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《Journal of Agro-Environment Science》 2011-11
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Concentration Characteristics and Historical Changes of Heavy Metals in Irrigation Sewage in China

XIN Shu-zhen, LI Hua-fen, SU De-chun* (College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China)  
Sewage irrigation is one of the main factors which could cause contamination of heavy metals in the farmland. In this study, we collected the published data concerning the concentrations of heavy metals in irrigation sewage all over the country from literature databases, then analyzed all the data and summarized the concentration characteristic of heavy metals and their historical changes in the past 30 years. The results showed that the mean or median values of Pb, Cr, Zn, Ni concentrations in the irrigation sewage decreased gradually with the age in the last three decades. The mean concentrations of Hg and As increased firstly and decreased then, however, the mean concentrations of Cu and Cd decreased at the beginning and increased afterwards. The mean concentrations of the eight heavy metals were all lower than the standards prescribed in "Standards for irrigation water quality"(GB 5084—2005)in nearly three decades, but about 10% of heavy metals concentrations were higher than this standard. About 25% of Hg, Pb, Cd concentrations in 1980—1989 were higher than the standard, 25% of Hg, Cr, As concentrations in 1990—1999 also higher than the standard and the same as 25% of Cd and As concentrations in 2000—2009. In summary, Hg, Cd and As should be considered as a priority in pollution source control of heavy metals in irrigation sewage.
【Fund】: 公益性行业(农业)科研专项(200903015);; 09科研院所项目(Z09040900930903)
【CateGory Index】: S273.5;X703
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