1.1 Methods
Notes:
1. Interferences:
• Strong oxidizing and reducing substances interfere.
• Cupric and ferrous ions cause low results.
• Antimonous, Auric, Bismuth, Chloroplatinate, Ferric, Lead, Mercurous, Metavanadate,
Silver ions interfere by causing precipitation.
• In samples with very high concentrations of Nitrate (> 100 mg/L N) a small amount
of Nitrite will be found. Such high levels of Nitrate appear to undergo a slight amount
of reduction to Nitrite, either spontaneously or during the reaction time of the test.
2.
N
NO
2
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