Ammonium plays an important role in the nitrogen cycle in marine environments. There is no
universal method for ammonium analysis that can be applied to all types of seawater and …

Accurate methods and related robust analytical instruments for sensitive shipboard
determination of ammonium in coastal waters are highly desirable for both oceanographers …

This work describes the development of a sequential injection system for the ammonium
determination in transitional and coastal waters with a wide salinity range. Estuarine waters …

The determination of ammonium (NH4+) in concentrations ranging from nanomolar to
micromolar in fresh and brackish waters often loaded in high suspended particulate matter …

An improved method for the determination of ammonium in seawater was established using
purge-and-trap pretreatment coupled with flow injection fluorescence. An appropriate …

A selective and sensitive method has been developed for liquid chromatographic
determination of ammonium in water samples. The analyte is derivatized with Dansyl …

The determination of low-level ammonium in seawaters suffers from low sensitivity and high
contamination; therefore, it is desirable to develop highly sensitive methods for automatic …

Abstract Ammonium (NH 4+) and ammonia (NH 3) in aquatic ecosystems are of great
interest to environmental scientists because they can be used to study the nitrogen cycle …

Ammonia nitrogen, consisting of un-ionized ammonia and ammonium, is a key parameter for
studying the nitrogen cycle and indicating water quality. The measurement of these …

A selective and sensitive method based on the ammonium derivatisation with o-
phthaldialdehyde (OPA) and N-acetyl-cysteine (NAC) has been developed for ammonium …