title: Copper release kinetics from a long-term contaminated acid soil using a stirred flow chamber: effect of ionic strength and pH.
abstract: The effect of pH and ionic strength on copper release in a long-term Cu-polluted soil was studied using a stirred flow chamber. The presence of Ca(2+) and Na(+) was also evaluated. More copper was released as the ionic strength increased, and it was significantly higher in the presence of Ca(2+) than in the presence of Na(+). The maximum amount of Cu that could be released under experimental conditions increased logarithmically as the ionic strength increased, and the release rate parameters were not significantly correlated with ionic strength values. The maximum amount of Cu that could be released was similar for solutions with pH values between 5.5 and 8.5. For solutions with a pH value below 4.5, the amount of Cu released increased exponentially as the pH decreased. The release rate parameters and Cu release pattern were affected by pH, especially for more acidic solutions (pH values of 2.5 and 3.5).
authors: Área de Edafoloxía e Química Agrícola, Departamento de Bioloxía Vexetal e Ciencia do Solo, Universidade de Vigo, Facultade de Ciencias, 32004 Ourense, Spain.
authors: David
authors: D
authors: Fernández-Calviño
authors: Alipio
authors: A
authors: Bermúdez-Couso
authors: Beatriz
authors: B
authors: Garrido-Rodríguez
authors: Susana
authors: S
authors: Peña Rodríguez
authors: Manuel
authors: M
authors: Arias-Estévez
mesh_terms: D000143:Acids / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009994:Osmolar Concentration; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D000143:Acids; D012987:Soil; D012989:Soil Pollutants; D003300:Copper