Dufka Michaela, Dočekal Bohumil
Institute of Analytical Chemistry of the Czech Academy of Sciences, v.v.i., Veveří 97, 602 00 Brno, Czech Republic.
J Anal Methods Chem. 2018 Feb 5;2018:9698710. doi: 10.1155/2018/9698710. eCollection 2018.
A diffusive gradient in thin films (DGT) technique was employed in characterization of the particulate matter related to the urban area suffering from heavy traffic. Kinetics of mobilization metals fluxes from the metal-contaminated particulate matter was investigated. To monitor responses of the particulate matter sample, DGT probes of various thickness of diffusion layer were deployed in aqueous model suspensions of the particulate matter for different time periods. Particulate matter samples and exposed DGT resin gels were decomposed in a mixture of nitric and hydrochloric acid in a microwave pressurized PTFE-lined system. Total content of some traffic-related elements (Cd, Co, Cu, Mo, Ni, Pb, Pd, Pt, Rh, Sb, and V) was determined by inductively coupled plasma mass spectrometry. DGT measurements revealed that two metals pools associated with particles could be recognized, which can be characterized as high soluble fraction and almost insoluble fraction. DGT-measured metal fluxes from the labile pool showed significant difference in mobilization and resupply fluxes of individual selected elements, which might reflect the origin of selected metals and their speciation in particulate matter. The DGT technique can be applied as a useful tool for characterization of metals mobilization from the particulate matter.
采用薄膜扩散梯度（DGT）技术对与交通繁忙的市区相关的颗粒物进行表征。研究了金属污染颗粒物中迁移金属通量的动力学。为监测颗粒物样品的响应，将不同扩散层厚度的DGT探针部署在颗粒物的水相模型悬浮液中不同时间段。颗粒物样品和暴露的DGT树脂凝胶在微波加压聚四氟乙烯内衬系统中用硝酸和盐酸的混合物分解。通过电感耦合等离子体质谱法测定一些与交通相关元素（镉、钴、铜、钼、镍、铅、钯、铂、铑、锑和钒）的总含量。DGT测量表明，可以识别与颗粒相关的两个金属库，其可表征为高可溶性部分和几乎不溶性部分。从不稳定库中DGT测量的金属通量显示，所选单个元素的迁移和再供应通量存在显著差异，这可能反映了所选金属的来源及其在颗粒物中的形态。DGT技术可作为表征颗粒物中金属迁移的有用工具。
