Determination of 8 Kinds of Acid Herbicide Residues in Water by Derived-GC/MS Method

A novel method extracting with ether, deriving by methanol, deteminating with gas chromatography-mass spectrometry (GC-MS) for analyzing 8 kinds of acid herbicide residues in water has been established. The optimum experimental conditions were as follows: Adding 8 drops of concentrated sulfuric acid; adding 1.0 mL methanol; deriving 60.0 min. Linear of all herbicides is good in the range of 0.05 to 2.5 μg/L, and the detection limit were under or equal to 0.02 μg/L. the results gained from method were accurate and stable, and the recoveries of all herbicides were between 82.07~116.99%at 0.10, 0.50, 1.00, 1.50μg/L, and the relative standard deviations were below 7.68%. The method is reliable and stable, and so selective that there is no interference in determination of herbicides residues in water.