Development of methods for fast sample selective determination of nitrate by ion selective electrodes. Development of automated methods for spectrophotometric, fluorometric and potentiometric determinations of nitrogen-containing compounds

Nitrate electrodes, based on a thorough research aimed at synthesizing a series of electroactive materials of optimum characteristics for use in PVC-based (polyvinylchloride) membrane electrodes, have been constructed and used in the Flow Injection Analysis System. Spectrophotometric procedures for determination of nitrate, nitrite, ammonia and total nitrogen in soils, plants, fertilizers, and waste waters by means of the Flow Injection Analysis Technique have been devised. The analytical procedures have all been tested on routine analyses of different samples, and good agreement between the results obtained with new techniques and conventional procedures have been found