Effect of the Dry Ashing Method on Cadmium Isotope Measurements in Soil and Plant Samples,Geostandards and Geoanalytical Research

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Effect of the Dry Ashing Method on Cadmium Isotope Measurements in Soil and Plant Samples
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-09-02 , DOI: 10.1111/ggr.12357
Wei‐Xin Lv ₁ , Hao‐Ming Yin ₁ , Meng‐Shu Liu ₁ , Fang Huang _{1,

2} , Hui‐Min Yu _{1,

2}

Affiliation

A dry ashing method is commonly used to remove organic material from samples prior to geochemical analysis. In the course of this study, the Cd isotope ratios of a series of soil and plant reference materials and samples were studied to evaluate the effect of the dry ashing method on measurement results of Cd isotope ratios. The samples were pre‐treated using the dry ashing method and high‐pressure bomb for comparison. The results show that the digestion using high‐pressure bombs did not lead to Cd loss, but using the dry ashing method would cause different proportions of Cd loss. The whole range of Cd isotope difference between two methods was from −0.07‰ to 3.01‰. There was also an obvious difference in measured Cd isotope ratios from the same leaf sample pre‐treated independently by the dry ashing method, indicating that the amount of Cd loss and the effect on Cd isotope measurement during dry ashing is related to the properties of the samples. Therefore, dry ashing may not be appropriate for the removal of organic material in Cd isotope ratio measurement, especially for samples with high organic contents. The δ^114/110Cd values of reference materials NIST SRM 1573a and GSD‐30 are reported for the first time in this study.

中文翻译：

干灰化方法对土壤和植物样品中镉同位素测量的影响

在地球化学分析之前，通常使用干灰化方法从样品中去除有机物质。在本研究过程中，研究了一系列土壤和植物参考材料及样品的Cd同位素比，以评价干灰法对Cd同位素比测量结果的影响。使用干灰化方法和高压炸弹对样品进行预处理以进行比较。结果表明，使用高压炸弹消解并不会导致Cd的损失，但采用干灰法会导致Cd损失的比例不同。两种方法之间Cd同位素差的总范围为-0.07‰至3.01‰。通过干灰化方法独立预处理的同一叶片样品的Cd同位素比值也存在明显差异，表明干灰化过程中Cd的损失量和对Cd同位素测量的影响与样品的性质有关。因此，在Cd同位素比测量中，干灰化可能不适用于去除有机物，特别是对于高有机物含量的样品。δ在这项研究中首次报道了参考材料NIST SRM 1573a和GSD-30的^114/110 Cd值。

更新日期：2020-09-02

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