浒苔对镉、铅和铝的生物富集动力学研究

Kinetics of Cadmium, Lead and Aluminum Bioaccumulation by Enteromorpha prolifera

摘要:

本文研究了浒苔对镉、铅和铝的富集作用，在各养殖池中添加Cd2+（5、20、80 μg/L），Pb2+（5、20、80 μg/L）和Al3+（5、20、80 μg/L），利用电感耦合等离子体质谱法（ICP-QMS）测定浒苔中Cd、Pb和Al的含量，并对其变化进行非线性拟合，获取动力学参数。结果表明：浒苔对Cd、Pb和Al的富集与暴露浓度呈正相关关系；Cd和Pb的富集符合双箱动力学模型，而Al符合Logistic动力学模型。其中浒苔中Cd的双箱模型回归富集速率常数Ka为418.68、234.30和105.57，富集系数为1785.12、1429.67和625.69；Pb的富集速率常数Ka为1257.30、768.81和863.83，富集系数11028.95、50249.08和9119.79；浒苔中Al的Logistic模型回归富集速率常数0.39、0.42和0.46。浒苔对镉、铅和铝三种重金属具有较强的富集作用，双箱动力学模型可显著预测Cd和Pb的富集，Logistic模型可显著预测Al的富集。

Abstract:

In this study, we investigated the accumulation of cadmium (Cd), lead (Pb), and aluminum (Al) by the alga Enteromorpha prolifera. The metal ions, Cd2+ (5, 20, 80 μg/L), Pb2+ (5, 20, 80 μg/L), and Al3+ (5, 20, 80 μg/L), were added to different culture ponds. Inductively coupled plasma mass spectrometry was used to determine the content of Cd, Pb, and Al in Enteromorpha prolifera. The changes in mineral content were fitted nonlinearly and their kinetic parameters were obtained. The results showed that the accumulation of Cd, Pb, and Al in Enteromorpha prolifera positively correlated with exposure concentration. Accumulation of Cd and Pb satisfied the two-compartment kinetic model, while Al fitted the logistic kinetic model. The two-compartment regression accumulation rate constants (Ka) for Cd were 418.68, 234.30, and 105.57, while the bioaccumulation factors (BCFs) were 1785.12, 1429.67, and 625.69. For Pb, Ka values were 1257.30, 768.81, and 863.83, while the BCFs were 11028.95, 50249.08, and 9119.79. Logistic model regression accumulation rate constants for Al were 0.39, 0.42, and 0.46. Enteromorpha prolifera had relatively strong accumulation effect to Cd, Pb, and Al, which can be significantly predicted for Cd and Pb by the two-compartment model and for Al, by the logistic model.