Influence of extractable soil manganese on oxidation capacity of different soils in Korea |
| |
| Authors: | Chul-Min Chon Jae Gon Kim Gyoo Ho Lee Tack Hyun Kim |
| |
| Institution: | (1) Korea Institute of Geoscience and Mineral Resources, 30 Gajeong-dong Yuseong-gu, Daejeon, 305-350, South Korea;(2) Korea Gas Corporation, 215 Jeongja-dong Bundang-gu, Seongnam, Gyeonggi-do, 463-754, South Korea;(3) Mine Reclamation Corporation, 80-6 Susong-dong, Jongno-gu, Seoul, 110-140, South Korea |
| |
| Abstract: | We examined the relationship between soil oxidation capacity and extractable soil manganese, iron oxides, and other soil properties.
The Korean soils examined in this study exhibited low to medium Cr oxidation capacities, oxidizing 0.00–0.47 mmol/kg, except
for TG-4 soils, which had the highest capacity for oxidizing added Cr(III) >1.01 mmol/kg of oxidized Cr(VI)]. TG and US soils,
with high Mn contents, had relatively high oxidation capacities. The Mn amounts extracted by dithionite-citrate-bicarbonate
(DCB) (Mnd), NH2OH·HCl (Mnh), and hydroquinone (Mnr) were generally very similar, except for the YS1 soils, and were well correlated. Only small proportions of either total
Mn or DCB-extractable Mn were extracted by NH2OH·HCl and hydroquinone in the YS1 soils, suggesting inclusion of NH2OH·HCl and hydroquinone-resistant Mn oxides, because these extractants are weaker reductants than DCB. No Cr oxidation test
results were closely related to total Mn concentrations, but Mnd, Mnh, and Mnr showed a relatively high correlation with the Cr tests (r = 0.655–0.851; P < 0.01). The concentrations of Mnd and Mnh were better correlated with the Cr oxidation tests than was the Mnr concentration, suggesting that the oxidation capacity of our soil samples can be better explained by Mnd and Mnh than by Mnr. The first component in principal components analysis indicated that extractable soil Mn was a main factor controlling net
Cr oxidation in the soils. Total soil Mn, Fe oxides, and the clay fraction are crucial for predicting the mobility of pollutants
and heavy metals in soils. The second principal component indicated that the presence of Fe oxides in soils had a significant
relationship with the clay fraction and total Mn oxide, and was also related to heavy-metal concentrations (Zn, Cd, and Cu,
but not Pb). |
| |
| Keywords: | Standard Cr net oxidation test Manganese oxides Iron oxides Heavy metals Oxidation capacity |
| 本文献已被 SpringerLink 等数据库收录！ |
|
