Under the condition of sediment exposure, the kinetic parameters of the absorption process of accumulation and elimination of heavy metals Cu and Pb in Meretrix meretrixwere investigated using a semi-static two-compartment kinetic model. The kinetic parameters of bioconcentration were obtained from the model by nonlinear curve fitting, including uptake rate constant (K1), elimination rate constant (K2), bioconcentration factor (BCF), and biological half-life (B1/2).The modeling results showed that K1 ranged from 4.6333 to 72.3754, K2 ranged from 0.0512 to 0.0798, BCF ranged from 60.7646 to 1414.9634, and B1/2 ranged from 8.69 to 13.55. We found that the metal concentration data was confirmed to the two-compartment model, and that good agreement was found between the predicted and observed metal concentrations using the goodness-of-fit test under the condition of sediment exposure. The results also indicated that K1 and BCF of M. meretrixgenerally decreased with the increase of heavy metal exposure concentration in the ambient seawater, that the bioaccumulation ability order to the two heavy metals was Cu>Pb, that B1/2 of Cu was longer than that of Pb, and that maximal content in the organism (CAmax) at the theoretic equilibrium increased and was basically proportiona1to increasing metal concentration in the water. The experimental results showed that the semi-static two-compartment kinetic model could well fit the bioconcentration of heavy metals Cu and Pb in M. meretrix, but requires further experimental research and analysis under different conditions.
LI Lei
,
WANG Yun-long
,
SHEN Ang-lü
,
JIANG Mei
,
HUANG Hou-jian
,
SHEN Xin-qiang
. Kinetic study on the bioconcentration of heavy metals Cu and Pb in Meretrix meretrix under the condition of sediment exposure[J]. Journal of Tropical Oceanography, 2013
, 32(1)
: 70
-75
.
DOI: 10.11978/j.issn.1009-5470.2013.01.010
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