摘要以魁蚶为研究对象，应用半静态双箱动力学模型，模拟魁蚶对3种重金属As、Cd、Pb的生物富集试验，对魁蚶体内重金属含量进行检测，并进行非线性拟合，试验结果表明，魁蚶在GB 3097－1997二类水质标准下富集重金属的动力学常数分别为无机砷38．97，铅1039．88，镉1566．80；富集能力依次为镉＞铅＞无机砷；生物学半衰期分别为无机砷20．5 d ，铅15．4 d ，镉21．3 d。结合N Y 5135－2005《无公害食品蚶》的安全限量，通过生物富集系数换算得到魁蚶养殖水体中3种重金属安全限量分别为无机砷0．02900 mg／L、铅0．00096 mg／L、镉0．00064 mg／L ，可为制定的养殖魁蚶水质标准中安全限量提供科学依据。
Abstract：The bio‐concentration and elimination of As ,Cd and Pb in the tissue of clam Scapharcabrough‐tonii were investigated in double‐boxes kinetic model in order to provide reference for aquaculture practices safety levels .A semi‐static system was maintained throughout a 35‐day exposure period in different con‐centrations of heavy metals .The aquaculture water concentrations of heavy metals were set according to the national second‐class seawater standard (GB 3097—1997) ,removing the background values in natural seawater .Then ,the test organism was transferred to clean seawater for a elimination period of 35 days . The results showed that the bio‐concentration factor (BCF) was 38 .97 for inorganic arsenic ,1029 .88 for Pb and 568 .80 for Cd .The accumulation ability order was expressed as Cd> Pb>inorganic arsenic .And the biological half‐life (B1/2 ) was 20 .5 d for inorganic arsenic ,15 .4 d for Pb and 21 .3 d for cd .In this study ,under the national second‐class seawater standard (GB 3097—1997) ,the maximal content of heavy metals in the tissue of the clam was inorganic arsenic 1 .9671 mg/kg ,Pb 2 .5946 mg/kg and Cd 7 .2222 mg/kg .Combined with the safe limit of NY 5135—2005 ,three kinds of heavy metal safety limited converted from BCF :0 .02900 mg/L in inorganic arsenic ,0 .00096 mg/L in Pb ,0 .00064 mg/L in Cd .T he findings can provide scientific basis for the safety limits of the culture water quality .
收稿日期: 2016-05-25
引用本文:
李晓,王颖,吴志宏,刘天红,孙元芹. 魁蚶对3种重金属生物富集动力学研究[J]. , 2016, 35(5): 578-582.
LI Xiao,WANG Ying,WU Zhihong,LIU Tianhong,SUN Yuanqin. Safety Levels of Three Heavy Metals in Clam Scapharca broughtonii Culturing Water. , 2016, 35(5): 578-582.
