Total organic carbon quantification in soils and sediments: Performance test of a modified sample preparation method

IF 1.6 Q2 MULTIDISCIPLINARY SCIENCES MethodsX Pub Date : 2024-08-30 DOI:10.1016/j.mex.2024.102934

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Abstract

The total organic carbon (TOC) concentration of particulate samples is a key parameter to characterize soils and sediments. To demonstrate the applicability and reliability of a modified sample preparation method for the direct measurement of TOC contents in suspended particulate samples, we analyzed five certified reference materials (CRMs) with varying TOC concentrations using a Shimadzu TOC-L CPH analyzer. Measured values were calibrated with a multi-point curve that cover the full range of the expected TOC concentrations and the results were validated using statistical values and measures. The method validation reveals that the measurements are accurate and precise for CRMs from marine and soil contexts, but show a low accuracy for the CRM containing polycyclic aromatic hydrocarbons (PAHs). This demonstrates the applicability and reliability of the modified preparation method for direct TOC determination of suspended particulate samples. Therefore, it is relevant for a broader community, beyond geosciences, and for users employing devices of other manufacturers to analyze TOC in suspended particulate samples.

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Modified preparation method uses reduced sample weights and yields accurate and precise results.
•
Cost-efficient and environmentally friendly alternative: reduces waste by saving acid and ultrapure water.
•
Avoids incomplete dissolution of dolomite by heating acidified samples.

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土壤和沉积物中的总有机碳定量：改良样品制备方法的性能测试

颗粒样本的总有机碳（TOC）浓度是表征土壤和沉积物特征的一个关键参数。为了证明改进后的样品制备方法在直接测量悬浮颗粒样品中 TOC 含量方面的适用性和可靠性，我们使用岛津 TOC-L CPH 分析仪分析了五种不同 TOC 浓度的有证标准物质 (CRM)。测量值通过多点曲线进行校准，该曲线涵盖了所有预期的 TOC 浓度范围，并使用统计值和测量方法对结果进行了验证。方法验证结果表明，对海洋和土壤中的有证有机污染物的测量准确而精确，但对含有多环芳烃（PAHs）的有证有机污染物的测量精度较低。这表明改进后的制备方法适用于直接测定悬浮颗粒样本中的 TOC，而且非常可靠。因此，该方法不仅适用于地质科学领域，还适用于使用其他制造商设备分析悬浮颗粒样本中 TOC 的用户。

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