/* DATA DESCRIPTION: Citation: Asmala, Eero; Österholm, Peter; Virtasalo, Joonas J (2023): Water quality and geochemical data from Laihianjoki and Sulvanjoki flocculation experiments in April 2021 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.961684, In: Asmala, E et al. (2023): Suspension particle size, water quality and geochemical data from Laihianjoki and Sulvanjoki flocculation experiments in April 2021 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.961683 Abstract: 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. Keyword(s): acid sulphate soils; Baltic Sea; estuaries; Flocculation; Laboratory experiment; Salinity; trace metals Coverage: MEDIAN LATITUDE: 63.038500 * MEDIAN LONGITUDE: 21.682500 * SOUTH-BOUND LATITUDE: 63.034000 * WEST-BOUND LONGITUDE: 21.660000 * NORTH-BOUND LATITUDE: 63.043000 * EAST-BOUND LONGITUDE: 21.705000 DATE/TIME START: 2021-04-13T00:00:00 * DATE/TIME END: 2021-04-13T00:00:00 Event(s): Laihianjoki_water * LATITUDE: 63.043000 * LONGITUDE: 21.705000 * DATE/TIME: 2021-04-13T00:00:00 * LOCATION: Finland * METHOD/DEVICE: Water sample (WS) Sulvanjoki_water * LATITUDE: 63.034000 * LONGITUDE: 21.660000 * DATE/TIME: 2021-04-13T00:00:00 * LOCATION: Finland * METHOD/DEVICE: Water sample (WS) Parameter(s): Type of study (Study type) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) Event label (Event) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) LATITUDE (Latitude) * GEOCODE * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) LONGITUDE (Longitude) * GEOCODE * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) Date/time analysis, experiment (Date/time analysis exp) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) Salinity, absolute [g/kg] (ASAL) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) * METHOD/DEVICE: Multiparameter probe, YSI Xylem Inc., EXO2 (URI: https://www.ysi.com/exo2) Conductivity, specific [µS/cm] (Cond) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) * METHOD/DEVICE: Multiparameter probe, YSI Xylem Inc., EXO2 (URI: https://www.ysi.com/exo2) Replicate (Repl) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) Carbon, organic, particulate [mg/l] (POC) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) * METHOD/DEVICE: Mass spectrometer, Europa Scientific ANCA-MS 20-20 15N/13C Suspended particulate matter [mg/l] (SPM) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) * METHOD/DEVICE: Derived from filter weights Aluminium, particulate [µg/l] (Al part) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) * METHOD/DEVICE: Inductively coupled plasma–optical emission spectrometer (ICP-OES), Thermo Fisher Scientific Inc., iCAP 7400 Cobalt, particulate [µg/l] (Co part) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) * METHOD/DEVICE: Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP Q Copper, particulate [µg/l] (Cu part) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) * METHOD/DEVICE: Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP Q Iron, particulate [µg/l] (Fe part) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) * METHOD/DEVICE: Inductively coupled plasma–optical emission spectrometer (ICP-OES), Thermo Fisher Scientific Inc., iCAP 7400 Manganese, particulate [µg/l] (Mn part) * PI: Asmala, Eero (https://orcid.org/0000-0002-9150-1227, eero.asmala@gtk.fi) * METHOD/DEVICE: Inductively coupled plasma mass spectrometer (ICP-MS), Thermo Fisher Scientific Inc., iCAP Q License: Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) Status: Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels) Size: 432 data points */ Study type Event Latitude Longitude Date/time analysis exp ASAL [g/kg] Cond [µS/cm] Repl POC [mg/l] SPM [mg/l] Al part [µg/l] Co part [µg/l] Cu part [µg/l] Fe part [µg/l] Mn part [µg/l] Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 0.0 248 A 5100 20.8 746 0.102 5.25 604 2.630 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 0.0 248 B 5318 24.4 780 0.072 13.43 570 3.510 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 0.0 248 C 4879 26.6 724 0.026 6.17 580 2.250 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 0.8 1715 A 6072 34.6 1256 0.000 6.87 692 2.130 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 0.8 1715 B 6076 31.6 1294 0.000 17.29 730 2.410 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 0.8 1715 C 6683 39.8 1686 0.000 10.01 958 2.610 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 1.6 3110 A 8372 35.2 1668 0.000 7.69 698 2.190 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 1.6 3110 B 7808 33.6 1778 0.000 6.43 744 1.990 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 1.6 3110 C 7729 32.6 1784 0.000 8.37 752 2.510 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 3.5 6640 A 6850 41.0 2052 0.000 8.41 736 2.490 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 3.5 6640 B 7074 42.0 2112 0.158 10.29 754 2.570 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 3.5 6640 C 7524 43.0 2012 0.100 6.79 692 2.310 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 4.2 7750 A 7086 47.6 2292 0.192 8.47 858 3.010 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 4.2 7750 B 7283 45.4 2112 0.114 9.39 792 2.510 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 4.2 7750 C 8186 50.4 2292 0.152 8.45 858 3.050 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 4.8 8920 A 7035 45.8 2232 0.164 9.45 854 3.170 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 4.8 8920 B 7089 52.8 2192 0.128 15.49 830 3.370 Laboratory experiment Laihianjoki_water 63.043 21.705 2021-04-15 4.8 8920 C 7002 49.0 2172 0.082 8.03 804 3.110 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 0.1 370 A 3470 11.2 332 0.000 5.61 288 0.937 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 0.1 370 B 3624 17.4 612 0.000 5.43 340 1.090 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 0.1 370 C 3990 10.8 790 0.000 32.09 286 0.777 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 1.1 2240 A 5820 18.4 1372 0.132 6.01 460 2.210 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 1.1 2240 B 5204 20.4 1134 0.106 4.65 456 0.955 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 1.1 2240 C 4468 16.8 1356 0.120 11.49 472 1.370 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 2.1 4110 A 7413 38.6 2332 0.134 7.55 540 1.330 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 2.1 4110 B 7272 32.4 2432 0.098 5.97 574 1.570 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 2.1 4110 C 5879 28.2 2412 0.164 19.69 566 3.730 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 3.1 5860 A 7101 34.4 3312 0.084 7.55 580 1.190 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 3.1 5860 B 7689 36.6 3172 0.074 7.99 562 1.190 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 3.1 5860 C 7451 31.8 3212 0.082 10.55 570 1.330 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 4.1 7630 A 8599 49.2 3572 0.052 9.31 588 1.450 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 4.1 7630 B 8422 46.0 3912 0.094 9.35 582 1.930 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 4.1 7630 C 8949 40.4 3852 0.086 13.35 596 8.790 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 5.0 9250 A 8163 45.0 4052 0.114 12.31 600 1.870 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 5.0 9250 B 7701 41.8 4092 0.112 15.49 596 2.030 Laboratory experiment Sulvanjoki_water 63.034 21.660 2021-04-15 5.0 9250 C 7771 46.4 4092 0.114 8.89 616 1.630