16
• At the end of measurement, the instrument directly displays concentration in mg/L of phosphate
on the LCD.
• To convert the reading to mg/L of phosphorus pentoxide (P
2
O
5
), multiply by a factor of 0.747.
• To convert the reading to mg/L of phosphorus (P) concentration, multiply by a factor of 0.326.
INTERFERENCES:
Interference may be caused by:
Iron above 50 mg/L
Silica above 50 mg/L
Silicate above 10 mg/L
Copper above 10 mg/L
Hydrogen sulfide, arsenate, turbid sample and highly buffered samples also interfere.
MEASUREMENT PROCEDURE