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Mössbauer Study of the Attenuation of Iron in an Irrigated Greensand Lysimeter

Published online by Cambridge University Press:  01 July 2024

C. A. M. Ross  and
G. Longworth
C. A. M. Ross
Affiliation:
Institute of Geological Sciences, Atomic Energy Research Establishment Harwell, Oxfordshire, OX 11 0RA, United Kingdom
G. Longworth
Affiliation:
Nuclear Physics Division, Atomic Energy Research Establishment Harwell, Oxfordshire, OX 11 0RA, United Kingdom
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Abstract

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Fe57 Mössbauer spectroscopy has been used to determine the nature of iron-containing minerals in Lower Greensand samples from an experimental lysimeter at Uffington, Oxfordshire, both before and after a three-year irrigation with a synthetic heavy metal leachate. Analysis of the spectra measured at 300°, 77°, and 4.2°K and at 4.2°K in an applied field of 45 kOe shows that iron is present in the uncontaminated sandstone in fine-grained goethite (α-FeOOH) and glauconite. In the irrigated samples iron is precipitated as a fine-grained ferric hydroxide gel having values for the hyperfine field at 4.2°K of 435 and 470 kOe. The stability of the gel over the three-year period of irrigation may be explained by surface energy considerations.

Резюме

Резюме

Ре57 Моссбауеровская спектроскопия была использована для определения природы минералов, содержащих железо в образцах Нижнего Зеленого песчаника из экспериментального лизиметра в Аффингтоне, Оксфордшир, перед и после трех-летней ирригации синтетическим раствором тяжелого металла. Анализ спектров, замеренных при 300°, 77°, и 4,2°К и при 4,2°К в поле 45 кОе показывает, что железо присутствует в необработанном песчанике в мелко-зернистом гетите (α-РеООН) и глауконите. В ирригированных образцах железо осаждается в виде мелко-зернистого железно-гидроокисного геля, имеящего значения для сверхтонкого поля 435 и 470 кОе при 4,2°К. Устойчивость геля в течение трех-летнего периода ирригации можно объяснить, приняв во внимание поверхностную энергию. [N. R.]

Resümee

Resümee

Fe57 Mössbauer-Spektroskopie wurde verwendet, um die eisenhaltigen Minerale in Lower Greensand Proben aus einem Versuchslysimeter in Uffington, Oxfordshire, zu bestimmen. Die Untersuchung wurde sowohol vor als auch nach einer dreijährigen Irrigation mit einem synthetischen Schwer-metallauslaugprodukt durchgeführt. Die Auswertung der Spektren, die bei 300°, 77°, und 4,2°K sowie bei 4,2°K in einem angelegten Feld von 45 kOe gemessen wurden, zeigt, daß das Eisen in nicht verunreinigtem Sandstein in Form von feinkörnigem Goethit (α-FeOOH) und Glaukonit vorhanden ist. In den verunreinigten Proben ist das Eisen als feinkörniges Fe3+-Hydroxydgel gefallt, das für das Hyperfeinfeld Werte von 435 und 470 kOe bei 4,2°K hat. Die Stabilität des Gels über einen dreijährigen Zeitraum der Irrigation kann durch Überlegungen über die Oberflächenenergie erklärt werden. [U. W.]

Résumé

Résumé

La spectroscopie Mössbauer Fe57 a été utilisée pour déterminer la nature de minéraux contenant du fer provenant d’échantillons de Bas Greensand d'un lysimètre expérimental à Uffington, Oxfordshire, à la fois avant et après une irrigation de trois années avec un lourd lessivant synthétique. L'analyse des spectres mesurés à 300°, 77°, et 4,2°K et à 4,2°K dans un champ appliqué à 4,5 kOe montre que le fer est présent dans le grès non-contaminé dans la goethite à fins grains (α-FeOOH) et dans la glauconite. Dans les échantillons irrigés, le fer est précipité comme un gel hydroxide ferrique à fins grains ayant pour le champ hyperfin les valeurs 435 et 470 kOe à 4.2°K. La stabilité du gel pendant une période de trois ans peut être expliqué par des considérations d’énergie de surface. [D. J.]

Keywords

GlauconiteGoethiteGreensandIronLysimeterMössbauer spectroscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 28 , Issue 1 , February 1980 , pp. 43 - 49
Copyright
Copyright © Clay Minerals Society 1980

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