Torri S I, Lavado R S
Cátedra de Fertilidad, Facultad de Agronomía, UBA, Avda San Martín 4453, Buenos Aires (C1417 DSE), Argentina.
Waste Manag. 2008;28(5):821-32. doi: 10.1016/j.wasman.2007.01.020. Epub 2007 May 8.
A greenhouse experiment was set up to study the distribution of Cd, Cu and Pb in three typical soils of the Pampas Region amended with sewage sludge. A sequential extraction procedure was used to obtain four operationally defined geochemical species: exchangeable, bound to organic matter, bound to carbonates, and residual. Two kinds of sewage sludge were used: pure sewage sludge and sewage sludge containing 30% DM of its own incinerated ash, at rates equivalent to a field application of 150 t DM ha(-1). Pots were maintained at 80% of field capacity through daily irrigation with distilled water. Soil samples were obtained on days 1, 60, 270 and 360, and then air-dried and passed through a 2 mm sieve for analysis. Results showed that sludge application increased the less available forms of Cd, Cu and Pb. The inorganic forms became the most prevalent forms for Cu and Pb, whereas Cd was only found in the residual fraction. The concentrations of OM-Cu and INOR-Cu in the amended soil samples were closely correlated with soil pH, whereas the chemical behavior of Cd and Pb did not depend on soil physico-chemical characteristics.
开展了一项温室试验，以研究潘帕斯地区三种典型土壤中添加污水污泥后镉、铜和铅的分布情况。采用连续提取程序获得四种操作定义的地球化学形态：可交换态、与有机质结合态、与碳酸盐结合态和残留态。使用了两种污水污泥：纯污水污泥和含有其自身30%干物质焚烧灰的污水污泥，施用量相当于田间施用150吨干物质/公顷。通过每天用蒸馏水灌溉，使花盆保持在田间持水量的80%。在第1天、60天、270天和360天采集土壤样品，然后风干并通过2毫米筛子进行分析。结果表明，施用污泥增加了镉、铜和铅的难利用形态。无机形态成为铜和铅最普遍的形态，而镉仅存在于残留部分。改良土壤样品中有机态铜和无机态铜的浓度与土壤pH密切相关，而镉和铅的化学行为不依赖于土壤理化特性。
