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 chroma-tography 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-5 MS 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%.
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