I work on agricultural and food chemistry, environmental analytical chemistry, and environmental toxicology at the University of Science and Technology Beijing (USTB), China. My study has focused on residue distribution, dissipation, risk assessment, abiotic and microbial degradation mechanisms, environmental behaviors, and toxic effects of pesticides and their transformation products over a decade. And now, my study interests are (1) degradation, transformation, and removal mechanism of emerging pollutants in environments, (2) dissipation, residue distribution, and risk assessment of emerging contaminants in field crops, (3) occurrence of pollutants and their transformation products in foods and environmental matrices, and (4) toxicological effects of emerging contaminants to non-target organisms.