In-situ immobilization of cadmium and lead by different amendments in two contaminated soils
Journal
Water, Air, and Soil Pollution
Journal Volume
140
Journal Volume
140
Journal Issue
1-4
Journal Issue
1-4
Pages
73-84
Start Page
73
End Page
84
ISSN
00496979
Date Issued
2002-10
Author(s)
Cheng, Shuang-Fu
Abstract
Different soil amendments, including 1% zeolite, 1% bentonite, 5% Penghu soil (PHS), 5% Penghu soil + 1% manganese oxide (PHS + MO), 1% MO, and 1.5% silicate slag (SS), were used to immobilize Cd and Pb in two contaminated soils evaluated by single and sequential extractions and by uptake of Chinese cabbage (Brassica Chinensis L.). Results indicated that the PHS and MO significantly (p < 0.05) reduced the 0. 1 M HCl extractable Cd and Pb in the two contaminated soils. All amendment treatments did not change the organic and residual amounts of Cd and Pb in soils A and B, but the PHS and PHS + MO treatments significantly reduced the exchangeable amounts of Cd and Pb in the two soils as measured by sequential extraction. The combination of PHS and MO amendments was associated with a high pH value and negative soil surface charge showed the best immobilizing efficiency of Cd and Pb in this study. All soil amendments investigated did not increase the dry matter weight of the plant, and most of them decreased the uptake of Cd and Pb, especially for the PHS and MO. The PHS and MO treatments reduced the extractability of Cd and Ph in two soils and their uptake by the plant, but only the Pb content in Chinese cabbage from the amended soils was less than the background levels of heavy metals in leaf vegetables of Taiwan.
Subjects
Amendment
Contamination
Heavy metal
In situ immobilization
Sequential extraction
SDGs
Type
journal article