| 海相沉积物碳酸盐相中微量元素的分析方法研究 |
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| 引用本文： | 加丽森·依曼哈孜,邱海鸥,王奥,王大波,汤少展,汤志勇.海相沉积物碳酸盐相中微量元素的分析方法研究[J].岩矿测试,2013,32(4):627-631. |
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| 作者姓名： | 加丽森·依曼哈孜 邱海鸥 王奥 王大波 汤少展 汤志勇 |
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| 作者单位： | 1. 中国地质大学(武汉)材料与化学学院,湖北武汉430074;新疆维吾尔自治区矿产实验研究所,新疆乌鲁木齐830000
2. 中国地质大学(武汉)材料与化学学院,湖北武汉,430074 |
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| 基金项目： | 国家自然科学基金资助项目(41172312) |
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| 摘 要： | 海相沉积物中自生沉积碳酸盐相的微量元素携带极为丰富的原始地质信息,然而海相沉积物中碳酸盐相的测定还没有建立统一的标准方法.本文以修正的Tessier七步提取流程为基础,以电感耦合等离子体质谱法(ICP-MS)为检测手段,针对海相沉积物碳酸盐相组分中V、Cr、Co、Ni、Sr五种微量元素建立了分级提取方法.实验以海相沉积物样品和标准物质作为参考样品,对比了NaAc和EDTA提取碳酸盐相的效果.结果表明,NaAc不能完全提取出沉积物碳酸盐相中的微量元素；EDTA可以较好地提取自生海相沉积物碳酸盐相中的微量元素,但是由于其络合能力太强还会提取有机物结合态的金属元素.本研究确定的分级提取方法是:首先用中性盐NaC1去除离子交换态,然后用提取专一性较强的焦磷酸钠(pH =10)去除有机态,再用EDTA提取仅自生海相沉积物的碳酸盐相.方法精密度(RSD)均＜5％,各元素的检出限在0.5～ 4.3 ng/g之间,回收率在88.0％ ～ 101.6％之间,方法的选择性和稳定性能够满足地球化学样品形态分析的要求.
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| 关 键 词： | 海相沉积物 碳酸盐相 微量元素 焦磷酸钠 EDTA 电感耦合等离子体质谱法 |
| 收稿时间： | 2013/2/27 0:00:00 |
| 修稿时间： | 2013/3/12 0:00:00 |
Method for the Determination of Trace Elements in the Carbonate Fraction of Marine Sediments |
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| YIMANHAZI Jia-li-sen,QIU Hai-ou,WANG Ao,WANG Da-bo,TANG Shao-zhan and TANG Zhi-yong.Method for the Determination of Trace Elements in the Carbonate Fraction of Marine Sediments[J].Rock and Mineral Analysis,2013,32(4):627-631. |
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| Authors: | YIMANHAZI Jia-li-sen QIU Hai-ou WANG Ao WANG Da-bo TANG Shao-zhan and TANG Zhi-yong |
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| Institution: | Faculty of Material Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;Xinjiang Institute of Geology and Mineral Resources, Urumqi 830000, China;Faculty of Material Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;Faculty of Material Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;Faculty of Material Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;Faculty of Material Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China;Faculty of Material Science and Chemistry, China University of Geosciences (Wuhan), Wuhan 430074, China |
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| Abstract: | Trace elements in the carbonate of marine sediments carry abundant original geological information. However, there is no uniform standard method for the determination of carbonate in marine sediments. In this paper, an extraction method is described for five kinds of trace elements (V, Cr, Co, Ni and Sr) of carbonate phase in the marine sediments by using Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), which is based on the modified seven steps extraction processes by Tessier. Two extraction agents (EDTA and NaAc) were used to extract carbonate fraction for marine sediment samples and standard materials. The results indicate that the NaAc cannot be used to fully extract the trace elements from the carbonate phase in sediments. The EDTA can better extract the carbonate phase of marine sediments, but organic complex metals were also extracted based on the strong complexation ability for metallic elements. In this experiment, we initially removed the ion exchange state by using NaCl and excluding the organic material by pyrophosphate (pH=10) which was an extractant with strong selectivity. Next, the terragenous carbonate of marine sediments was extracted by EDTA. The precision of the method was less than 5%, the detection limit of each element was in the range of 0.5-4.3 ng/g, and the recoveries were between 88.0%-101.6%. Selectivity and stability of the method meet the requirements of geochemical sample morphological analysis. |
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| Keywords: | marine sediments carbonate phase trace elements sodium pyrophosphate EDTA Inductively Coupled Plasma-Mass Spectrometry |
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