title: [Concentrations and Speciation of Dissolved Heavy Metal in Rainwater in Guiyang, China].
abstract: In order to understand the pollution situation, as well as seasonal changes in characteristics and speciation of dissolved heavy metals in acid rain control zone, the concentrations of dissolved heavy metals in rainwater collected at Guiyang were measured using inductively coupled plasma mass spectrometry (ICP-MS). And the speciation of dissolved heavy metals was further simulated by PHREEQC model. The results showed that the dissolved Co, Ni, Cu, Zn and Cd concentrations were low and not higher than the national standards for drinking water quality in China. The dissolved Pd concentrations were high in fall and winter and higher than the national standards for drinking water quality in China. The Co and Ni in rainwater mainly came from the crust and there was almost no human impact. The Cu, Zn, Cd and Pd pollutions in rainwater were affected by human activity with different levels. The degrees of contamination in autumn and winter were more serious than those in spring and summer. The free metal ion species was the dominant form of dissolved heavy metal, accounting for 47.27%-95.28% of the dissolved metal in rainwater from Guiyang city. The free metal ion species was followed in abundance by Metal-Oxalate and Metal-sulfate complexes that accounted for 0.72% -51.87% and 0.50%-7.66%, respectively. The acidity of rainwater, acid type as well as content of ligand more likely controlled the distribution of dissolved heavy metal in precipitation.
authors.forename: Zhao-zhou
authors.initials: ZZ
authors.lastname: Zhu
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Zhi-ru
authors.initials: ZR
authors.lastname: Wang
mesh_terms: D015258:Acid Rain; D002681:China; D002947:Cities; D004784:Environmental Monitoring; D019216:Metals, Heavy / Q000032:analysis*; D012621:Seasons; D060753:Water Quality
chemical_list: D015258:Acid Rain; D019216:Metals, Heavy