Analysis of chloroacetanilide herbicides in water samples by solid-phase microextraction coupled with gas chromatography-mass spectrometry.
A solid-phase microextraction (SPME) method has been developed for the determination of 3 chloroacetanilide herbicides in both fresh and seawater samples. The extracted sample was analyzed by gas chromatography with mass spectrometry detection (GC-MS), and parameters affecting SPME operation including fibre type, sample pH, sample temperature, mixing speed and extraction time have been evaluated and optimized. The amount of dissolved organic matter (DOM) and the salt content both affected SPME extraction efficiency, but the presence of other competitive extractants such as organochlorine pesticides (OCPs) in the matrix showed no insignificance interference. The limit of detection (LOD) for acetochlor, metolachlor and butachlor were 1.2, 1.6 and 2.7 ng L(-1), respectively. The recoveries for the herbicides ranged from 79 to 102%, and the linear dynamic range was from 10 to 1000 ng L(-1). The developed method has been used to monitor herbicides contaminations in coastal water samples collected around Laizhou bay and Jiaozhou bay in Shandong peninsula, China. The concentrations of acetochlor and metolachlor ranged from undetectable to 78.5 ng L(-1) and undetectable to 35.6 ng L(-1), respectively. Butachlor was not observed but in only one sample and the concentration is lower than the limit of quantification (LOQ). The concentrations of the three herbicides in this study are low compared to most of the other places reported.
Xu
Xiaoqin
X
Department of Chemistry and the Key Laboratory of Analytical Science of the Ministry of Education, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Yang
Huanghao
H
Wang
Ling
L
Han
Bin
B
Wang
Xiaoru
X
Lee
Frank Sen-Chun
FS
D000081:Acetamides / Q000032:analysis*; D000083:Acetanilides / Q000032:analysis*; D005618:Fresh Water / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D006540:Herbicides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D012623:Seawater / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods; D013696:Temperature; D013997:Time Factors; D014052:Toluidines / Q000032:analysis*
D000081:Acetamides; D000083:Acetanilides; D006540:Herbicides; D014052:Toluidines; C043377:acetochlor; C054409:butachlor; C051786:metolachlor