Simultaneous determination of soluble manganese(III), manganese(II) and total manganese in natural (pore)waters
Simultaneous determination of soluble manganese(III), manganese(II) and total manganese in natural (pore)waters
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DOI：
10.1016/j.talanta.2011.01.025
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发表时间：
2011-04-15
期刊：
影响因子：
6.1
通讯作者：
Luther, George W., III
中科院分区：
文献类型：
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作者：
Madison, Andrew S.;Tebo, Bradley M.;Luther, George W., III
建立了一种同时测定可溶性锰（III）的分光光度法。利用水溶性中位取代卟啉[α， β, γ， δ -四（4-羧基苯基）卟啉（T(4-CP)P）]研究沉积物孔隙水中的Mn（II）和总Mn[可溶性Mn（III）和Mn（II）的总和]。一个简单的动力学速率模型用于量化金属取代反应中可溶性Mn(II), Mn（III）和总Mn浓度。在优化条件下，该方法可在100nM-10 μ m浓度范围内准确测定可溶性Mn（II）和Mn(III)，总可溶性Mn的检出限为50 nM。用该方法测定了标准溶液中可溶性Mn（II）和Mn（III）的浓度，测定范围在已知值的0.4-2%之间，与电感耦合等离子体质谱和伏安分析结果吻合较好。该方法成功地应用于测定下圣劳伦斯河口沉积物孔隙水中的可溶性锰（II）、锰（III）和总锰。锰（III）占表层沉积物中总可溶性锰库的85%。(C) 2011 Elsevier B.V.版权所有
A new spectrophotometric protocol was developed for the simultaneous determination of soluble Mn(III). Mn(II) and total Mn [sum of soluble Mn(III) and Mn(II)] in sediment porewaters using a water soluble meso-substituted porphyrin [alpha,beta,gamma,delta-tetrakis(4-carboxyphenyl)porphine (T(4-CP)P)]. A simple kinetic rate model is used to quantify soluble Mn(II), Mn(III) and total Mn concentrations during a metal substitution reaction. Under optimized conditions, the method accurately determines soluble Mn(II)and Mn(III) within a concentration range of 100nM-10 mu M. The detection limit of total soluble Mn is 50 nM. Using this method, soluble Mn(II) and Mn(III) concentrations were determined in standard solutions within 0.4-2% of the known values and agreed closely with results of inductively coupled plasma mass spectrometric and voltammetric analyses. The procedure was successfully applied to determine soluble Mn(II), Mn(III) and total Mn in sediment porewaters of the Lower St. Lawrence Estuary. Mn(III) represented up to 85% of the total soluble Mn pool in surface sediments. (C) 2011 Elsevier B.V. All rights reserved.