适用于海岸带区域溶解态总铁的检测方法研究  

Method for Determination of Total Dissolved Iron in Coastal Samples

作　　者：林明月[1,2] 潘大为[1] 张海云[1,2] 韩海涛[3] 苏振翠 

机构地区：[1]中国科学院烟台海岸带研究所,中国科学院海岸带环境过程与生态修复重点实验室,山东省海岸带环境过程重点实验室,山东烟台264003 [2]中国科学院大学,北京100049 [3]烟台大学化学化工学院,山东烟台264005

出　　处：《环境科学与技术》2015年第5期74-77,共4页Environmental Science & Technology

基　　金：国家自然科学基金项目(41276093)

摘　　要：铁是海洋初级生产力的重要限制因素,在地球生物化学循环中起到重要作用。对于入海河流及近岸海域而言,铁的含量、形态丰富,是大洋海水中铁的重要来源,因此建立一个适用于海岸带区域溶解态总铁的分析检测方法,对于进一步认识铁循环机制和有效预防海洋环境污染等具有重要意义。文章采用阴极溶出伏安法,考察了缓冲溶液,电化学参数等对实验测定的影响。结果表明：在0.01mol/L,p H=4.0的HAc-Na Ac缓冲溶液体系中,-0.2 V恒电位搅拌富集5 s后阴极化扫描,Fe3＋在-1.24 V左右出现阴极溶出峰。在最优的条件下,0.1~100μmol/L范围内,Fe3＋的溶出峰电流与其浓度呈很好的线性关系。对实际样品（入海河流、近岸海水和沉积物）检测的回收率均在90%~110%之间,表明该方法适用于海岸带区域中溶解态总铁的检测。Iron as an important limiting factor of marine primary productivity plays a significant role in biogeochemical cycles. The concentration and speciation of iron in coastal zone water are much plentiful and are the main source of oceanic water. Therefore, to further understand the iron cycling mechanism and prevent the marine pollution effectively, it is very necessary and important to establish a method of iron determination for coastal water, Experimental parameters such as the concentration and pH of the supporting electrolyte, the accumulation potential and time were optimized. Results showed that a remarkable cathodic peak appeared at -1.24 V when accumulating for 5 s at -0.2 V in 0.01 mol/L HAc-NaAc （pH=4.0） solution with stirring. A linear response was obtained in the concentration range 0.1-100 μmol/L under the optimized conditions. The recovery of the real sample determination was between 90%~110%, indicating this method can be used to determine the total dissolved iron in coastal zone.

关 键 词：溶解态总铁 海岸带区域 差分脉冲阴极溶出伏安法 

分 类 号：X132[环境科学与工程—环境科学]