was equilibrating at 60℃ for 30 minutes with the cycle number of three.The result showed good linearity in the range of 0.200μg/L-20.0μg/L. The recovery of standard addition was86.0%-105.0%.The RSD was between 3.0%-4.6%. The detection limit was 0.07μg/L. The sensitivity of this method was nearly 6 times higher than that of the ordinary headspace. This method has higher sensitivity,precision and accuracy. It is suitable for determination of chloral in surface water.
作者
何芸菁
He Yun-jing(Fuzhou Environmental Center, Fuzhou , Fujian 350011, China)
出处
《福建分析测试》
CAS
2018年第3期51-57,共7页
Fujian Analysis & Testing
