缢蛏(Sinonovacula constricta)对海水中镉富集规律的研究  

Study on cadmium bioaccumulation in Sinonovacula constricta

作　　者：陆慧贤[1] 徐永健[1] 

机构地区：[1]宁波大学海洋学院/应用海洋生物技术教育部重点实验室,浙江宁波315211

出　　处：《生态科学》2013年第4期434-438,共5页Ecological Science

基　　金：浙江省自然科学基金项目(Y3110476);国家科技支撑计划(2009BADB7B02)

摘　　要：论文利用微波消解-石墨炉原子吸收法,研究在不同Cd2+浓度(0.005 mg·L-1、0.025 mg·L-1、0.05 mg·L-1、0.1 mg·L-1)暴露下缢蛏对水体Cd2+的富集规律。结果表明,缢蛏对重金属Cd2+有一定的富集能力,其软体组织对Cd2+的富集量、富集速率随暴露剂量增加而升高,并在168 h的暴露时间内,体内Cd含量及其富集倍数(BCM)与暴露时间呈显著的正相关关系(P<0.01);缢蛏不同组织对Cd的富集能力(富集量、富集速率、富集倍数)存在显著差异,其消化腺、鳃和肌肉组织对Cd富集能力的大小表现为:消化腺>鳃>肌肉。与其他贝类对Cd的富集情况相比,缢蛏不是Cd的强净积累者。Cd bioaccumulation in Sinonovacula constricta under different Cd concentrations（0.005 mg·L-1,0.025 mg·L-1,0.05 mg·L-1and 0.1 mg·L-1） was investigated using microwave digestion-graphite furnace atomic absorption spectrometry. The result showed that S.constricta had the ability to accumulate Cd2＋in seawater. The amount and rate of Cd bioaccumulation in soft tissue of S. constricta increased with increasing Cd2＋concentration in seawater; meanwhile,during the period of 168 h exposure time,Cd bioaccumulation and biological concentration multiples（BCM） in the mollusks were positively related to the exposure time（P0.01）. Furthermore,there were discrepancies of accumulation abilities,such as bioaccumulation amount,bioaccumulation rate and BCM. In different tissues of S.constricta,Cd accumulation in gills was more significant than in muscle,but less than in digestive glands. S. constricta is not a species with strong Cd-bioaccumulation ability as compared with other mollusks.

关 键 词：缢蛏 Cd2+ 生物富集 

分 类 号：S968.3[农业科学—水产养殖]