不同脱除剂对暂养紫贻贝体内重金属Cd2+的脱除效果

重金属镉(Cd2+)污染是影响双壳贝类食用安全的重要因素之一。以紫贻贝为研究对象,探索不同脱除剂对暂养紫贻贝体内重金属Cd2+的脱除效果。将染Cd2+的紫贻贝暂养在含不同脱除剂天然海水中,定期更换暂养水体并取样,采用原子吸收法测定贻贝中Cd2+含量。实验采用硒代蛋氨酸、硒化卡拉胶、亚硒酸钠、EDTA-FeNa、EDTA-ZnNa₂、EDTA、氯化亚铁、氯化铁、氯化锌、β-葡聚糖、肽聚糖及葡萄糖酸钙作为脱除剂,评价暂养过程中其对紫贻贝体内重金属Cd2+的脱除效果。结果显示,60和120 mg/L硒化卡拉胶、160 mg/LEDTA-CaNa₂和500 mg/L β-葡聚糖净化处理后,对紫贻贝体内Cd2+具有良好的脱除效果(p<0.05),其脱除率分别为43.6%、37.2%、41.6%和44.6%。

Depuration of cadmium from cultured mussels (Mytilus edulis) by different removal reagents

Heavy metal cadmium(Cd2+) pollution is an important factor affecting the edible safety of the mussels.In this study, the depuration of cadmium by different removal reagents was explored with the cultured mussels (Mytilus edulis) as the experimental animal. Mussels exposured by Cd2+ were temporarily cultured in the natural seawater with different removal reagents.Then,the seawater containing the removal reagents was changed periodically,after the sampling,the concentrations of Cd2+ in mussels was determined by using atomic absorption spectrometry.During the depuration,the kappa-selenocarrageenan, sodium selenite,EDTA-FeNa,EDTA-ZnNa₂,EDTA,ferrous chloride,ferric chloride,zinc chloride,β-glucan,peptidoglycan and calcium gluconate were designed as removal reagents. The results indicated that 60 and 120 mg/L kappa-selenocarrageenan,160 mg/L EDTA-CaNa₂,and 500 mg/L β-glucan showed significant Cd2+ removal effects(p<0.05),the removal rates of which were as following:43.6%,37.2%,41.6%,and 44.6%,respectively.