Final answer:
Titration with EDTA is used to measure nitrates in water. Colorimetry and spectroscopic methods are important techniques in chemical analysis.
Explanation:
The method used to measure the presence of nitrates in water is Titration with EDTA. This method involves adding a titrant solution containing EDTA (ethylenediaminetetraacetic acid) to the water sample until the endpoint is reached, indicated by a color change.
Colorimetry is a technique commonly used in chemical analysis, where the amount of a substance is determined by measuring the absorbance of visible light by a colored product formed in a reaction.
Spectroscopic methods involve analyzing the interaction between electromagnetic radiation and matter to determine the concentration of substances in a sample, as seen in Nessler's method for ammonia determination.
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