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A direct automated method for routine determination of ammonia in sea and estuarine waters has been developed using segmented flow analysis. The method, based on the reaction of ammonia with orthophtaldialdehyde (OPA) and sulfite, is easy to use, sensitive and highly reproducible. The combination of reagents makes it highly selective, thus eliminating the need for the gas diffusion cell commonly used...
In most estuaries, a linear relationship between fluorescence intensity and salinity has been frequently reported. Accordingly, it is commonly accepted that the dissolved organic matter in an estuary is essentially conservative and is not substantially modified by dilution with sea water. In this paper we have tried to verify whether other fluorescent parameters, namely the position of the fluorescence...
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