Laboratory intercomparison of marine particulate digestions including Piranha: a novel chemical method for dissolution of polyethersulfone filters
Laboratory intercomparison of marine particulate digestions including Piranha: a novel chemical method for dissolution of polyethersulfone filters
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包括食人鱼在内的海洋颗粒消化的实验室比对：一种溶解聚醚砜过滤器的新型化学方法
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发表时间：
2014
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通讯作者：
P. Lam
中科院分区：
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作者：
D. Ohnemus;M. Auro;R. Sherrell;Maria Lagerström;P. Morton;B. Twining;Sara Rauschenberg;P. Lam
美国的GEOTRACES计划将产生以前从未采样过的空间尺度和深度分辨率的海洋颗粒痕量金属数据。在准备这些分析，我们进行了四个实验室相互比较的练习，以确定我们的相互校准程度，并检查几个总消化程序如何执行对海洋颗粒收集的聚醚砜（PES，颇苏泊尔）过滤器。此外，我们提出了一种新的化学方法，使用硫酸和过氧化氢的组合完全溶解PES过滤器，称为Piranha试剂，可以使用最少的专用设备进行。对于代表约10 L过滤海水的子样本，142 mm颗粒物过滤器的实验室内子样本变异性测量为元素依赖性1%至9%（RSD：1δ/x-，%），而实验室间变异性占额外变异性的5%至42%。讨论了回收率的实验室和元素特定趋势，尽管所有测试的消解方法似乎都能完全溶解颗粒材料。我们建议对消化酸和/或过滤工艺空白进行严格测定，因为某些颗粒元素（即Pb和Zn）的天然丰度接近空白值。
The US GEOTRACES program will generate marine particulate trace metal data over spatial scales and depth resolutions never before sampled. In preparation for these analyses, we conducted a four laboratory intercomparison exercise to determine our degree of intercalibration and to examine how several total digestion procedures perform on marine particles collected on polyethersulfone (PES, Pall Supor) filters. In addition, we present a new chemical method for complete dissolution of PES filters using a combination of sulfuric acid and hydrogen peroxide called Piranha reagent that can be conducted using minimal specialized equipment. Intralaboratory subsampling variability across 142 mm particulate matter filters, for subsamples representing approximately 10 L filtered seawater, was measured at an element‐dependent 1% to 9% (RSD: 1δ/x-, %), whereas interlaboratory variability accounted for an additional 5% to 42% variability. Lab‐ and element‐specific trends in recoveries are discussed, though all digestion methods tested appear to completely solubilize particulate material. We recommend rigorous determination of digest‐acid and/or filter process blanks, as some particulate elements (namely Pb and Zn) have natural abundances that approach blank values.