John J, Gjessing E T, Grande M, Salbu B
Sci Total Environ. 1987 Apr;62:253-65. doi: 10.1016/0048-9697(87)90507-9.
Uptake and release of cadmium by Atlantic salmon at the concentrations near the background values for fresh water have been studied using cadmium labelled with Cd-109. Cumulation constant and biological half-time of release were established for different concentrations of humus and values of pH. The uptake is strongly dependent on the concentration of humus, showing a pronounced maximum at a DOC concentration of 2.7 mg/l. Release of cadmium is relatively slow, the biological half-time exceeds one year in the water without humic substances. Calculated bioconcentration factors range from 130 to several thousands, which may explain the wide differences of bioconcentration factor reported for natural systems. A general equation enabling calculation of bioconcentration factors for various conditions has been derived. An attempt is done to discuss the results from the point of view of physico-chemical forms of cadmium in respective waters. The amount of cadmium adsorbed on the surface of the fish was proved to be insignificant when compared with total concentration of cadmium bioaccumulated in the fish.
利用镉 - 109标记的镉，研究了大西洋鲑鱼在接近淡水背景值浓度下对镉的摄取和释放情况。针对不同浓度的腐殖质和pH值，确定了累积常数和镉释放的生物半衰期。镉的摄取强烈依赖于腐殖质浓度，在溶解性有机碳（DOC）浓度为2.7毫克/升时出现明显的最大值。镉的释放相对较慢，在没有腐殖质的水中生物半衰期超过一年。计算得出的生物浓缩系数范围为130至数千，这可能解释了天然系统中报道的生物浓缩系数的巨大差异。已推导得出一个能计算各种条件下生物浓缩系数的通用方程。尝试从镉在各自水体中的物理化学形态角度讨论这些结果。与鱼体内生物累积的镉总浓度相比，证明吸附在鱼表面的镉量微不足道。
