@article{fdi:010036643,
  title = {{S}oil heavy metal contamination and acid deposition : experimental approach on two forest soils in {H}unan, {S}outhern {C}hina},
  author = {{L}iao, {B}.{H}. and {G}uo, {Z}.{H}. and {P}robst, {A}nne and {P}robst, {J}.{L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n 1985, a tailing dam collapsed in {H}unan province (southern {C}hina) leading to soil contamination by heavy metals from the tailings waste. {M}oreover, acid deposition becomes more and more serious in this area. {I}n this context, two forest soils (a red soil and a yellow red soil, typically and commonly found in southern {C}hina) were collected from {H}unan. {T}he objectives are (i) to determine releases and changes in speciation fractions of heavy metals (especially {C}d, {C}u, and {Z}n) when the soils are contaminated with heavy metals and affected by simulated acid deposition, and (ii) to study effects of soil heavy metals and acid deposition on releases of soil {C}a2+, {M}g2+, and {A}l3+. {T}he soil samples were soaked in the solutions of {C}d{C}l2, {C}u{C}l2, and {Z}n{C}l2 for 15 days to make contaminated soils containing 200 mg kg(-1) of {C}d, {C}u, and {Z}n. {T}hen the contaminated soils and the original soils were extracted with five simulated acid deposition solutions (p{H} ranged from 5.6 to 3.0 and total dissolved salts increased). {T}he experimental results indicate that acid deposition leads to great releases of soil heavy metals due to complicated soil chemical processes, mostly cation exchange and partly dissolution of minerals at p{H} lower than 4.2. {T}hese released heavy metals come mainly from soil exchangeable pools and other labile fractions. {R}eleases of heavy metals are closely controlled by p{H} values or, in some cases, total cation contents in acid deposition; meanwhile, concentrations of heavy metals are negatively related to the relevant p{H} values in soil equilibrium solutions when p{H} values are in a range of 4.2-5.1. {F}rom the point of view of heavy metal releases, {Z}n is the most sensitive to acid deposition, followed by {C}d and {C}u. {C}ompared with the original soils, the contaminated soils could probably release more base cations {C}a2+ and {M}g2+ and less {A}l3+. {G}reater amounts of {C}d, {C}u, {Z}n, and {A}l released from {S}oil {B} show that this soil is more sensitive to acid deposition, and we could expect serious environmental contamination in {S}oil {B} area if mining activities and acid deposition are not under control in the future. (c) 2004 {E}lsevier {B}.{V}. {A}ll rights reserved.},
  keywords = {heavy metal ; acid deposition ; complex contamination ; forest soil ; southern {C}hina},
  booktitle = {},
  journal = {{G}eoderma},
  volume = {127},
  numero = {1-2},
  pages = {91--103},
  ISSN = {0016-7061},
  year = {2005},
  DOI = {10.1016/j.geoderma.2004.11.019},
  URL = {https://www.documentation.ird.fr/hor/fdi:010036643},
}