49
SPECIFICATIONS
Range 0.00 to 1.60 mg/L P
Resolution 0.01 mg/L
Accuracy ±0.05 mg/L or ±5 % of reading @ 25 °C, whichever is greater
Light Source Tungsten lamp with narrow band interference filter @ 610 nm
Method Adaptation of the EPA method 365.2 and
Standard Methods for the Examination of
Water and Wastewater, 20
th
edition
, 4500-P E, ascorbic acid method. The reaction
between orthophosphate and the reagent causes a blue tint in the sample.
REQUIRED REAGENTS
Code Description Q.ty/test Q.ty/set
HI 93758A-0* Reagent Vial 1 vial 50 vials
HI 93758-0 Phosphorus Reagent 1 packet 50 packets
*
Reagent Vial identification
: P R, red label.
REAGENT SET
HI 93758A-50 Reagents for 50 tests
For other accessories see page 68.
MEASUREMENT PROCEDURE
• Select the
Phosphorus,
Reactive
method following one of the procedures described in the “Method
Selection” section (see page 15).
• Remove the cap from a Reagent Vial.
• Add exactly 5.0 mL of sample to the vial, while keeping the
vial at a 45-degree angle.
• Replace the cap and mix by inverting the vial a couple of
times. This is the blank.
• Place the vial into the holder and push it completely down.
• Press the Zero key. The instrument will perform a zero sequence
and after a few seconds the display will show “-0.0-”. Now the
meter is zeroed and ready for measurement.
• Remove the vial.
PHOSPHORUS, REACTIVE
Phosphorus, Reactive
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