A modification of energy dispersive X-ray fluorescence (ED-XRF) for analysis of trace element concentrations in suspended particulate matter (SPM) in seawater and intercomparison with high-resolution inductively coupled plasma-mass spectrometry (HR ICP-MS) is presented. Approximately 250 SPM samples were collected on polycarbonate track-etched filters in the Indian Ocean during the U.S. CLIVAR/CO₂ Repeat Hydrography meridional section I09N cruise in 2007. Samples were first analyzed by ED-XRF, a nondestructive technique, for Al, P, Ti, Mn, Fe, Ni, Cu, and Zn and subsequently digested and quantified by HR ICP-MS, creating two blind, basin-scale data sets used for a paired statistical comparison. Our results found (1) ED-XRF analysis using thin-film principles can quantify the elemental composition of SPM at nanomolar concentrations found in the open ocean; (2) there was excellent agreement between ED-XRF and HR ICP-MS analyses for Al, Fe, and Mn and good agreement for P and Ti; (3) analytical differences were the largest for Cu, Ni, and Zn; (4) HR ICP-MS methods have lower detection limits for most elements when compared to the ED-XRF; (5) ED-XRF analysis has a closer agreement to reported values for the NIST SRM 2783 standard and lower relative standard deviations when compared to the HR ICP-MS. We recommend continued refinement of nondestructive ED-XRF methods as this would allow for the easy exchange of filtered samples between lab groups for intercalibration and intercomparison of basin-scale hydrographic cruises and archival for future analysis.

中文翻译：

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能量色散 X 射线荧光方法和分析海水中悬浮颗粒物的微量元素成分以及与高分辨率电感耦合等离子体质谱法的比对

介绍了一种改进的能量色散 X 射线荧光 (ED-XRF)，用于分析海水中悬浮颗粒物 (SPM) 中的微量元素浓度，并与高分辨率电感耦合等离子体质谱 (HR ICP-MS) 进行比对。在美国 CLIVAR/CO ₂期间，在印度洋的聚碳酸酯径迹蚀刻过滤器上收集了大约 250 个 SPM 样品2007 年重复水文经向剖面 I09N 巡航。首先使用 ED-XRF（一种无损技术）分析样品中的铝、磷、钛、锰、铁、镍、铜和锌，随后通过 HR ICP-MS 进行消解和定量，创建用于配对统计比较的两个盲目的流域尺度数据集。我们的结果发现 (1) 使用薄膜原理的 ED-XRF 分析可以量化在公海中发现的纳摩尔浓度下 SPM 的元素组成；(2) ED-XRF 和 HR ICP-MS 对 Al、Fe 和 Mn 的分析具有极好的一致性，对 P 和 Ti 的一致性很好；(3) Cu、Ni、Zn的分析差异最大；(4) 与 ED-XRF 相比，HR ICP-MS 方法对大多数元素具有更低的检测限；(5) 与 HR ICP-MS 相比，ED-XRF 分析与 NIST SRM 2783 标准的报告值更接近，并且相对标准偏差更低。我们建议继续改进无损 ED-XRF 方法，因为这将允许在实验室组之间轻松交换过滤样本，以进行流域尺度水文航行和存档的相互校准和相互比较，以备将来分析。