de.pangaea.dataset961684 und de.pangaea.dataset961683 dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-04-30T21:20:59Z https://doi.pangaea.de/10.1594/PANGAEA.961684 2023-11-09T09:14:24 publication https://doi.org/10.1594/PANGAEA.961684 Asmala, Eero

eero.asmala@gtk.fi

https://orcid.org/0000-0002-9150-1227 information author Österholm, Peter author Virtasalo, Joonas J

joonas.virtasalo@gtk.fi

https://orcid.org/0000-0002-9712-3642 information author PANGAEA

info@pangaea.de

https://www.pangaea.de/ information publisher tableDigital Water samples were collected from the Laihianjoki and Sulvanjoki rivers in April 2021, using a bucket and transferred to 30 L acid-washed containers. The sampling was conducted during springtime, a few weeks after the peak flow caused by snow smelt. The collected river waters were immediately analyzed for pH, temperature, electrical conductivity, and salinity using a WTW Multiline P4 meter. The samples were then transported to the Tvärminne field station of the University of Helsinki, where laboratory experiments began within 24 hours. A large-volume bucket experiment was conducted to study the dynamics of suspended particle size distribution and associated nutrients during the transition from fresh to brackish water conditions. Artificial seawater with salinity of 66.8 g kg-1 was added to river water in an acid-washed basin, while changes in water chemistry and particle size distribution were continuously monitored using a multiparameter water quality sonde and a laser-diffraction particle size analyzer. Additionally, small-volume jar experiments were performed to collect particle samples under controlled conditions using a flocculator apparatus. The collected material was analyzed, and the filtrate was used for further analysis of colored dissolved organic matter. Triplicate samples from flocculator experiments were acidified and analyzed for metal concentrations using an inductively coupled plasma optical emission spectrometer (ICP-OES) and an inductively coupled plasma mass spectrometer (ICP-MS). Filtrate samples were measured for colored dissolved organic matter (CDOM) absorbance and fluorescence using a spectrophotometer and a spectrofluorometer, respectively. Particulate organic carbon (POC) and particulate organic-bound metals were analyzed in filter retentate samples using a mass spectrometer and ICP-MS. Total suspended matter (TSM) was determined by filtering and weighing samples. The apparent particle density was calculated by dividing TSM by volumetric concentrations measured by a laser-diffraction particle size analyzer. However, the density results are biased as particles larger than the detection limit of the instrument are not included in the analysis. completed Asmala, Eero

eero.asmala@gtk.fi

https://orcid.org/0000-0002-9150-1227 information principalInvestigator acid sulphate soils Baltic Sea estuaries Flocculation Laboratory experiment Salinity trace metals theme 1995-01-01 creation PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation 21.66 21.705 63.034 63.043 2021-04-13T00:00:00 2021-04-13T00:00:00 Type of study thematicClassification Event label thematicClassification LATITUDE thematicClassification LONGITUDE thematicClassification Date/time analysis, experiment thematicClassification Salinity, absolute physicalMeasurement Multiparameter probe, YSI Xylem Inc., EXO2 g/kg g/kg Conductivity, specific physicalMeasurement Multiparameter probe, YSI Xylem Inc., EXO2 µS/cm µS/cm Replicate thematicClassification Carbon, organic, particulate physicalMeasurement Mass spectrometer, Europa Scientific ANCA-MS 20-20 15N/13C mg/l mg/l Suspended particulate matter physicalMeasurement Derived from filter weights mg/l mg/l Aluminium, particulate physicalMeasurement Inductively coupled plasma–optical emission spectrometer (ICP-OES), Thermo Fisher Scientific Inc., iCAP 7400 µg/l µg/l Cobalt, particulate physicalMeasurement Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP Q µg/l µg/l Copper, particulate physicalMeasurement Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP Q µg/l µg/l Iron, particulate physicalMeasurement Inductively coupled plasma–optical emission spectrometer (ICP-OES), Thermo Fisher Scientific Inc., iCAP 7400 µg/l µg/l Manganese, particulate physicalMeasurement Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP Q µg/l µg/l text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.961684?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: Laihianjoki_water * LATITUDE: 63.043000 * LONGITUDE: 21.705000 * DATE/TIME: 2021-04-13T00:00:00 * LOCATION: Finland * METHOD/DEVICE: Water sample 2021-04-13T00:00:00 EVENT LABEL: Sulvanjoki_water * LATITUDE: 63.034000 * LONGITUDE: 21.660000 * DATE/TIME: 2021-04-13T00:00:00 * LOCATION: Finland * METHOD/DEVICE: Water sample 2021-04-13T00:00:00