Multi-isotope approach for the identification and characterisation of nitrate pollution sources in the Marano lagoon (Italy) and parts of its catchment area

作者：Saccon P^*; Leis A; Marca A; Kaiser J; Campisi L; Boettcher M E; Savarino J; Escher P; Eisenhauer A; Erbland J

来源：Applied Geochemistry, 2013, 34: 75-89.

DOI：10.1016/j.apgeochem.2013.02.007

A multi-isotope approach has been used in the Marano lagoon (NE Italy) and parts of its catchment area to identify causes of increased NO3- pollution. The hydrogeochemical features of different water types and potential sources of NO3- were characterized using the isotopic composition of NO3- (delta N-15, delta O-18, and Delta O-17) and other source-related species such as B (delta B-11), water (delta H-2 and delta O-18) and SO42- (delta S-34 and delta O-18). Water samples from the lagoon, its tributary rivers, the groundwater up-welling line, groundwater, sewer pipes, and open sea water have been collected at quarterly intervals in the years 2009-2010. The results indicate that the NO3- load in the lagoon was not only derived from agricultural activities but also from other sources such as urban waste water, in situ nitrification and atmospheric deposition. The delta S-34 signature in the lagoon clearly denotes the largely prevailing origin of aqueous SO42- from seawater, and practically points to the absence of any appreciable redox process involving S species in the lagoon. It also supports the existence of a connection between the lagoon and the nearby Tagliamento river.

• 出版日期2013-7