Derivatization and Determination of MCPA in Soil by GC
2010
Cai, Kai | Zhang, Yu-Ping | Bhadury, Pinaki S | Liu, Bin | Hu, De-Yu | Xu, Weiming
A reliable and sensitive method for determination of MCPA in soil by derivatization through p-toluenesulfonic acid and 1,3-dichloro-2-propanol followed by gas chromatographic detection under ECD mode has been established. After treatment with hydrochloric acid, the soil samples were directly extracted without any clean-up with dichloromethane by vortexing. After derivatization and liquid-liquid extraction, the product was subjected to GC analysis. Under optimized conditions, recovery of MCPA reached 87-91%; intra- and inter-day precision values were recorded in the range 3.4-6.4% and 7.4-8.7%, respectively. Excellent linear relationship was observed within 0.1-10 μg mL⁻¹ (0.005-0.5 mg kg⁻¹) with linear correlation coefficient (R) of 0.9997. The LOD and LOQ were 0.001 and 0.0026 mg kg⁻¹, respectively, and the overall sensitivity for detection was found to be in the same range as with the conventional GC-MS technique.
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