Skip to Content
Merck
  • The bioaccumulation of Molybdenum in the earthworm Eisenia andrei: influence of soil properties and ageing.

The bioaccumulation of Molybdenum in the earthworm Eisenia andrei: influence of soil properties and ageing.

Chemosphere (2010-12-15)
Cornelis A M Van Gestel, Maria Diez Ortiz, Eef Borgman, Rudo A Verweij
ABSTRACT

Mo bioaccumulation in the earthworm Eisenia andrei was determined after 28 d 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 3200 mg Mo kg⁻¹ dry soil. Three field soils were also tested after ageing for 11 months. 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 (Fe(ox)) and phosphor (P(ox)) contents of the soils.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Sodium molybdate, anhydrous, powder, −100 mesh particle size, 99.9% trace metals basis
Sigma-Aldrich
Sodium molybdate dihydrate, ACS reagent, ≥99%
Sigma-Aldrich
Sodium molybdate dihydrate, ≥99.5%, suitable for plant cell culture
Sigma-Aldrich
Sodium molybdate dihydrate, ≥99.5%
Sigma-Aldrich
Sodium molybdate dihydrate, 99.99% trace metals basis
Sigma-Aldrich
Sodium molybdate, ≥98%