不同空气质量等级下环境空气颗粒物及其碳组分变化特征

发布时间：2018-05-04 04:28

本文选题：空气质量等级 + 颗粒物　；参考：《环境科学》2017年09期

【摘要】：为研究不同空气质量等级下环境空气颗粒物及其碳组分变化特征,于2016年3月在廊坊市对环境空气中PM_(10)、PM_(2.5)和PM1质量浓度及PM_(2.5)中碳组分质量浓度进行了在线监测.结果表明,监测期间廊坊市PM_(10)、PM_(2.5)和PM1质量浓度较高,其分别为204.1、107.9和87.8μg·m~(-3),日变化趋势呈双峰型分布.总体来说,当空气质量越好,PM_(10)、PM_(2.5)、PM1及其碳组分(OC、EC、SOC和POC)质量浓度越低,PM1/PM_(2.5)、PM1/PM_(10)和PM_(2.5)/PM_(10)比值越小.但"中度污染"时,PM_(10)质量浓度最高,且PM1/PM_(10)和PM_(2.5)/PM_(10)达到谷底值;同时OC质量浓度比"轻度污染"略低,而明显低于"重度污染",且主要出现在13:00~23:00,表明"中度污染"时细颗粒物和超细颗粒物占比下降,与其对应的首要污染物相一致.此外,OC/EC比值大于2.0,通过最小OC/EC比值法估算PM_(2.5)中SOC和POC,其浓度均值分别为12.2μg·m~(-3)和5.0μg·m~(-3).
[Abstract]:In order to study the variation characteristics of ambient air particles and their carbon components under different air quality grades, in March 2016, the mass concentration of PM_ (10), PM_ (2.5) and PM1 concentration and PM_ (2.5) in the ambient air were monitored on line in Langfang. The results showed that the mass concentration of PM_ (10), PM_ (2.5) and PM1 in Langfang was higher during the monitoring period. 204.1107.9 and 87.8 g m~ (-3) were distributed in Shuangfeng type, respectively. As a whole, the better the air quality, PM_ (10), PM_ (2.5), PM1 and its carbon components (OC, EC, SOC and POC), the lower the mass concentration, the smaller the PM1/PM_ (2.5), 10 and 2.5 (10), but the highest concentration (10), and 10 (10) when "moderate pollution". PM_ (2.5) /PM_ (10) reached the bottom of the valley, and the mass concentration of OC was slightly lower than "mild pollution", and obviously lower than "severe pollution", and it appeared mainly in 13:00~23:00. It showed that the ratio of fine particles and ultrafine particles decreased when "moderate pollution", and the ratio of OC/EC was greater than 2, and it was estimated by the minimum OC/EC ratio method. The average concentrations of SOC and POC in PM_ (2.5) are 12.2 g g m~ (-3) and 5 g g m~ (-3) respectively.

【作者单位】：南开大学环境科学与工程学院城市交通污染防治研究中心;廊坊市海宏环保科技有限公司;
【基金】：国际科技支撑计划项目(2014BAC23B02) 科技基础性工作专项(2013FY112700-05)
【分类号】：X513

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