Research on the spatiotemporal variation characteristics of air pollutants in a chemical industrial park in Zhejiang based on air quality monitoring micro station network
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摘要: 基于30个微型空气质量监测站组建的大气污染物监测网络,对浙江某精细化工园区中的大气污染物开展长期监测研究。结果显示:1)O3浓度呈双峰变化,峰值出现在4月(83.8 μg/m3)和9月(84.5 μg/m3);NO2浓度在冬季高于夏季,年均浓度主要集中在4~28 μg/m3之间;TVOCs变化呈单峰趋势,在8月到达峰值,平均浓度为1954 μg/m3;由于较好的气象扩散条件,PM10和PM2.5的浓度变化趋势较为一致,二者均在12月浓度最高。2)O3浓度的高值区域主要集中在园区北部;NO2的时空分布特征与O3呈显著负相关,O3浓度高的地区NO2的浓度较低;TVOCs的空间分布态势在全年并无显著差异,主要集中在园区南部和东北部;PM高值区域主要分布在园区中部。3)受疫情影响,NO2和PM的浓度在管控期间低于管控之前,而O3浓度则因其前体物的影响使得管控期间的浓度高于管控之前。4)根据皮尔逊相关系数,风速的长期迁移和高温会促进O3的形成;由空间分布和NO2与TVOCs的比率可知,精细化工园区中O3 的形成受NO2限制,降低环境NO2浓度是减少园区中O3浓度的有效策略。Abstract: The chemical industry park has the characteristics of large scale, gathering enterprises, dense distribution, large quantity of dangerous chemicals, complex production process and so on. Based on the air pollutant monitoring network consists of 30 micro air quality monitoring stations, a long-term monitoring study of air pollutants in a fine chemical industrial park in Zhejiang province was carried out. The results showed that: 1) O3 concentration showed a bimodal change, and the peak appeared in April (83.8 μg/m3) and September (84.5 μg/m3). The concentration of NO2 in winter was higher than that in summer, and the average annual concentration was mainly between 4 μg/m3 and 28 μg/m3. TVOCs showed a unimodal trend and reached the peak in August, with an average concentration of 1954 μg/m3. Due to the favorable meteorological diffusion conditions, the concentrations of PM10 and PM2.5 had the same trend, and both had the highest concentration in December. 2) The high O3 concentration area was mainly concentrated in the north of the park; the spatiotemporal distribution characteristics of NO2 were significantly negatively correlated with O3, and the concentration of NO2 was lower in areas with high O3 concentration. There was no significant difference in the spatial distribution of TVOCs throughout the year, mainly concentrated in the south and northeast of the park; the areas with high PM values were mainly distributed in the middle of the park. 3) Influenced by the epidemic, the concentrations of NO2 and PM were lower than those before the control period, while the concentration of O3 was higher than that before the control period due to the influence of its precursors. 4) According to the Pearson correlation coefficient, the long-term migration of wind speed and high temperature would promote the formation of O3; according to the spatial distribution and the ratio of NO2 to TVOCs, the formation of O3 in the fine chemical industrial park was limited by NO2, and reducing the ambient NO2 concentration should be an effective strategy to reduce the O3 concentration in the park.
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1 气体传感器技术参数
1. Technical parameters of the gas sensors
监测目标 原理 检出限 偏差/% 响应时间/s PM 光散射 0~1500 μg/m3 — — NO2 电化学 0~500 μg/m3 10 ≤120 O3 电化学 0~500 μg/m3 10 ≤120 TVOCs 光离子化 0~10 mg/m3 10 ≤120 2 空气污染物浓度与风速、温度、相对湿度之间的皮尔逊相关系数
2. Pearson correlation coefficients between air pollutants concentrations and wind speed, temperature, and humidity
项目 PM2.5 PM10 NO2 O3 TVOCs 风速 冬季 -0.22 -0.10 -0.21 0.35 -0.22 春季 -0.05a -0.02 -0.16b 0.22b -0.00 夏季 -0.23b -0.21b -0.27b 0.34b -0.23b 秋季 -0.25b -0.27b -0.03 0.05a -0.43b 温度 冬季 -0.58b -0.43a -0.02 0.21 0.16 春季 0.04 0.07b -0.27b 0.54b 0.35b 夏季 -0.07b -0.04a 0.46b 0.41b 0.07b 秋季 0.05a -0.12b -0.40b 0.70b 0.65b RH 冬季 0.61b 0.53b 0.38 -0.49a 0.25 春季 0.04 0.00 0.08b -0.62b 0.46b 夏季 0.16b 0.11b 0.54b -0.44b 0.10b 秋季 0.13b 0.05a 0.24b -0.66 0.10b 注:a表示相关性在0.05水平上显著;b表示相关性在0.01水平上显著。 -
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