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8.18. PHOSPHATE, MARINE ULTRA LOW RANGE
SPECIFICATIONS
Range 0 to 200 µg/L (as P)
Resolution 1 µg/L
Accuracy ±5 µg/L ±5% of reading at 25 °C
Light Source LED with narrow band interference filter @ 610 nm
Method Adaptation of the Standard Methods for the Examination of Water and
Wastewater, 20th edition, Ascorbic Acid method.
REQUIRED REAGENTS
Code Description Quantity
HI736‑25 Phosphorus Ultra Low Range Reagent 1 packet
REAGENT SETS
HI736‑25 Reagents for 25 tests
For other accessories see page 87.
MEASUREMENT PROCEDURE
• Select the Phosphate Marine ULR method using the procedure described in the Method Selection
section (see page 17).
• Rinse, cap and shake the cuvette several times with
unreacted sample.
• Fill the cuvette with 10 mL of 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.
• Add one packet of HI736‑25 Phosphorus Ultra Low
Range Reagent. Replace the cap and shake gently
(for about 2 minutes) until the powder is completely
dissolved.
10 mL
PHOSPHATE, MARINE ULTRA LOW RANGE
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