引用本文:蒋荣,李敏娜.南通市不同空气质量级别对应的EC和OC变化特征[J].环境监控与预警,2018,10(2):49-53
JIANG Rong, LI Min-na.Variation Characteristics of EC and OC in Different Air Quality Grades in Nantong[J].Environmental Monitoring and Forewarning,2018,10(2):49-53
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南通市不同空气质量级别对应的EC和OC变化特征
蒋荣,李敏娜
南通市环境监测中心站,江苏 南通 226006
摘要:
采用EC/OC在线分析仪和空气自动站连续监测数据(2016年3月—2017年2月),对南通市不同空气质量级别下的EC、OC变化特征进行了分析。结果表明, EC、OC小时均值分别为1.25~6.55,4.16~24.90 μg/m3,与空气质量级别呈正相关(r=0.999,0.963,p<0.01);ρ(EC)/ρ(PM2.5)、ρ(OC)/ρ(PM2.5)分别为3.54%~6.64%,11.53%~22.18%,总体随空气质量级别的升高而下降,存在明显二次有机碳(SOC)污染,ρ(SOC)为2.29~14.18 μg/m3,与空气质量级别呈正相关(r=0.921,p<0.05);ρ(SOC)/ρ(PM2.5)为5.44%~12.22%,总体随空气质量级别的升高而下降。“优”—“轻”空气质量级别下,EC小时值日变化曲线呈双峰型,OC小时值日变化曲线呈单峰型,“中”“重”空气质量级别下,EC、OC小时值日变化规律不明显。“优、良、中、重” 空气质量级别下的EC和各空气质量级别下的OC的季节平均值均为夏季最高,其余季节分布规律不明显,EC、OC总均值季节分布为:夏>冬>春>秋。
关键词:  有机碳  元素碳  空气质量级别  南通市
DOI:
分类号:X513
文献标识码:B
基金项目:
Variation Characteristics of EC and OC in Different Air Quality Grades in Nantong
JIANG Rong, LI Min-na
Nantong Environmental Monitoring Center, Nantong, Jiangsu 226006,China
Abstract:
Variation characteristics of EC and OC in different air quality grades in Nantong were analyzed by using continuous monitoring data from EC/OC on line analyzer and automatic air monitoring station(March 2016 to February 2017). Results showed that the hourly mean concentration of EC and OC are 1.25~6.55 and 4.16~24.90 μg/m3 respectively. There is a positive relationship between hourly concentration of EC and OC and the level of air quality(r=0.999,0.963,p<0.01). ρ(EC)/ρ(PM2.5)and ρ(OC)/ρ(PM2.5) are 3.54%~6.64% and 11.53%~22.18% respectively, which decrease with the risen of the level of air quality in general. There is an obvious SOC pollution in Nantong. Its concentration is 2.29~14.18 μg/m3, which is positive correlated with the air quality level(r=0.921,p<0.05). ρ(SOC)/ρ(PM2.5)is 5.44%~12.22%, which decreases with the risen of the level of air quality generally. During fine to mild air quality level, the daily change curve of the hourly concentration of EC shows bimodal type, and the daily change curve of the hourly concentration of OC shows unimodal type. While during middle level pollution and heavy pollution, there isn't an obvious daily change rule of daily change curve of the hourly concentration of EC and OC. Except EC in mild air quality level, the concentration of EC and OC are highest in summer in different air quality grades. There isnt an obvious regularity distribution in other seasons. The seasonal changes of EC and OC average concentration of all air quality grades follow the trend,Summer >Winter>Spring>Fall.
Key words:  Organic carbon  Elemental carbon  Air quality grades  Nantong