IJERPH, Vol. 14, Pages 1033: Migration and Accumulation of Octachlorodipropyl Ether in Soil-Tea Systems in Young and Old Tea Gardens

IJERPH, Vol. 14, Pages 1033: Migration and Accumulation of Octachlorodipropyl Ether in Soil-Tea Systems in Young and Old Tea Gardens

International Journal of Environmental Research and Public Health doi: 10.3390/ijerph14091033

Authors: Min Liao Yan-Hong Shi Hai-Qun Cao Qing-Kui Fang Jin-Jing Xiao Ri-Mao Hua

The migration and accumulation of octachlorodipropyl ether (OCDPE) in soil-tea systems were investigated using a gas chromatography-electron capture detector (GC-ECD) method in young and old tea gardens. When the residual concentration of OCDPE was 100 g a.i. hm−2 in soils, the peak concentrations of OCDPE in fresh leaves of young and old tea plants were 0.365 mg/kg and 0.144 mg/kg, taking 45 days and 55 days, respectively. Equations for the accumulation curves of OCDPE in fresh leaves of young and old tea plants were Ct = 0.0227e0.0566t (R2 = 0.9154) and Ct = 0.0298e−0.0306t (R2 = 0.7156), and were Ct = 3.8435e0.055t (R2 = 0.9698) and Ct = 1.5627e−0.048t (R2 = 0.9634) for dissipation curves, with a half-life of 14.4 days and 12.6 days, respectively. These results have practical guiding significance for controlling tea food safety.

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