Heavy Metal Release from Soils in Batch pHstat Experiments

Abstract

BC of soils (van Breemen et al., 1983). Soil acidification may be defined as the loss of ANC and does not neces-In Slovakia H ؉ input into soils is increasing because alkaline dust sarily result in the decrease of the soil equilibrium pH emissions have been reduced since 1990. Our objectives were to exam-(van Breemen et al., 1983). Sü sser (1987) described ine (i) the metal release in H ؉ buffer reactions of Slovak soils and (ii) the impact of the proton buffering on heavy metal partitioning. buffer reactions in soils during pH stat experiments as the We used 10 soils (pH 7.4-3.6) in a batch pH stat experiment. Released sum of two independent reactions both following firstions were adsorbed to an ion-exchange resin, while pH was kept order kinetics.

The Use of Leaching Tests to Study the Potential Mobilization of Heavy Metals from Soils and Sediments: A Comparison

“…ANC and leaching of metals as a function of time was described mathematically for both types of titration experiments by the use of MATLAB and EXCEL software. ANC curves obtained in the pH stat tests with continuous setpoint titration were modeled according to Schwarz et al (1999). The proton buffering capacity of soils during pH stat experiments can be formulated as the sum of two independent first-order reactions, i.e.…”

Distribution of Heavy Metals in Calcareous and Non-Calcareous Soils in Spain

“…The main fraction for Pb was the residual phase, except for soil 1 where the high acidity of the soil may favour the sorption of Pb on secondary oxides (Schwarz et al, 1999). A large proportion of Pb was in the oxidizable phase for soils 2 and 3, probably due to the presence of Pb organic complex for soil 3 and Pb sulphides in the parent materials in the soil 3.…”

Heavy Metals in Brown Bears from the Central European Carpathians

“…However, these levels are lower than those observed in bears and are in accordance with the assumption that the heavy metal load of omnivores is higher than that of ruminants living in the same area (Chudík and MaÀkovská 1987). Although emissions of toxic elements have been decreasing since 1990 (Keegan et al 2006), they are more acid and the mean soil acidification (Schwartz et al 1999) allows for easier infiltration of certain metals into the soil extract and thus into plants. Thus metals become a part of the food chain of bears and other animals.…”