Simultaneous Determination of Four Antifouling Biocides in Marine Coatings by Gas Chromatography-Mass Spectroscopy

KeyWord:marine coatings  antifouling biocides  chlorothalonil  dichlofluanid  Sea-Nine 211  Irgarol 1051  gas chromatography-mass spectrometry£¨GC-MS£©

Abstract:

      A gas chromatography-mass spectrometric£¨GC-MS£©method was developed for the simultaneous determination of 4 kinds of antifouling biocides£¬including chlorothalonil£¬dichlofluanid£¬Sea-Nine 211 and Irgarol 1051 in marine coatings.The samples were extracted by ultrasonic method using ethyl acetate as solvent at room temperature£¬and the solid impurities were removed from the solution through the organic membrane£¬and then the target compounds were determined by GC-MS in selected ion monoitoring mode£¨SIM£©.Under the optimal conditions£¬The standard calibration curves of chlorothalonil£¬dichlofluanid£¬Sea-Nine 211 and Irgarol 1051 were linear over the assayed range with correlation coefficients higher than 0.99.The detection limits£¨LOD£¬S/N¡Ý3£© ranged from 0.3 mg/kg to 1.3 mg/kg£¬and the limits of quantitation£¨LOQ£¬S/N¡Ý10£© ranged from 1.0 mg/kg to 4.3 mg/kg.The recoveries of the analytes in spiked samples ranged from 82.6% to 109.9%£¬with relative standard deviations£¨RSDs£© less than 5%£¬The proposed method was applied in the determination of antifouling biocides in 6 commercially available marine antifouling coatings£¬and two of which were detected containing chlorothalonil£¬dichlofluanid and Sea-Nine 211£¬respectively.The method could meet the requirements for rapid and accuate determination of 4 antifouling biocides in marine coatings.