Solubility Fractionation of Zn, Cu and Cd in Soils Applied with Sewage Sludges and Their Potential Availability to Plant.

概要

論文の詳細を見る
Three soil samples amended with two types of sewage sludge were incubated in the laboratory, and analyzed using a sequential extraction procedure to estimate the distribution of Zn, Cu and Cd in 9 soil fractions, that is: Water(water soluble), EX. (exchangeable), L.O.M.(loosely bound to organic matter), CO3.(carbonate), Mn.OX. (manganese oxide), T.O.M.(tightly bound to organic matter), Amor.Fe(amorphous iron oxide), Cry.Fe(crystalline iron oxide), and Res.(residual). These metals were also extracted with DTPA as an index to evaluate the potential availability of these metals to plant grown in soils amended with sewage sludge. After 60 days of incubation, a portion of respective metals changed their distribution, depending on the kind of metals (Zn, Cu and Cd) and on the type of sludge. In soil samples amended with sludge containing lime and iron chloride as dewatering agents, metals were shifted into more insoluble fractions, and their DTPA extractable frac tions decreased. On the contrary, metals tended to be transferred into readily or relatively readily soluble fractions in the soil samples amended with sludge, that had lower pH with polymer dewatering agent, and their DTPA extractable fractions increased.
社団法人環境科学会の論文