How would I test for nitrates in water?

Some recent nitrates Tip on Aquaponic:
Question by Preeti: How would I test for nitrates in water?
I am comparing tap water and bottled water for an experiment for school and I wanted to conduct an experiment that tested for nitrates, but I dont genuinely know exactly where to start. If anyone could just give me a starting point or a rough overview of a process that could potentially perform that would be fantastic!!

Thanks so considerably, your assist would be tremendously appreciated!


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