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张兴超, 刘超, 黄艺, 黄方, 于慧敏. 干法灰化处理对含有机质土壤样品铜同位素测量的影响[J]. 岩矿测试, 2018, 37(4): 347-355. DOI: 10.15898/j.cnki.11-2131/td.201803290033
引用本文: 张兴超, 刘超, 黄艺, 黄方, 于慧敏. 干法灰化处理对含有机质土壤样品铜同位素测量的影响[J]. 岩矿测试, 2018, 37(4): 347-355. DOI: 10.15898/j.cnki.11-2131/td.201803290033
Xing-chao ZHANG, Chao LIU, Yi HUANG, Fang HUANG, Hui-min YU. The Effect of Dry-Ashing Method on Copper Isotopic Analysis of Soil Samples with Organic Matter[J]. Rock and Mineral Analysis, 2018, 37(4): 347-355. DOI: 10.15898/j.cnki.11-2131/td.201803290033
Citation: Xing-chao ZHANG, Chao LIU, Yi HUANG, Fang HUANG, Hui-min YU. The Effect of Dry-Ashing Method on Copper Isotopic Analysis of Soil Samples with Organic Matter[J]. Rock and Mineral Analysis, 2018, 37(4): 347-355. DOI: 10.15898/j.cnki.11-2131/td.201803290033

干法灰化处理对含有机质土壤样品铜同位素测量的影响

The Effect of Dry-Ashing Method on Copper Isotopic Analysis of Soil Samples with Organic Matter

  • 摘要: 分析土壤样品的铜同位素时,其中有机质会对化学纯化流程以及测试过程产生严重的干扰。因此,在不改变样品铜同位素组成的前提下,完全去除土壤中的有机质对于获取高精度的铜同位素数据至关重要。干法灰化是一种快速、有效的有机质处理方法,并且能够减少氧化性试剂的使用。但是该流程可能会对挥发性元素(如铜)的组成产生影响,因此需要在使用前进行条件实验探究。本文采用干法灰化流程对含有机质的土壤样品进行有机质处理,同时使用高压湿法消解对相同的样品进行处理,并分别在纯化后用MC-ICP-MS测量铜同位素组成,通过两种处理方式测量结果的对比,探求干法灰化法对土壤样品铜同位素组成的影响程度。结果表明:高压湿法消解流程能够获得较为可靠的铜同位素组成数据;干法灰化流程使铜同位素组成的测量值显著偏离真实值,δ65Cu最多可偏差3.46‰。这是因为样品中铜的挥发丢失导致了铜同位素组成发生分馏,并且其影响程度受到了多种因素控制,如样品性质和灰化温度等。因此,实验结果更推荐使用湿法消解对土壤样品进行处理。

     

    Abstract:
    BACKGROUNDWhen analyzing copper isotopes in soil samples, organic matter can cause serious interference on chemical purification and analysis processes. Therefore, the complete removal of organic matter from the soil is critical to obtain high-precision copper isotope data without changing the copper isotope composition of the sample.
    OBJECTIVESTo carry out the condition experiments before using the dry-ashing method, because the method may influence the compositions of volatile elements, such as Cu, in soil samples.
    METHODSSoil samples containing organic matter were treated by dry-ashing and then digested by the high-pressure wet digestion method. The copper isotope composition was measured by Multi-collector Inductively Coupled Plasma-Mass Spectrometry after purification. Through the comparison of the results of the two treatment methods, the extent of influence of the dry-ashing method on the copper isotopic composition of soil samples was investigated.
    RESULTSThe results demonstrate that the wet-digestion method can provide more precise results, while the dry-ashing method can significantly fractionate Cu isotopes of soil samples. The deviation of δ 65Cu values varies from -0.61‰ to 3.46‰ for the dry-ashing method, which was caused by volatilization loss of Cu. Moreover, the degree of influence is controlled by a few factors such as sample nature and ashing temperature.
    CONCLUSIONSThe dry-ashing method is not an appropriate method for soil sample digestion. The wet-digestion method is a better choice to prepare samples for Cu isotopic analysis.

     

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