Nitrate is traditionally measured via colorimetric techniques employing a Copper-Cadmium reduction column. This technique though sensitive is cumbersome and tedious.  Analysis by nitrate ion selective electrode (ISE) coupled with flow injection analysis coupled with flow injection analysis can provide a rapid and automatable procedure for nitrate determination. Unfortunately chloride ions interfere significantly with the nitrate ISE prohibiting its use in seawater and salt-water aquaria. Precipitation of chloride as insoluble silver chloride has been used to remove chloride ions from solution enabling the use of the nitrate electrode in brackish water samples. This approach is very expensive. This work reports the investigation of transition metal ions capable of complexing chloride as a means to eliminate chloride interference when using the nitrate I.S.E. in Flow Injection Analysis (FIA) systems.

Investigation of the use of transition metal ions to remove chloride interference from nitrate ISEs

249th National Meeting (2015)

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