乌达-乌斯太工业园大气颗粒物中汞的形态及空间分布特征

The species and spatial distribution characteristics of atmospheric particulate mercury in Wuda-Wusitai Industrial Park, China

利用碳质分析(OC/EC)、离子色谱分析(IC)、程序升温脱附分析(TPD)、成像分析等综合分析手段,对内蒙古乌达-乌斯太工业园大气细颗粒物中汞的具体存在形态和空间分布特征进行了研究.结果表明,乌达-乌斯太工业园PM2.5中Hg含量与有机碳(OC)、元素碳(EC)、Cl-和NO3-含量的相关性系数r分别为<0.1、<0.1、0.854和0.745.PM2.5中的汞以无机态为主,且可能以HgCl2、HgS、HgO和Hg(NO3)2·H2O为主要存在形态.PM2.5中汞含量相对富集区多分布在高Hg0浓度,高氯和高酸(硝酸)区域,表明排氯、排酸等工业活动与PM2.5中汞的形成具有重要的内在联系.

The Hg speciation in atmospheric particulates is an important issue to be elucidated in the field of atmospheric Hg.Carbon analytic(OC/EC),ion chromatography(IC),temperature-programmed desorption analysis(TPD),imaging analysis methods were used to analyze the specific existence and spatial distribution of Hg in PM2.5 at Wuda-Wusitai industrial park,Inner Mongolia.The results showed that the correlation coefficients(r)between Hg content and organic carbon(OC),elemental carbon(EC),Cl-and NO3-content in PM2.5 were<0.1,<0.1,0.854 and 0.745,respectively.Hg in the atmospheric particulates mainly existed in the forms of HgCl2,HgS,HgO and Hg(NO3)2·H2 O.The particulate Hg content was more concentrated in the high Hg0 concentration,high chlorine and high acid(nitric acid)regions.The results indicated that industrial activities such as chlorine and acid discharge might play an important role in the enrichment of mercury in atmospheric particulates.