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首页> 外文期刊>Oceanographic Literature Review >A novel method to measure calcium carbonate with portable X-ray fluorescence instrumentation and its application to Gulf of Mexico surficial sediments
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A novel method to measure calcium carbonate with portable X-ray fluorescence instrumentation and its application to Gulf of Mexico surficial sediments

机译：一种用便携式X射线荧光仪器测定碳酸钙的新方法及其在墨西哥曲面沉积物的应用中的应用

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摘要

A novel, rapid, low cost, non-destructive and reliable technique was developed to simultaneously measure calcium carbonate (CaCO_3) and trace element concentrations in sediments with a portable X-ray fluorescence (pXRF) analyzer, and applied to 27 samples of surficial sediments collected from the Yucatan continental shelf (<230 m water depth) and 33 samples from deep sediments (> 1200 m water depth) of the Gulf of Mexico. This technique is based on calculation of authigenic calcium (Ca_(auth)) from the total Ca measured with the pXRF. Results obtained with the pXRF showed a very high and highly significant correlation (r = 0.99, P < 0.001) with measurements of inorganic carbon (C_i) obtained by coulometry, with a slope of 0.972 ±0.014 SD and negative Y-intercept of-0.403 ± 0.093 SD. The latter is consistent with the presence of carbonates unrelated to Ca (e.g., MgCOj, SrCO_3, MnCO_3, FeCO_3) that were not detected by the pXRF. Statistical analysis indicated that the means of C_i and C_(auth) did not differ significantly, thus yielding reliable measurements with the pXRF. The C_i concentrations can be calculated directly from C_(auth) or, alternatively, from several sediment samples measured by coulometry (or other reliable method) whereby C_i can be calculated from the linear regression between these two parameters. Finally, C_(auth) and titanium showed an inverse relationship, suggesting that carbonates act as diluents of terrigenous material, especially in the western side of the Gulf of Mexico where riverine transport of this land-derived material is more intense.
机译：开发了一种新颖的，快速，低成本，无损和可靠的技术，以同时测量碳酸钙（CaCO_3）和沉积物中的散粒浓度与便携式X射线荧光（PXRF）分析仪，并施加到27个表面沉积物样品从尤卡坦大陆架（水深）和来自墨西哥湾的深层沉积物（> 1200米水深）的33个样品收集。该技术基于从用PXRF测量的总Ca的基因钙（CA_（验证））计算。用PXRF获得的结果显示出非常高且高度显着的相关性（R = 0.99，P <0.001），测量由库仑法获得的无机碳（C_I），斜率为0.972±0.014 SD和负Y截止值-0.403 ±0.093 SD。后者与PXRF未检测到的与Ca（例如，MgCOJ，SrCO_3，MNCO_3，FECO_3）不相关的碳酸酯的存在一致。统计分析表明C_I和C_（AUTH）的手段没有显着差异，从而产生了PXRF的可靠测量。 C_I浓度可以直接从C_（AUTH）计算，或者，或者，从由库仑测量（或其他可靠方法）测量的几个沉积物样本，由此可以根据这两个参数之间的线性回归来计算C_I。最后，C_（验证）和钛表现出反比关系，表明碳酸盐作为危害物质的稀释剂，特别是在墨西哥湾的西侧，这种陆地衍生材料的河流运输更加激烈。

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  • 来源
    《Oceanographic Literature Review》 |2020年第9期|1913-1913|共1页
  • 作者

    J. Garcia- Orozco; M.A. Huerta- Diaz; J.A. Valdivieso- Ojeda;

  • 作者单位

    Institute de Investigaciones Oceanologicas UABC Apdo. Postal 453 Ensenada Baja California 22800 Mexico;

    Institute de Investigaciones Oceanologicas UABC Apdo. Postal 453 Ensenada Baja California 22800 Mexico;

    Institute de Investigaciones Oceanologicas UABC Apdo. Postal 453 Ensenada Baja California 22800 Mexico;

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