【摘要】：為了解PM_(2.5)、PM_(10)和降塵中Cu、Mn、Pb、Ti、V、Cd、Cr、Co、Mo、Ni等10種重金屬元素的分布特征及人體健康風(fēng)險,利用大流量顆粒物采樣器采集了北京城區(qū)某地四季大氣中PM_(2.5)、PM_(10)及降塵樣品,用ICP-MS測定了上述10種金屬元素的質(zhì)量濃度.結(jié)果表明,PM_(2.5)和PM_(10)的年均質(zhì)量濃度分別為153.40μg·m~(-3)和232.93μg·m~(-3),超出GB 3095-2012中二類環(huán)境功能區(qū)標(biāo)準(zhǔn)限值的5倍和3倍;PM_(2.5)/PM_(10)的均值為0.74,表明大氣顆粒物中以粒徑小于2.5μm的顆粒為主;后向軌跡分析結(jié)果表明外源顆粒物的來向隨季節(jié)變化而改變,冬、春、夏、秋季主要來向為西北、北-東北、東南、東南-西北.PM_(2.5)和PM_(10)中10種元素的年均質(zhì)量濃度從高到低依次為TiMnPbCuCrNiVCdMoCo,其中Ti、Mn、Pb、Cu和Cr這5種元素占10種目標(biāo)元素總質(zhì)量濃度的91.93%和92.49%.除PM_(10)中Cd年均質(zhì)量濃度(6.53 ng·m~(-3))高于GB 3095-2012限定值(5.00 ng·m~(-3))外,其他元素的質(zhì)量濃度均不超標(biāo).降塵中各元素的含量由高到低依次為TiMnPbCuNiCrVCoMoCd,Ti(2561.48μg·g~(-1))占所有元素的質(zhì)量分?jǐn)?shù)為72.57%,地累積指數(shù)(Igeo)結(jié)果表明,Cd(4.03)屬重度污染,Pb(2.49)介于中度污染和重度污染之間,Cu(1.33)屬中度污染,Ni(0.43)屬輕微污染.重金屬的致癌健康風(fēng)險(10-4)和非致癌健康風(fēng)險(1),均處于較低水平,短期內(nèi)不會對人體健康造成威脅,但不能忽視長期處于此環(huán)境所帶來的健康危害.
[Abstract]:In order to understand the distribution characteristics and human health risks of 10 heavy metal elements such as PM_ (2.5), PM_ (10) and Cu,Mn,Pb,Ti,V,Cd,Cr,Co,Mo,Ni in dust reduction, PM_ (2.5), PM_ (10) and dust samples in the atmosphere of a certain place in Beijing were collected by large flow particle sampler. The mass concentrations of the above 10 metal elements were determined by ICP-MS. The results show that the average annual mass concentrations of PM_ (2.5) and PM_ (10) are 153.40 渭 g 路m ~ (- 3) and 232.93 渭 g 路m ~ (- 3), respectively, which are 5 times and 3 times higher than the standard limits of the second type of environmental functional areas in GB 3095 鈮，

本文編號：2497828