摘要
测定水中苦味酸的国标方法——衍生化-液液萃取-气相色谱法采用的提取溶剂苯毒性较大,杂质较多,苦味酸在衍生过程中有部分损失。在国标方法的基础上,改用环己烷为提取溶剂,以溶剂液封加盖的方式,降低了衍生化产物损耗。选用中口径毛细管色谱柱,优化了色谱条件,有效地将衍生化产物与杂质分离。方法在0.500μg/L～40.0μg/L范围内线性良好,检出限为0.083μg/L,标准溶液平行测定6次的RSD≤5.3%,实际样品加标回收率为93.9%～104%。
Compared with the national standard method, the key technology of a derivatization gas chromatography method for the determination of picric acid in water is described. Use cyclohexane as extraction solvent instead of benzene, the target compound was separated from others impactfully through DB-SMS capillary column （30 m × 0.25 mm ×0.25 μm） and then determined by GC-ECD. The linearity ranged from 0. 500 μg/L to 40.0 μg/L. The detection limit come to be 0. 083 μg/L. The RSD of replicate measurements of standard solution was less than 5.3% , and the average recoveries ranged from 93.9% to 104%.
出处
《环境监测管理与技术》
2013年第4期39-41,共3页
The Administration and Technique of Environmental Monitoring
关键词
苦味酸
衍生化
液液萃取
气相色谱法
水质
Picric acid
Derivatization
Liquid-liquid extraction
Gas chromatography
Water quality
