
138
INTERFERENCES
Interference may be caused by the following ions: ferrous, ferric, cupric, mercurous, silver,
antimonious, bismuth, auric, lead, metavanadate and chloroplatinate. Strongly reducing and
oxidizing reagents.
High levels of nitrate (above 100 mg/L) could yield falsely high readings due to a minute amount
of reduction to nitrite that could occur at these levels.
NITRITE LOW RANGE