• 关键词：在线  挥发性有机物  源解析  健康风险评价  致癌风险

• 基金项目：国家重点研发计划项目（No.2017YFC0212403）

• 张栋
• 郑州大学化学学院, 环境科学研究院, 郑州 450001

• 于世杰
• 郑州大学化学学院, 环境科学研究院, 郑州 450001

• 王楠
• 河南省环境监测中心, 郑州 450000

• 马双良
• 河南省环境监测中心, 郑州 450000

• 王维思
• 河南省环境监测中心, 郑州 450000

• 尹沙沙
• 郑州大学化学学院, 环境科学研究院, 郑州 450001

• 李一丹
• 郑州大学化学学院, 环境科学研究院, 郑州 450001

• 郭旺
• 郑州大学化学学院, 环境科学研究院, 郑州 450001

• 张瑞芹
• 郑州大学化学学院, 环境科学研究院, 郑州 450001

• 摘要：采用GC5000在线气相色谱仪于2018年1月8—26日对郑州市城区进行大气环境挥发性有机化合物（VOCs）监测，开展污染特征分析、来源解析和苯系物（BTEX）健康风险评估.结果表明，监测期间郑州市城区TVOC平均浓度为64×10^-9，污染期时段平均浓度为84×10^-9，约是非污染时段的2倍；组分构成显示烷烃占比最大，其次是烯炔烃和芳香烃；源解析结果显示，VOCs主要来源是液化石油气/天然气（25%）、机动车尾气（24%）、燃烧（21%）、工业排放（16%）和溶剂使用（14%）；监测期间苯系物非致癌风险危害值（HQ）在美国环保署规定的安全范围内，苯的致癌风险（R）为2.2×10^-6，超过了美国环保署规定的安全阈值（1.0×10^-6）.对成年人存在致癌风险，需要引起关注.

• Abstract：In this study, ambient volatile organic compounds (VOCs) in January 8—26, 2018 were determined by GC 5000 online gas chromatography in urban site of Zhengzhou. The characteristics of VOCs, source appointment and health risk of benzene series were analyzed. Results showed that during the observation period, the mixing ratios of TVOC in urban area was 64×10^-9. The value was up to 84×10^-9 during the pollution period, which was more than twice as that during non-pollution period. Alkane was the most abundant component of VOCs, followed by alkenes and aromatics. Source apportionment results indicated that ambient VOC was mainly affected by natural gas and liquefied petroleum gas (25%), motor vehicle exhaust (24%), fuel combustion (21%), industrial emission (16%) and solvent use (14%). The noncarcinogenic risk hazard quotient value were within the safe range specified by United States (U.S.) Environmental Protection Agency (EPA), however, the carcinogenic risk of benzene was 2.2×10^-6, which was beyond the safety threshold of U.S. EPA (1.0×10^-6). There is potential cancer risk for adults, which should be concern.

• Key words：online  volatile organic compounds  source apportionment  health risk assessment  carcinogenic risk

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