Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Geological Survey of Finland GTK http://en.gtk.fi/ https://ror.org/03vjnqy43 Österholm Peter Åbo Akademi University https://ror.org/029pk6x14 Virtasalo Joonas J joonas.virtasalo@gtk.fi 0000-0002-9712-3642 Geological Survey of Finland GTK http://en.gtk.fi/ https://ror.org/03vjnqy43 2023 Water quality and geochemical data from Laihianjoki and Sulvanjoki flocculation experiments in April 2021 dataset https://doi.org/10.1594/PANGAEA.961684 2023-11-09T09:14:24 https://doi.org/10.1594/PANGAEA.961683 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. 21.66 21.705 63.034 63.043 21.68249999999999 63.03850000000005 2021-04-13T00:00:00 2021-04-13T00:00:00 Laihianjoki_water 63.043 21.705 Finland 2021-04-13T00:00:00 Water sample WS Sulvanjoki_water 63.034 21.66 Finland 2021-04-13T00:00:00 Water sample WS 432 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Type of study Study type type Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Study type Event label Event Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Event LATITUDE Latitude http://en.wikipedia.org/wiki/ISO_6709 Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Latitude LONGITUDE Longitude http://en.wikipedia.org/wiki/ISO_6709 Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Longitude Date/time analysis, experiment Date/time analysis exp Time T http://dbpedia.org/resource/Time Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Date/time analysis exp Salinity, absolute ASAL g/kg http://www.teos-10.org absolute Multiparameter probe, YSI Xylem Inc., EXO2 https://www.ysi.com/exo2 Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 ASAL [g/kg] Conductivity, specific Cond µS/cm conductivity http://purl.obolibrary.org/obo/PATO_0001585 specific https://dictionary.cambridge.org/de/worterbuch/englisch/specific Multiparameter probe, YSI Xylem Inc., EXO2 https://www.ysi.com/exo2 Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Cond [µS/cm] Replicate Repl Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Repl Carbon, organic, particulate POC mg/l carbon C https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:27594 organic particulate Density http://dbpedia.org/resource/Density Mass spectrometer, Europa Scientific ANCA-MS 20-20 15N/13C Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 POC [mg/l] Suspended particulate matter SPM mg/l suspended matter https://www.eea.europa.eu/archived/archived-content-water-topic/wise-help-centre/glossary-definitions/suspended-matter Density http://dbpedia.org/resource/Density Derived from filter weights Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 SPM [mg/l] Aluminium, particulate Al part µg/l aluminium Al particulate Density http://dbpedia.org/resource/Density Inductively coupled plasma–optical emission spectrometer (ICP-OES), Thermo Fisher Scientific Inc., iCAP 7400 Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Al part [µg/l] Cobalt, particulate Co part µg/l cobalt particulate Density http://dbpedia.org/resource/Density Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP Q Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Co part [µg/l] Copper, particulate Cu part µg/l copper particulate Density http://dbpedia.org/resource/Density Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP Q Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Cu part [µg/l] Iron, particulate Fe part µg/l particulate Density http://dbpedia.org/resource/Density Inductively coupled plasma–optical emission spectrometer (ICP-OES), Thermo Fisher Scientific Inc., iCAP 7400 Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Fe part [µg/l] Manganese, particulate Mn part µg/l manganese Mn https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:18291 particulate Density http://dbpedia.org/resource/Density Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP Q Asmala Eero eero.asmala@gtk.fi 0000-0002-9150-1227 Mn part [µg/l] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable acid sulphate soils Baltic Sea estuaries Flocculation Laboratory experiment Salinity trace metals author41472 author64375 author76816 curlevel30 event3073453 event3073454 geocode1599 geocode1600 geocode1601 inst1230 inst21234 license21 method11785 method13108 method13923 method15589 method15840 method15842 param101117 param116807 param116809 param129269 param155296 param185520 param514095 param521287 param78613 param88104 param99625 param99626 pi64375 term1073162 term37651 term38338 term38477 term38521 term38841 term40136 term40561 term42085 term42425 term43792 term43975 term44006 term44327 term44419 term47768 term49506 term54471 term60826 term627 term67799 term72759