Automated Colorimetric Method for Nitrate Analysis
Several methods exist for determining nitrate in aqueous solutions. However, the most commonly performed USEPA-approved methods are problematic and can be unreliable. USEPA methods 353.1 nitrate Hydrazine Reduction1,2 and 353.2 nitrate Cadmium Reduction3 utilize chemicals that are carcinogenic and highly toxic. Hazardous waste is generated when performing these methods and disposal is costly. Other methods performed by ion chromatography (IC)4,5 and ion selective electrode (ISE)6 are slow and can have issues when performing analysis on samples with high ionic strength, such as wastewater, ground water and soil extracts. The new Systea Easy (1 – Reagent) nitrate method was developed to eliminate the problems associated with these traditional methods and improve performance.