Abstract
A colorimetric method was developed for the determination of trace nitrates in solutions containing up to 50 g 1−1 of sodium chloride. Beer's law applies, in such solutions for concentrations of up to 1 mg of NaNO3 per liter. Effects of sodium chloride concentration and time on the development of color were quantitatively evaluated with an overall error of about 4%. Temperature effects on solutions analyzed were found to be a major cause of inconsistencies in this otherwise satisfactory method.
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