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• W4386209871 abstract "Abstract Trace elements play a major role in biogeochemical cycles and oceanographic processes. To determine trace element concentrations, the dissolved and particulate phase are usually separated by filtration. However, the frequently used membrane filtration as well as sample storage can bias the dissolved elemental concentrations by adsorption or desorption/contamination. We present a comparison of two filtration methods for coastal and estuarine water samples (pressure filtration with Nuclepore™ polycarbonate filters, vacuum filtration with Digi FILTER™s) applied to aliquots of a large‐volume coastal water sample that were stored at −18°C or 4°C for up to nine weeks. The filtrates were analyzed by sea FAST ‐ICP‐MS for dissolved Cd, Ce, Co, Cu, Dy, Er, Eu, Fe, Ho, La, Mn, Mo, Nd, Pb, Pr, Sm, Tb, U, V, W, Y, and Zn. The filtration blanks of Digi FILTER™s (0.0006 ± 0.0010 ng L −1 for Ho to 110 ± 180 ng L −1 for Zn) were sufficiently low for quantification of all analyzed elements with good repeatability, enabling a fast and reliable filtration of large sample sets of coastal water. However, the findings also highlight the need to measure procedural blanks including the filtration instead of only the instrument blanks to validate results. Measured concentrations of both filtration methods did not differ significantly for Cd, Cu, Mo, U, V, W, Zn but for other investigated elements, the ratio between both methods was up to 1.8 for Ce and 4.1 for Fe. Within nine weeks of storage, the elemental concentrations decreased significantly, resulting in losses of 20% Mn in frozen samples and 63% Pb, 64% Co and 93% Mn in cooled samples. Practitioner Points Two fast and cheap filtration methods for coastal water samples were compared. Dissolved concentrations of 22 elements were measured by sea FAST ‐ICP‐MS. The filtration method is important in addition to filter pore size. Filtration blanks need to be reported to maintain comparability between methods. Cool and frozen storage of water samples biases the dissolved metal concentration." @default.
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• W4386209871 date "2023-09-01" @default.
• W4386209871 modified "2023-10-16" @default.
• W4386209871 title "Impact of storage temperature and filtration method on dissolved trace metal concentrations in coastal water samples" @default.
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• W4386209871 doi "https://doi.org/10.1002/wer.10922" @default.
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