Hanna Instruments HI 83225 User Manual

Page 40

Phosphorus LR

PHOSPHORUS LOW RANGE

SPECIFICATIONS

Range

0.0 to 10.0 mg/L

Resolution

0.1 mg/L

Accuracy

±0.5 mg/L ±4% of reading at 25 °C

Typical EMC Dev. ±0.1 mg/L
Light Source

Tungsten lamp with narrow band interference filter @ 525 nm

Method

Adaptation of the

Standard Methods for the Examination of Water and Wastewater,

edition, Amino Acid method. The reaction between phosphate and reagents

causes a blue tint in the sample.

REQUIRED REAGENTS

Code

Description

Quantity

HI 93706A-0

Molybdate

10 drops

HI 93706B-0

Amino Acid Powder

1 packet

REAGENT SETS

HI 93706-01 Reagents for 100 tests
HI 93706-03 Reagents for 300 tests
For other accessories see page 57.

MEASUREMENT PROCEDURE

Note: for sample preparation follow the IRRIGATION WATER (LR) procedure at page 20.
• Select the

Phosphorus method using the procedure described

in the

Method Selection section (see page 12).

• Fill the cuvette with 10 mL of unreacted sample (up to the

mark) and replace the cap.

• Place the cuvette into the holder and close the lid.

• Press the Zero key. The display will show “-0.0-” when the meter is zeroed and ready for

measurement.

• Remove the cuvette.

• Add 10 drops of HI 937O6A-0 Molybdate reagent.

10 mL