Residue Dynamics and Risk Assessment of Prochloraz and Its Metabolite 2,4,6-Trichlorophenol in Apple
School of Plant Protection, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University, Hefei 230036, China
School of Resource & Environment, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University, Hefei 230036, China
Author to whom correspondence should be addressed.
Molecules 2017, 22(10), 1780; https://doi.org/10.3390/molecules22101780
Received: 22 September 2017 / Revised: 17 October 2017 / Accepted: 19 October 2017 / Published: 20 October 2017
The residue dynamics and risk assessment of prochloraz and its metabolite 2,4,6-trichlorophenol (2,4,6-TCP) in apple under different treatment concentrations were investigated using a GC-ECD method. The derivatization percent of prochloraz to 2,4,6-TCP was stable and complete. The recoveries of prochloraz and 2,4,6-TCP were 82.9%–114.4%, and the coefficients of variation (CV) were 0.7%–8.6% for the whole fruit, apple pulp, and apple peel samples. Under the application of 2 °C 2.0 g/L, 2 °C 1.0 g/L, 20 °C 2.0 g/L, and 20 °C 1.0 g/L treatment, the half-life for the degradation of prochloraz was 57.8–86.6 d in the whole fruit and apple peel, and the prochloraz concentration in the apple pulp increased gradually until a peak (0.72 mg·kg−1) was reached. The concentration of 2,4,6-TCP was below 0.1 mg·kg−1 in four treatment conditions and not detected (<LOD) in apple pulp. Finally, based on the detection of market samples in Hefei (China), we believe that the residual level of prochloraz in apples meets the requirements of the Chinese standards.