一种简单的流动注射系统，带有珠注射，用于痕量铁的测定。

A simple flow injection system with bead injection for trace iron determination.

机构信息

Department of Chemistry, Faculty of Science and Institute for Science and Technology Research and Development, Chiang Mai University, Chiang Mai 50200, Thailand.

出版信息

Talanta. 2002 Apr 22;57(1):187-92. doi: 10.1016/s0039-9140(02)00012-7.

DOI:10.1016/s0039-9140(02)00012-7

PMID:18968618

Abstract

A simple and low cost flow injection (FI) system with bead injection (BI) was developed for determination of low concentration (mumol l(-1)) of iron in water samples. Chelex-100 chelating resin beads, trapped in a jet ring cell, were employed. The intensity of red complex of 1,10-phenanthroline with Fe(2+) was monitored using colorimetric detector with a LED green light source. Amount of total Fe (Fe(2+) and Fe(3+)) and Fe(2+) can be evaluated by with and without reduction of Fe(3+) using ascorbic acid. Lowest detectable levels of Fe(2+) were 0.90 and 0.45 mumol l(-1) for sample loading time of 3 and 5 min, respectively. Working range was up to 3.90 mumol l(-1) using 0.3% w/v 1, 10-phenanthroline. Percent recoveries of spiked water samples (0.90-2.33 mumol l(-1) of Fe(2+)) were 100-110%.

摘要

开发了一种简单且低成本的流动注射（FI）系统，结合珠注射（BI），用于测定水样中低浓度（毫摩尔每升）的铁。将螯合树脂珠（Chelex-100）捕获在射流环室中。使用带有 LED 绿光光源的比色检测器监测 1,10-菲啰啉与 Fe（2+）形成的红色络合物的强度。通过使用抗坏血酸还原 Fe（3+）和不还原 Fe（3+），可以评估总铁（Fe（2+）和 Fe（3+））和 Fe（2+）的含量。在样品加载时间为 3 和 5 分钟时，Fe（2+）的最低检测限分别为 0.90 和 0.45 毫摩尔每升。使用 0.3%w/v 1,10-菲啰啉，工作范围可达 3.90 毫摩尔每升。对加标水样（0.90-2.33 毫摩尔每升的 Fe（2+））的回收率为 100-110%。