Preparation of ortho-hydroxyl/carboxyl dual-functionalized hypercrosslinked polymers for highly efficient enrichment of nitrosamines with broad polarity prior to gas chromatography-mass spectrometry analysis

• Kai YangNorthwest University
• Xiaoqing ZhangNorthwest University
• Jiwei ShenNorthwest University
• Yinmao WeiNorthwest University
• Chaozhan WangNorthwest University