Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1016/j.ecolind.2023.111221 |
Lizenz  |
|
| Titel (primär) | High-frequency soluble reactive phosphorus in-situ analysis in lakes |
| Autor | Dadi, T.; Rinke, K.; Balzer, L.; Kaligatla, R.; Köhler, J.; Schubert, H.; Shen, Q.; Friese, K. |
| Quelle | Ecological Indicators |
| Erscheinungsjahr | 2023 |
| Department | SEEFO |
| Band/Volume | 157 |
| Seite von | art. 111221 |
| Sprache | englisch |
| Topic | T5 Future Landscapes |
| Keywords | High-frequency monitoring; Phosphorus analysis; In-situ wet chemistry; Nutrients dynamics; Lakes; Reservoirs; SRP |
| Abstract | High-frequency in-situ monitoring of nutrients in lakes is increasingly becoming relevant to understand event-driven nutrient pulses better. These pulses are essential for phytoplankton development but are usually not captured during conventional sampling programs. In-situ monitoring of nutrients in lakes has been lagging despite the role of nutrients in eutrophication. We evaluated an in-situ wet chemistry soluble reactive phosphorus (SRP) analyzer to establish a methodological basis for high-frequency measurements of SRP. The device (based on the molybdate blue method) was evaluated in laboratory and field tests by comparing it with conventional laboratory analysis. The results of the in-situ analyser during laboratory were similar to the conventional analysis (R2 > 0.995, NSE = 0.989, PBIAS = 8.4 %). Repeated measurements by the in-situ analyzer in a 0.1 mg L-1 test solution had a mean and standard deviation of 0.1005 ± 0.0047 and a MAPE of 3.39, indicating the stability of the measurements. During field tests in a hypertrophic lake with anoxic hypolimnion, the in-situ analyzer SRP concentrations were lower and divergent from the laboratory analysis; due to potential interference of the in-situ analyzer's reagents by sulfides. Under aerobic conditions during field tests, the in-situ P results of a eutrophic, mixed shallow lake were similar to those from water samples analyzed in the laboratory (R2 = 0.562 – 0.812, NSE = 0.397 – 0.707, PBIAS = -8.5 – 24.6 %). There was no difference in SRP concentration among the unfiltered, 0.2 µm, and 10 µm pore size filtered samples; filter pore size did not play a role in the measured SRP concentrations. The in-situ SRP analyzer revealed previously unobserved phenomena, e.g., multiple strongly discontinuous SRP peaks reaching almost 0.1 mg L-1; it therefore, offers a solid methodological basis for high-frequency monitoring of SRP. Incorporating high-frequency in-situ nutrient analysis in lake monitoring provides insights into lakes' short-term nutrient dynamics. Such information is essential for understanding the effects of extreme events like droughts, storms, and heat waves. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=28222 |
| Dadi, T., Rinke, K., Balzer, L., Kaligatla, R., Köhler, J., Schubert, H., Shen, Q., Friese, K. (2023): High-frequency soluble reactive phosphorus in-situ analysis in lakes Ecol. Indic. 157 , art. 111221 10.1016/j.ecolind.2023.111221 |
|