Tianjin Key Laboratory of Water Environment and Water Resource, Tianjin Normal University, 300387, Tianjin, People's Republic of China.
Bull Environ Contam Toxicol. 2010 Mar;84(3):336-41. doi: 10.1007/s00128-010-9939-6. Epub 2010 Jan 29.
We investigated the concentrations of Hg, Cd, Pb and As in samples of irrigation water, sediment, soil and groundwater from a field in Tianjin that was irrigated with wastewater. The results showed that the concentrations (Hg, 0.82 microg/L; Cd, 0.18 microg/L; Pb, 1.5 microg/L; As, 8.02 microg/L) in the irrigation water did not exceed the China Surface Water Quality Standard or the maximum concentrations in irrigation water recommended by the FAO. The concentrations of metals in the groundwater of wells (Hg, 0.016 microg/L; Cd, 0.128 microg/L; Pb, 0.25 microg/L; As, 4.65 microg/L) were lower than China Groundwater Quality Standard and the WHO guideline values for drinking water. The groundwater had not yet been contaminated through vertical infiltration-induced leaching. However, a substantial buildup of Hg and Cd in river sediments (I(geo) for Hg and Cd; 5.24 and 3.04, respectively) and wastewater-irrigated soils (I(geo) for Hg and Cd; 2.50 and 3.09, respectively) was observed. Taken together, these results indicated that irrigation with wastewater damaged the soil quality over the long term and that metals more easily accumulated in vegetable fields than rice fields.
我们调查了天津某农田灌溉废水中 Hg、Cd、Pb 和 As 的灌溉水、沉积物、土壤和地下水样本的浓度。结果表明，灌溉水中的浓度（Hg，0.82μg/L；Cd，0.18μg/L；Pb，1.5μg/L；As，8.02μg/L）未超过中国地表水质量标准或 FAO 推荐的灌溉水最大浓度。井水地下水（Hg，0.016μg/L；Cd，0.128μg/L；Pb，0.25μg/L；As，4.65μg/L）中金属浓度低于中国地下水质量标准和世卫组织饮用水指导值。地下水尚未通过垂直渗透诱导淋滤受到污染。然而，河沉积物（Hg 和 Cd 的 Igeo；分别为 5.24 和 3.04）和废水灌溉土壤（Hg 和 Cd 的 Igeo；分别为 2.50 和 3.09）中 Hg 和 Cd 大量积累。综合这些结果表明，长期灌溉废水会损害土壤质量，而且金属在蔬菜田中比在水稻田中更容易积累。
