Chemetrics ampoules (orthophosphate - low range)

The Chemetric ampoules are designed to measure ortho-phosphate (PO₄) in water within two concentration ranges: 0–1 ppm (low range) and 1–10 ppm (high range). Ortho-phosphates react with ammonium molybdate under acidic conditions to form molybdophosphoric acid, which is then reduced by stannous chloride to create a blue color proportional to phosphate concentration.

How to test

• Fill the sample cup to 25 mL.
• Add 2 drops of S-8500 Activator Solution, then cap and shake to mix.
• Insert the CHEMet ampoule into the sample, snap the tip to fill, ensuring a bubble remains for mixing.
• Invert the ampoule several times to mix contents, then dry it.

After exactly 2 minutes, compare the ampoule’s color to a matching comparator:

• Use the low-range comparator for 0–1 ppm readings.
• Use the high-range comparator for 1–10 ppm readings.

If your reading falls between 2 shades of blue, record the median.