Abstract
Mo bioaccumulation in the earthworm Eisenia andrei was determined after 28d exposure in ten different European field soils (pH 4.4–7.8) and an artificial soil, freshly spiked with Na2MoO4 at concentrations between 3.2 and 3200mg Mokg−1 dry soil. Three field soils were also tested after ageing for 11months. Earthworm Mo concentrations generally levelled off at high exposure levels but in most soils showed a (nearly) linear increase with increasing soil concentrations in the lower, non-toxic range (below EC10 or NOEC for reproduction effects). Bioaccumulation (BAF) and Bioconcentration factors (BCF) were calculated as the ratio of earthworm concentration to soil and estimated porewater concentrations, respectively. BAFs (0.35–3.44) and BCFs (1.31–276) did not seem much affected by soil concentration, suggesting that earthworms are not capable of regulating their internal Mo concentrations. BAF was best predicted by ammonium oxalate-extractable iron (Feox) and phosphor (Pox) contents of the soils.
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