Monitoring of pesticide residues levels in fresh vegetable form Heibei Province, North China.In this study, 226 samples of seven types of domestic vegetables collected from several vegetable-growing regions in Hebei Province of China were tested for the presence of 38 different agricultural pesticides using a gas chromatograph equipped with electron capture and nitrogen phosphorus detectors. 
gas chromatograph
Monitoring of pesticide residues levels in fresh vegetable form Heibei Province, North China.In this study, 226 samples of seven types of domestic vegetables collected from several vegetable-growing regions in Hebei Province of China were tested for the presence of 38 different agricultural pesticides using a gas chromatograph equipped with electron capture and nitrogen phosphorus detectors. 
nitrogen phosphorus detector