江苏省淮安市大气中德克隆浓度水平及时空分布特征

Concentration Level and Spatial-Temporal Variation Characteristics of Dechlorane Plus in the Atmosphere in Huai′an City,Jiangsu Province

为评估淮安市大气中DP(德克隆)的水平及分布特征,于2016-2018年采用大气被动采样方法,共收集了96个大气样品,对大气中ρ(DP)、ρ(syn-DP)(syn-DP为顺式DP)和ρ(anti-DP)(anti-DP为反式DP)进行分析,结合fsyn[ρ(syn-DP)占ρ(DP)的比例]分布模式,追溯大气中DP的迁移转化规律.结果表明:①所有样品中均检出DP,厂界内大气中ρ(DP)范围为1925~4221 pg/m3,平均值为3053 pg/m3;除厂界内采样点外,其他采样点大气中ρ(DP)范围为9~92 pg/m3,平均值为42 pg/m3.②ρ(DP)最高值出现在厂界内采样点,其ρ(DP)比厂界外采样点高约3个数量级.③大气中ρ(DP)分布受季节性影响较为明显,呈冬季高、夏季低的特征.④厂界内采样点fsyn平均值为0.26,厂界外采样点的fsyn值在0.18~0.53之间,平均值为0.28,与厂界内采样点大气中DP的fsyn平均值相当.研究显示,淮安市大气中的高水平DP主要来源于DP生产,fsyn值受季节和空间变化的影响.

In order to evaluate the level and distribution characteristics of Dechlorane Plus(DP)in the atmosphere of Huai′an City,96 atmospheric samples were collected using atmospheric passive sampling method from 2016 to 2018.Theρ(DP),ρ(syn-DP),andρ(anti-DP)were analyzed,and the mass fraction of syn-DP isomers(f syn)was combined to trace the migration and transformation of DP in the atmosphere.The result showed that:(1)DP was detected in all samples.The range ofρ(DP)in the atmosphere was 1925-4221 pg m 3,with an average of 3053 pg m 3.In addition to the sampling sites in the plant,the range ofρ(DP)in the atmosphere at other sampling sites was 9-92 pg m 3,with an average of 42 pg m 3.(2)The highest value ofρ(DP)appeared in the plant,and itsρ(DP)was about three orders of magnitude higher than the sampling sites outside the plant.(3)The distribution ofρ(DP)in the atmosphere was related to the seasons,showing the characteristics of high in winter and low in summer.(4)The average f syn value at the sampling points in the plant area was 0.26,and the average f syn value at the sampling point outside the plant area was ranged from 0.18 to 0.53,with an average of 0.28,which was equivalent to the average f syn value of the sampling points in the plant area.This study showed that the high levels of DP in the atmosphere of Huai′an City mainly came from the production of DP,and the f syn values of syn-DP and anti-DP demonstrated seasonal and spatial variations.