Online Flow‐Based Spectrophotometric Determination of Ferrous Iron Mass Fraction and Total Iron Mass Fraction in Twenty‐Seven Rock Reference Materials Using a Schlenk line Technique,Geostandards and Geoanalytical Research

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Online Flow‐Based Spectrophotometric Determination of Ferrous Iron Mass Fraction and Total Iron Mass Fraction in Twenty‐Seven Rock Reference Materials Using a Schlenk line Technique
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-07-08 , DOI: 10.1111/ggr.12353
Ding‐Shuai Xue _{1,

2,

3} , Ben‐Xun Su ₁ , Yan‐Hong Liu ₁ , Dan‐Ping Zhang ₁ , Qian Guo ₁ , Ju‐Jie Guo ₁ , Jie‐Fang Sun ₄ , Patrick Asamoah Sakyi ₅

Affiliation

We developed an online continuous‐flow spectrophotometric method for determination of ferrous iron and total iron mass fractions in various types of geological certified reference materials (CRMs) using a Schlenk line technique to exclude oxygen during the digestion process. The continuous‐flow technique enabled automatic, reliable and real‐time analysis, and decreased sample and reagent consumption. The Schlenk line expels air to prevent oxidation during sample digestion. Compared with traditional spectrophotometric procedures, this analytical procedure is easier, more automated and more accurate. The composition of the acid matrix and time used to dissolve the samples were carefully examined. The procedure was tested on 186 replicates of twenty‐seven rock CRMs, and the results showed good agreement with the compiled values from the literature. Based on the statistical data, the proposed procedure was found to be accurate within 0.12% m/m for ferrous iron mass fraction and 0.084% m/m for total iron mass fraction compared with the certified/recommended values. The proposed procedure is accurate, reproducible and has a high throughput (ten samples per hour).

中文翻译：

基于Schlenk线技术的在线流动分光光度法测定27种岩石参考材料中的亚铁质量分数和总铁质量分数

我们开发了一种在线连续流式分光光度法，使用Schlenk线技术在消解过程中排除氧气，用于测定各种类型的地质认证参考材料（CRM）中的亚铁和总铁质量分数。连续流技术可实现自动，可靠和实时的分析，并减少了样品和试剂的消耗。Schlenk生产线排出空气以防止样品消化过程中的氧化。与传统的分光光度法相比，该分析过程更容易，更自动化和更准确。仔细检查了酸基质的组成和溶解样品所用的时间。该程序在27个岩石CRM的186个副本中进行了测试，结果表明与文献中的汇编值具有很好的一致性。米/米为亚铁质量分数和0.084％米/米与标准/推荐的值进行比较，对总铁的质量分数。所提出的程序准确，可重复且具有高通量（每小时十个样品）。

更新日期：2020-07-08

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