Hanna Instruments HI 83208-2008 User Manual

Page 31

Phosphorus

PHOSPHORUS

SPECIFICATIONS

Range

0.0 to 15.0 mg/L

Resolution

0.1 mg/L

Accuracy

±0.3 mg/L ±4% of reading

Typical EMC Dev. ±0.2 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 73.

MEASUREMENT PROCEDURE

• Select the

Phosphorus method using the procedure de-

scribed 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 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

x 10

Phosphate LR

• Reinsert the cuvette into the instrument.

• Press TIMER and the display will show the countdown prior to the

measurement or, alternatively, wait for 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

• Press the or to access the second level of functions.
• Press the Chem Frm functional key to convert the result in mg/L of phosphorus (P) and phosphorus

pentoxide (P

• Press the or to go back to the measurement screen.

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.