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Nitrat‐Bestimmung in Oberflächengewässern als Beispiel der Anwendung der UV‐Derivativspektroskopie in der Umweltanalytik

1987; Wiley; Volume: 15; Issue: 5 Linguagem: Inglês

10.1002/aheh.19870150504

1521-401X

Klaus‐Michael Wollin,

Pharmaceutical and Antibiotic Environmental Impacts

Abstract Artificial nitrate solutions and a large number of membranefiltered nitrate‐containing water samples from Mecklenburgian lakes and rivers were investigated in the spectral range of 200… 260 nm with a dual beam spectrophotometer. By the formation of derivative spectra there are achieved a higher spectral resolution and the elimination of undesired disturbing effects since first‐ and higher‐order derivatives are formed. As it is known, the direct spectrophotometric nitrate determination is influenced by organic substances and some inorganic ions of natural waters. As a result, the UV derivative spectroscopy of 2nd order is recommended as a suitable technique of nitrate analysis for surface waters with a high degree of accuracy and precision – detailed reports on investigations being given. Compared with the equivalent salicylate method, however, the expenditure of the UV derivative spectroscopy described is considerably lower.