User Manual

106 107
Phosphorus
Add the content of one packet of HI 93706B-0 Phosphorus
Reagent B (Amino Acid) to the cuvette. Replace the cap
and shake gently until completely dissolved.
Reinsert the cuvette into the instrument.
Press Timer and the display will show the countdown prior to the measurement or, alternatively,
wait for 5 minutes and press Read. When the timer ends the meter will perform the reading. The
instrument displays the results in mg/L of phosphorus (P).
Press s or t to access the second level functions.
Press the Chem Frm key to convert the result in mg/L of phosphate (PO
4
3
¯) and phosphorus pentoxide
(P
2
O
5
).
Press s or t to return to the measurement screen.
INTERFERENCES
Interference may be caused by:
Sulfide
Chloride above 150000 mg/L
Calcium above 10000 mg/L as CaCO
3
Magnesium above 40000 mg/L as CaCO
3
Ferrous iron above 100 mg/L
Phosphorus
PHOSPHORUS
SPECIFICATIONS
Range 0.0 to 15.0 mg/L
Resolution 0.1 mg/L
Accuracy ±0.3 mg/L ±4% of reading at 25 °C
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,
18
th
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 128.
MEASUREMENT PROCEDURE
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