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选择性提取碱土金属元素的方法对比及意义

黄晶 郑童童 王爱华 栗文静 王张华

黄晶, 郑童童, 王爱华, 栗文静, 王张华. 选择性提取碱土金属元素的方法对比及意义[J]. 华东师范大学学报(自然科学版), 2021, (2): 73-84. doi: 10.3969/j.issn.1000-5641.2021.02.008
引用本文: 黄晶, 郑童童, 王爱华, 栗文静, 王张华. 选择性提取碱土金属元素的方法对比及意义[J]. 华东师范大学学报(自然科学版), 2021, (2): 73-84. doi: 10.3969/j.issn.1000-5641.2021.02.008
HUANG Jing, ZHENG Tongtong, WANG Aihua, LI Wenjing, WANG Zhanghua. Comparison of different extraction methods for alkaline earth metals and its implications: A case study of the surficial sediments from Ningbo Plain[J]. Journal of East China Normal University (Natural Sciences), 2021, (2): 73-84. doi: 10.3969/j.issn.1000-5641.2021.02.008
Citation: HUANG Jing, ZHENG Tongtong, WANG Aihua, LI Wenjing, WANG Zhanghua. Comparison of different extraction methods for alkaline earth metals and its implications: A case study of the surficial sediments from Ningbo Plain[J]. Journal of East China Normal University (Natural Sciences), 2021, (2): 73-84. doi: 10.3969/j.issn.1000-5641.2021.02.008

选择性提取碱土金属元素的方法对比及意义

doi: 10.3969/j.issn.1000-5641.2021.02.008
基金项目: 国家自然科学基金(41576042)
详细信息
    通讯作者:

    王张华, 女, 教授, 博士生导师, 研究方向为河口-三角洲古环境及人地关系.E-mail: zhwang@geo.ecnu.edu.cn

  • 中图分类号: P595

Comparison of different extraction methods for alkaline earth metals and its implications: A case study of the surficial sediments from Ningbo Plain

  • 摘要: 在古环境研究中, Sr、Ba、Ca等碱土金属元素在沉积物中的含量及比值是一种较为常用的、识别海陆相环境的指标. 但元素多赋存于矿物晶格中, 而这些矿物基本上存在于酸提取后的残渣态中, 与沉积物沉积时的物理-生物-化学环境没有直接关系. 因此, 选择性提取沉积物中与沉积环境相关的碱土金属元素, 才能将该方法更好地应用于解释沉积环境. 本研究采集了宁波平原盐沼潮滩、河漫滩、感潮河道3种环境的表层沉积物, 采用等离子光谱仪测试了稀醋酸和稀盐酸提取液、酸提取后剩余残渣以及全量的Sr、Ba、Ca含量. 结果表明: 醋酸提取态对沉积环境变化最为敏感, 盐酸提取态次之, 全量Sr/Ba(摩尔比)无法区分3类表层沉积物的沉积环境; 用不同的样品量和仪器测量验证醋酸提取态的效果, 显示结果稳定. 此外, 宁波平原及邻近岛屿盐沼潮滩表层沉积物醋酸法提取的Ca和Sr浓度远高于河漫滩沉积物和山麓黄土, 感潮河道则介于两者之间, Ba的分布与Ca、Sr相反. 因此, 通过醋酸态碱土金属元素的端元分析, 可以有效地识别海岸带地层的海陆沉积环境演变.
  • 图  1  宁波平原地貌状况和表层样分布

    Fig.  1  Geomorphology of Ningbo Plain and the sampling locations

    图  2  表层样Ca、Sr、Ba酸提取态和残渣与全量提取对比

    Fig.  2  Comparison of Ca, Sr, and Ba between the acid-leachates + residues and the bulk samples of the surficial sediments

    图  3  表层样Ca、Sr和Ba元素含量箱线图、酸提取态占全量的百分比以及变异系数

    Fig.  3  Box-and-whisker plots of Ca, Sr, and Ba for the surficial sediments, percentage of the acid-leachates relative to the bulk sample, and the coefficient of variation

    图  4  表层样Sr/Ba箱线图及3种方法的变异系数

    Fig.  4  Box-and-whisker plots of Sr/Ba molar ratios for the surficial sediments and the coefficient of variation for the three extraction methods

    图  5  醋酸提取法表层样Ca、Sr、Ba含量和Sr/Ba 的ICP-AES与ICP-OES结果对比

    Fig.  5  Comparison of Ca, Sr, Ba, and Sr/Ba in the HAc-leachates of the surficial sediments measured by ICP-AES and ICP-OES

    图  6  醋酸提取态碱土金属元素含量及比值散点图

    Fig.  6  Bi-plots of alkaline earth metals in the HAc-leachates and their ratios

    表  1  ICP-AES测得河漫滩、盐沼潮滩、感潮河道表层样的醋酸提取态Ca、Sr、Ba含量和Sr/Ba

    Tab.  1  Ca, Sr, Ba, and Sr/Ba molar ratios in the HAc-leachates of surficial sediments collected from the alluvial plain, saltmarsh-tidal flat, and tidal river measured using ICP-AES

    表层样Ca/ (g·kg–1)Sr/ (mg·kg–1)Ba / (mg·kg–1)Sr/Ba
    MinMaxMeanMinMaxMeanMinMaxMeanMinMaxMean
    河漫滩0.1465.2071.579 0.81418.2988.914 12.347100.38348.583 0.1020.6970.294
    潮滩26.22528.46127.16739.94643.76241.3596.2668.0166.9817.9049.9919.350
    感潮河道9.5669.5669.56618.19318.19318.19311.39311.39311.3932.5032.5032.503
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  • 收稿日期:  2020-03-26
  • 刊出日期:  2021-03-30

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