The chemical properties of the soils are shown in Table 1. The pH of both experimental and control soils was acidic with similar low organic matter contents. Organic matter content has a strong influence on the retention of heavy metals because has effects on
cation exchange and buffer capacities. Hence, organic soils lead to a lower bioavailability and mobility of metals than those present in mineral soils (Olaniran et al., 2013), whereas at low pH the metals tend to be found as free ionic species or even as soluble organo-metals, and they are more bioavailable (Sandrin and Hoffman,2007). So, in accordance with soil properties (acidic pH, low%OM), metals are more mobile and more bioavailable.
The chemical properties of the soils are shown in Table 1. The pH of both experimental and control soils was acidic with similar low organic matter contents. Organic matter content has a strong influence on the retention of heavy metals because has effects oncation exchange and buffer capacities. Hence, organic soils lead to a lower bioavailability and mobility of metals than those present in mineral soils (Olaniran et al., 2013), whereas at low pH the metals tend to be found as free ionic species or even as soluble organo-metals, and they are more bioavailable (Sandrin and Hoffman,2007). So, in accordance with soil properties (acidic pH, low%OM), metals are more mobile and more bioavailable.
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