引用本文:和凌红,陈颂,潘润西,陈蓓,李龙云.广西环境空气中醛酮类化合物污染特征研究[J].环境监控与预警,2024,(3):79-85
HE Linghong,CHEN Song,PAN Runxi,CHEN Bei,LI Longyun.Study on Pollution Characteristics of Aldehydes and Ketones in Guangxi[J].Environmental Monitoring and Forewarning,2024,(3):79-85
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广西环境空气中醛酮类化合物污染特征研究
和凌红1,陈颂2,潘润西1,陈蓓1*,李龙云3
1.广西壮族自治区生态环境监测中心,广西 南宁 530028;2.南京科略环境科技有限责任公司,江苏 南京 210000;3.南京天朗环境检测有限公司,江苏 南京 210000
摘要:
为探究广西醛酮类化合物的污染状况,选择2022年9—10月和2023年5—6月臭氧质量浓度较高时段,分别对广西臭氧质量浓度较高的典型城市如南宁、桂林、北海、贵港、百色、贺州和来宾等城市的环境空气中醛酮类化合物进行监测,分析不同城市醛酮类化合物的季节特征、浓度水平、组分特征以及臭氧生成潜势(OFP),并利用比值法对醛酮类化合物的来源进行初判。研究结果表明,南宁、桂林和来宾等典型城市醛酮类化合物质量浓度季节特征与臭氧一致,均表现为秋季(2022年9—10月)高于春夏季(2023年5—6月);监测期间,广西醛酮类物质平均质量浓度为23.64 μg/m3,其中贺州最高,为31.30 μg/m3,北海最低,为13.58 μg/m3,与其他城市相比,广西各市醛酮类化合物质量浓度处于中等偏下水平;各城市的醛酮类化合物化学组分中甲醛占比最高,占比为43.8%(贺州)~58.2%(贵港);各城市OFP值为77.32μg/m3(北海)~ 159.35 μg/m3(贵港),其中甲醛对OFP贡献最大,贡献占比为52.1%(北海)~70.1%(贵港)。各城市甲醛和乙醛的质量浓度比值(C1/C2)为2.55~3.22,醛酮类化合物主要以机动车尾气排放以及人为源碳氢化合物氧化为主,其中北海和百色的C1/C2均在2.6左右,受机动车尾气等人为源影响更明显,在臭氧污染期间须加强机动车尾气等人为源管控。
关键词:  环境空气  醛酮类化合物  污染特征  臭氧  前体物
DOI:DOI:10.3969/j.issn.1674-6732.2024.03.013
分类号:X51
基金项目:广西重点研发计划项目(桂科AB20238015)
Study on Pollution Characteristics of Aldehydes and Ketones in Guangxi
HE Linghong1, CHEN Song2, PAN Runxi1, CHEN Bei1*, LI Longyun3
1.Ecological Environmental monitoring Center of Guangxi Zhuang Autonomous Region, Nanning, Guangxi 530028, China; 2.Nanjing Intelligent Environmental Science And Technology Co., Ltd., Nanjing, Jiangsu 210000, China; 3.Nanjing Tianlang Environmental Testing Co., Ltd. Nanjing, Jiangsu 210000, China
Abstract:
In order to investigate the pollution of aldehydes and ketones in Guangxi, the aldehydes and ketones in ambient air in typical cities, including Nanning, Guilin, Beihai, Guigang, Baise, Hezhou and Laibin, were monitored from September to October 2022 and from May to June 2023. The concentration level, component characteristics and the ozone formation potential(OFP) of the main aldehydes and ketones in different cities were analyzed, and the source of aldehydes and ketones were analyzed by the ratio method. The study showed that the typical cities in Guangxi, such as Nanning, Guilin and Laibin, exhibited a similar seasonal pattern of aldehydes and ketones mass concentrations to ozone with higher concentrations in autumn(September October 2022) compared to spring and summer(May—June 2023). During the monitoring period, the average concentration of aldehydes and ketones in Guangxi was 23.64 μg/m3, with the highest concentration in Hezhou(31.30 μg/m3) and the lowest concentration in Beihai(13.58 μg/m3). Compared with other cities, the concentration level of aldehydes and ketones in ambient air in cities of Guangxi was below average. Formaldehyde accounted for the highest proportion, ranged from 43.8% to 58.2%. The OFP in each city ranged from 77.32 μg/m3(Beihai) to 159.35 μg/m3(Guigang), among them, formaldehyde contributed the most to OFP, accounting for 52.1%~70.1%. The ratio of formaldehyde to acetaldehyde(C1/C2) in seven cities ranged from 2.55 to 3.22, indicating aldehydes and ketones originate from vehicle exhaust emissions and anthropogenic sources of hydrocarbon oxidation. Notably, Beihai and Baise had C1/C2 ratio around 2.6, indicating a more significant impact from vehicle exhaust and other anthropogenic source, it is necessary to strengthen the control of relevant emission source during ozone pollution.
Key words:  Ambient air  Aldehyde and ketones  Pollution characteristics  Ozone  Precursors