Abstract：PM2.5 samples were collected at Tsinghua University by SASS sampler in winter 2011. Heavy metals and water-soluble heavy metals of As, Cd, Cr, Cu, Mn, Pb and Zn, as well as water inorganic soluble ions were analyzed. The results indicated that the concentrations of water-soluble heavy metals were at high levels during the sampling period. The average concentrations of water-soluble heavy metals of As, Cd, Cr, Cu, Mn, Pb and Zn were 8.42, 3.18, 1.99, 7.84, 30.82, 49.27 and 412.81ng/m3, respectively. The average concentrations of Cd and water-soluble As exceeded the National Proposed Standard of Ambient Air Quality Standard, more attention should be paid to these two elements. Water-soluble heavy metals were enhanced during heavily polluted episodes. Compared with non-haze and non-heating period, water-soluble As, Cd, Cr, Cu, Mn, Pb and Zn increased during haze days and heating period. The variations of water-soluble heavy metals tracked well with those of total heavy metals and PM2.5. The fractions of water-soluble heavy metals in total heavy metals were 350% for Zn and As; <20% and ￡50% for V, Mn, Se, Sr, Cd, Sb; and ￡20% for the rest elements. The water-soluble Zn contributing up to 66.8% of the total Zn was of particular concern due to its high concentration level and toxicity. The water-solubility of Cd, Mn and Pb was stable during different pollution conditions, whereas it was less stable for As, Cr, Cu and Zn. During the study period, the water-solubility of Cd, Cr, Cu, Fe, Mn, Pb and Zn increased as a function of neutralization ratio (NR), whereas, As showed an opposite trend.
王晴晴, 马永亮, 谭吉华, 杨复沫, 韦莲芳, 段菁春, 贺克斌. 北京市冬季PM2.5中水溶性重金属污染特征[J]. 中国环境科学, 2014, 34(9): 2204-2210.
WANG Qing-Qing, MA Yong-Liang, TAN Ji-Hua, YANG Fu-Mo, WEI Lian-Fang, DUAN Jing-Chun, HE Ke-Bin. Characterization of water-soluble heavy metals of PM2.5 during winter in Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(9): 2204-2210.
