Effect of humic substances quality on chemical speciation and stability of heavy metals in smelter area soils

Heavy metals;Humic substances;Chemical speciation;Stability constant;Smelter;630

농업생명과학대학 농생명공학부 ;

University:서울대학교 대학원

关键词: Heavy metals;    Humic substances;    Chemical speciation;    Stability constant;    Smelter;    630;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/125808/1/000000012713.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

Podlešáková et al., 1992) was used to specify the treatment effect of humic substances. The addition of humic substances lessened the decrease of soil pH. Accordingly, in cases of Cu and Pb, the addition of humic substances increased less mobile chemical forms (carbonate bound, Fe-Mn oxide bound, and organic bound fractions) but decreased available forms (water soluble and exchangeable fraction) than control group. In particular, HA/FA=2 treatment was most effective among treatment groups to decrease the amount of mobile fractions and increase the stable forms. However, As did not show any significant differences between control and treatments and its chemical speciation shift to stable forms might have been attributed to the effect of soil acidification. Most metals were distributed to the fulvic fractions, which meant fulvic acids had greater chelating ability than humic acids did. However, in terms of stability constants, the log K values for metal-HA complexes were inclined to increase while the log K values for metal-FA complexes decreased. The results of the study suggested that humic substances can contribute to the immobilization and stabilization of metals in heavily polluted soils.