Abstract
Abstract. In this paper, we present a novel approach, enabling the measurement of nitrate concentrations in natural soil porewater containing natural soil dissolved organic carbon (DOC). The method is based on UV absorbance spectroscopy, combined with fluorescence spectroscopy, for simultaneous analysis of DOC and nitrate concentrations. The analytical procedure involves deduction of the absorption caused by the DOC from the total absorbance in the UV range that is attributed to both DOC and nitrate in the water solution. The analytical concept has been successfully tested in soil water samples obtained from five agricultural sites, as well as in water samples obtained from a commercial humus soil mixture. We believe that the new analytical concept can provide a scientific foundation for developing a sensor for real-time nitrate concentration measurements in agricultural soils. As such, it can play a significant role in reducing nitrate pollution in water resources, optimizing input application in agriculture, and decreasing food production costs.
Highlights
During the last half-century, clear trends of rising nitrate concentrations in groundwater have been observed in aquifers all around the globe (Jin et al, 2012; Kourakos et al, 2012; Liao et al, 2012)
The similarities between the trend line associated with the low dissolved organic carbon (DOC) levels and the trend line associated with the high DOC levels imply that the DOC contribution to the overall absorbance is consistent and quantifiable
In the framework of this research, we have developed a new concept that enables nitrate estimation in soil water using UV absorption spectroscopy
Summary
During the last half-century, clear trends of rising nitrate concentrations in groundwater have been observed in aquifers all around the globe (Jin et al, 2012; Kourakos et al, 2012; Liao et al, 2012). Nitrate-contaminated groundwater affects terrestrial water resources but marine ecosystems as well. Eutrophication and hypoxia on a large scale have been found in the Gulf of Mexico (Scavia et al, 2003) and the Black Sea (Tolmazin, 1985). They severely impact the Great Barrier Reef in Australia (Brodie et al, 2012). A global regulatory effort to reduce excess fertilizer application to prevent nitrate pollution has recently been undertaken worldwide by environmental protection and water authorities (Bureau, 2018; EPA US and Office of Water, 1994)
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