68
METHOD PROCEDURES
68
68
PHOSPHA
TE LOW RANGE
• Insert the cuvette into the holder and close the lid.
• Press
Timer
and the display will show the countdown prior to the measurement or wait 3 minutes
and press
Read.
When the timer ends the meter will perform the reading. The instrument displays
concentration in
mg/L
of
phosphate (PO
4
3
¯).
• Press the
or
key to access the second level functions.
• Press
Chem Frm
to convert the result to
mg/L
of
phosphorus (P)
and
phosphorus pentoxide
(P
2
O
5
).
• Press the
or
key to return to the measurement screen.
INTERFERENCES
Interference may be caused by:
• Iron, Silica above 50 mg/L
• Copper, Silicate above 10 mg/L
• Arsenate, Highly buffered samples, Hydrogen sulfide, Turbid samples