A salt of nitrous acid
According to WebMD: Nitrites. Bacteria that cause a urinary tract infection (UTI) make an enzyme that changes urinary nitrates to nitrites. Nitrites in urine show a UTI is present.
Ammonia, nitrates, nitrites
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The process of converting ammonia into nitrates and nitrites is called nitrification. It is carried out by specific groups of bacteria in two steps: first, ammonia is oxidized to nitrites by ammonia-oxidizing bacteria, and then nitrites are further oxidized to nitrates by nitrite-oxidizing bacteria.
Nitrites in the urine are primarily associated with bacterial infections, particularly those caused by nitrate-reducing bacteria such as Escherichia coli. These bacteria convert nitrates, which are normally present in urine, into nitrites. The presence of nitrites is often used as an indicator in urinalysis to diagnose urinary tract infections (UTIs).
Nitrites in an aquarium typically take about 2-6 weeks to decrease to safe levels.
A nitrate is represented by -NO3 whereas a nitrite is represented by -NO2. So to answer your question, nitrates have 1 oxygen atom more than nitrites.
Nitrites and nitrates were nitrite (HNO2) and nitric acid (HNO3) the dianion, the two dianions are carcinogenic substances, it is generally with the two dianions are carcinogenic chemical hazards.
DNA
nitrates and nitrites
nitrites
Ammonia, nitrates, nitrites