烟台近海水体不同形态铁的检测分析  

Speciation analysis of iron in Yantai coastal waters

作　　者：林明月[1,2] 潘大为[1] 胡雪萍[1,2] 朱云[1,2] 韩海涛[1] 李菲[3] 

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,烟台264003 [2]中国科学院大学,北京100049 [3]山东师范大学化学化工与材料科学学院,济南250014

出　　处：《环境化学》2016年第2期297-304,共8页Environmental Chemistry

基　　金：国家自然科学基金(41276093)资助~~

摘　　要：本文采用2,3-二羟基萘作为三价铁的络合剂,KBr O_3作为催化剂,在采样过程中加入2,2'-联吡啶掩蔽活性二价铁,用催化吸附阴极溶出法对烟台近岸海水中总活性铁、活性三价铁、活性二价铁、溶解态总铁以及有机络合态铁等5种形态铁的含量进行了分析测定,建立了一套适用于分析近岸海水中5种不同形态铁的方法.该方法测定的最低检出限为0.84 nmol·L^(-1),灵敏度根据所加入铁浓度不同分别为12.5、3.95、1.25 n A·L·nmol-1.此外,应用文中方法对标准海水样品CASS-5和NASS-6中的铁含量进行测试,测试结果与标准海水中铁的浓度基本符合.Speciation analysis of iron in seawater is very important because it is related to its uptake by phytoplankton. 2,3-dihydroxynaphthalene as the complexing ligand and KBrO3 as the catalyst were utilized herein to measure iron speciation in Yantai coastal waters. Besides, 2,2-dipyridyl was added in the sampling process to mask Fe（Ⅱ） in order to measure reactive Fe（Ⅲ）. Using the improved pretreatment, the concentrations of total reactive iron, reactive Fe（Ⅲ）, reactive Fe（Ⅱ）, total dissolved iron, and iron complexed with natural organic matters of Yantai coastal seawater were obtained by catalytic adsorptive cathodic stripping voltammetry. The detection limit of this method was 0.84 nmol·L^-1, and sensitivity was 12.5, 3.95, 1.25 nA·L·nmol^-1 respectively according to the amount of iron addition. Additionally, this method was validated by iron determination in standard seawater CASS-5 and NASS-6 and the results were in agreement with the certified values.

关 键 词：海水 铁形态 电化学分析 

分 类 号：X832[环境科学与工程—环境工程]