Hanna Instruments HI 83212 - Manual (Page 21)

40 41 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 the ▲ or ▼ to access the second level of functions.
• Press the Chem Frm functional key to convert the result in mg/L of phosphate (PO
4
3- ) and phosphorus
pentoxide (P
2
O
5
).
• Press the ▲ or ▼ to go back 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
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 50.
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. x 10
10 ml