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Phosphate Test Kits

Visual Kits

Range MDL Method Type Kit Cat. No. Refill
2 - 30 ppm 2 ppm Vanadomolybdophosphoric Acid CHEMets K-8530 R-8515
0 - 120 ppm 5 ppm Vanadomolybdophosphoric Acid CHEMets K-8515 R-8515
0.0 - 1.0 & 1 - 10 ppm 0.05 ppm Stannous Chloride CHEMets K-8510 R-8510
0 - 30 & 30 - 300 ppm 5 ppm Stannous Chloride VACUettes K-8510D R-8510D
0 - 60 & 60 - 600 ppm 10 ppm Stannous Chloride VACUettes K-8510A R-8510A
0 - 120 & 120 - 1,200 ppm 20 ppm Stannous Chloride VACUettes K-8510B R-8510B
0 - 1,200 & 1,200 - 12,000 ppm 200 ppm Stannous Chloride VACUettes K-8510C R-8510C

Instrumental Kits

Range Method Type Kit Cat. No.
0 - 8.00 ppm (0 - 5.00 ppm Spectrophotometer & V-3000) Stannous Chloride Vacu-vials K-8513
0 - 80.0ppm Vanadomolybdophosphoric Acid Vacu-vials K-8503

Note: Click on the ‘Kit Cat. No.’ to view the test instructions. Click on the ‘Range’ value for Vacu-vials to view accuracy chart.

CHEMetrics offers test kits employing the well-known Vanadomolybdophosphoric Acid and Stannous Chloride reagents to deliver sensitivity and accuracy within two minutes or less. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.

The Vanadomolybdophosphoric Acid Method

In test kits employing the vanadomolybdophosphoric acid method, phosphate reacts with ammonium molybdate under acid conditions and in the presence of vanadium to form a yellow-coloured product. Results are expressed as ppm (mg/l) PO4.

ASTM D 515-82, Phosphorous in Water, Test Method C.
APHA Standard Methods, 22nd ed., Method 4500-P C-1999.

The Stannous Chloride Method

Test kits employing this chemistry utilise a stannous chloride reduction. Phosphate reacts with ammonium molybdate and is then reduced by stannous chloride to form a blue complex. Results are expressed as ppm (mg/l) PO4.

To convert the PO4 test results to ppm Phosphate as P, simply multiply by 0.326. The V-2000 Multi Analyte Photometer has a choice of programs for the Phosphate test kit K-8513, both Phosphate as PO4 (0 - 8.00 ppm) and Phosphate as P (0 - 2.64 ppm). Please see page 5 of the V-2000 Operator’s Manual for further information.

APHA Standard Methods, 22nd ed., Method 4500-P D-1999.


Phosphorus occurs naturally in rock formations in the earth's crust, usually as phosphate. High phosphate concentrations in surface waters may indicate fertiliser runoff, domestic waste discharge, or the presence of industrial effluents or detergents. Although phosphates from these sources are usually poly-phosphates or organically bound, all will degrade to ortho or reactive phosphates with time.

Phosphate measurement is used to control scale and corrosion inhibitor levels in boilers and cooling towers. Both methods described above measure reactive phosphate, which will give a positive reaction prior to hydrolysis, and is usually termed ortho-phosphate.

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