A new method for nanomolar determination of silicic acid in seawater

被引：13

作者：

Rimmelin-Maury, Peggy ^{[1
]}

Moutin, Thierry ^{[1
]}

Queguiner, Bernard ^{[1
]}

机构：

[1] Univ Mediterranee, Lab Ocenaog & Biogeochim, Ctr Oceanog Marseille OSU, Unite Mixte Rech 6535,CNRS, F-13288 Marseille 09, France

来源：

ANALYTICA CHIMICA ACTA | 2007年 / 587卷 / 02期

基金：

美国国家航空航天局; 加拿大自然科学与工程研究理事会;

关键词：

Magnesium Induced Co-Precipitation; spectrophotochemical analysis; silicic acid; seawater; Mediterranean sea;

D O I：

10.1016/j.aca.2007.01.055

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A novel method is proposed to determine concentrations of silicic acid in seawater in the nanomolar range of 3-500 nM. It preconcentrates silicic acid through a "Magnesium Induced Co-precipitation" (MAGIC) step before a classical spectrophotometric measurement. The detection limit (3 +/- 2 nM) is improved by a factor 10 in comparison to the conventional colorimetric methods. The best precision obtained to date is +/- 2 nM for a natural sample of 69 nM Si. No interference of phosphate was observed by contrast to previous methods. This simple method offers a simple, sensitive and accurate tool for silicic acid determination in depleted seawater, where its availability remains unknown. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：281 / 286

页数：6

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