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PHOSPHORUS, REACTIVE HIGH RANGE
Phosphorus, Reactive HR
SPECIFICATIONS
Range 0.0 to 32.6 mg/L P
Resolution 0.1 mg/L
Accuracy ±0.5 mg/L or ±5 % of reading @ 25 °C, whichever is greater
Light Source Tungsten lamp with narrow band interference filter @ 420 nm
Method Adaptation of the
Standard Methods for the Examination of Water and Wastewater,
20
th
edition
, 4500-P C, vanadomolybdophosphoric acid method. The reaction between
orthophosphate and the reagents causes a yellow tint in the sample.
REQUIRED REAGENTS
Code Description Q.ty/test Q.ty/set
HI 93763A-0* Reagent Vial 1 vial 50 vials
DEIONIZED120 Deionized Water 5 mL 1 bottle
*
Reagent Vial identification
: P RHR, green label.
Note: Store the unused vials in their container in a cool and dark place.
REAGENT SET
HI 93763A-50 Reagents for up to 49 tests
For other accessories see page 68.
MEASUREMENT PROCEDURE
Reagent Blank Correction: This method requires a reagent blank correction. A single blank vial may be used
more than once; the blank vial is stable up to two weeks (room temperature). For most accurate measurement,
run a blank for each set of measurements and always use the same lot of reagents for blank and samples.
• Select the
Phosphorus, Reactive High Range
method following one of the procedures described in the
“Method Selection” section (see page 15).
• Remove the caps from two Reagent Vials.
• Add exactly 5.0 mL of sample to one vial (sample vial), and 5.0 mL of deionized water to the other
vial (blank vial), while keeping the vials at a 45-degree angle.
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