N - dimethyl nitrosamine in food was extracted by Dichloromethane and determined by SIM with gas chromatography - mass spectrometry.
用二氯甲烷对各类食品中的N - 二甲基亚硝胺进行提取,利用气质联用仪采用选择离子法(SIM)进行定性定量检测.
People in the high - incidence area gastric nitrosamine compounds were significantly lower than the district.
高发区人胃液中亚硝胺类化合物含量明显高于低发区.