浙江椒江口潮间带沉积物中痕量金属的活性态分布特征及其生物有效性  

Distributions of Simultaneously Extracted Metals(SEM) and Its Implication for Bioavailability in the Jiaojiang Estuary of Zhejiang

作　　者：叶思源[1] 周永青[2] 丁喜桂[3] 

机构地区：[1]中国矿业大学资源开发工程系,北京100083 [2]青岛海洋地质研究所,山东青岛266071 [3]山东科技大学,山东青岛266510

出　　处：《吉林大学学报（地球科学版）》2006年第4期592-598,共7页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局地质大调查项目(12112010310402)

摘　　要：3个未扰动柱状样分别采自浙江椒江口潮间带高、中、低潮带,用冷盐酸法测定了沉积物中酸可挥发硫化物(AVS)及同步提取金属(SEM),分析了不同潮位沉积物剖面类型及形成机理,并根据SEM-Me/AVS比值评价痕量金属(Cu、Pb、Zn、Cd、Cr、As、Hg及Ni)的活性和生物有效性。结果表明:在高潮带和低潮带形成了薄活动层剖面(<6 cm),痕量金属的活性态浓度较低,AVS浓度较高;而中潮带形成了厚活动层(约26 cm),痕量金属的活性态浓度较高。潮间带不同潮位痕量金属活性态浓度剖面类型的形成是沉积速率、有机质供源及所处潮位共同作用的结果。在河口区应该存在表层mm尺度上的高值有机碳(C有机)分布。Three undisturbed cores were sampled from the tidal zone of Jiaojiang estuary of Zhejiang in the May of 2003. The study mainly focused on acid volatil sulphide （AVS） and simultaeously extracted metals （SEM） by using cold HC1 extruction techniques to digest each sample, and by the iodine method to measure AVS and by ICP-MS（or ICP-AES） to measure trace metals （or Fe）. The formation processes has been analysed for sediment profiles of trace metals at high tide, midst tide and low tide land. Futhermore, the chemical activtity and bioavailability of trace metals in various tidal zoneshave been evaluated based on the molar ratio of SEM-Me/AVS. The results suggest that the layer withthe ratio of SEM-Me/AVS more than 1 is thiner than 6cm at high tidal or low tidal land, which indicate that the trace metals appear to be of less reactive or unbioavailability, and is thick （around 26 cm） at the midst tide land, which suggest that the trace metals are more reactive or bioavailability. Moreover,there is an organic carbon highly riched layer in the upmost sediments （it may be several millimetre）.

关 键 词：椒江口 潮间带 酸可挥发硫化物 同步提取金属 生物有效性 

分 类 号：X142[环境科学与工程—环境科学]