Assessment of a portable UV-Vis spectrophotometer's performance for stream water DOC and Fe content monitoring in remote areas
| Autor: | Markku Keinänen, Kimmo Neitola, Frank Berninger, Hjalmar Laudon, Mikko Kiirikki, Xudan Zhu, Jukka Pumpanen, Marjo Palviainen, Anne Ojala, Liang Chen |
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| Přispěvatelé: | Ecosystems and Environment Research Programme, Helsinki Institute of Sustainability Science (HELSUS), Viikki Plant Science Centre (ViPS), Anne Ojala / Principal Investigator, Ecosystem processes (INAR Forest Sciences), Institute for Atmospheric and Earth System Research (INAR), Forest Soil Science and Biogeochemistry, Department of Forest Sciences, Forest Ecology and Management, INAR Physics, Polar and arctic atmospheric research (PANDA) |
| Rok vydání: | 2020 |
| Předmět: |
Multivariate statistics
Watershed 116 Chemical sciences 02 engineering and technology 01 natural sciences HIGH-FREQUENCY WAVE Analytical Chemistry Absorbance Spectrophotometry ABSORBENCY Dissolved organic carbon ABSORPTION medicine Calibration Dissolved organic matter DISSOLVED ORGANIC-CARBON Absorption (electromagnetic radiation) medicine.diagnostic_test Chemistry IRON 010401 analytical chemistry QUANTIFICATION Ferric iron 021001 nanoscience & nanotechnology EXPORT 6. Clean water 0104 chemical sciences CATCHMENTS Water quality Environmental chemistry Spectral absorbance RADIATION 0210 nano-technology MATTER UV-Vis spectrophotometer |
| Zdroj: | Talanta. 224 |
| ISSN: | 1873-3573 |
| Popis: | Quantification of dissolved organic carbon (DOC) and iron (Fe) in surface waters is critical for understanding the water quality dynamics, brownification and carbon balance in the northern hemisphere. Especially in the remote areas, sampling and laboratory analysis of DOC and Fe content at a sufficient temporal frequency is difficult. Ultraviolet-visible (UV-Vis) spectrophotometry is a promising tool for water quality monitoring to increase the sampling frequency and applications in remote regions. The aim of this study was (1) to investigate the performance of an in-situ UV-Vis spectrophotometer for detecting spectral absorbances in comparison with a laboratory benchtop instrument; (2) to analyse the stability of DOC and Fe estimates from UV-Vis spectrophotometers among different rivers using multivariate methods; (3) to compare site-specific calibration of models to pooled models and investigate the extrapolation of DOC and Fe predictions from one catchment to another. This study indicates that absorbances that were measured by UV-Vis sensor explained 96% of the absorbance data from the laboratory benchtop instrument. Among the three tested multivariate methods, multiple stepwise regression (MSR) was the best model for both DOC and Fe predictions. Accurate and unbiased models for multiple watersheds for DOC were built successfully, and these models could be extrapolated from one watershed to another even without site-specific calibration for DOC. However, for Fe the combination of different datasets was not possible. |
| Databáze: | OpenAIRE |
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