Phosphate (reactive, ortho)
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Methods
Visual Kits
Phosphorus occurs naturally in rock formations in the Range: 0-1 & 1-10 ppm
earth’s crust, usually as phosphate. High phosphate
MDL: 0.05 ppm / Method: Stannous Chloride
concentrations in surface waters may indicate fertilizer
Cat#
runoff, domestic waste discharge, or the presence of
CHEMets Kit K-8510
industrial effluents or detergents. Although phosphates
CHEMets Refill, 30 ampoules R-8510
from these sources are usually poly-phosphates or
Activator Solution Pack, six 10 mL bottles, Shelf-life 20 months A-8500
1
organically bound, all will degrade to ortho or reactive
Low Range Comparator, Shelf-life 2 years:
0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0 ppm C-8501
phosphates with time.
High Range Comparator, Shelf-life 2 years:
Phosphate measurement is used to control scale
1, 2, 3, 4, 5, 6, 7, 8, 10 ppm C-8510
and corrosion inhibitor levels in boilers and cooling
Kit comes in a plastic case and contains everything needed to perform 30
tests: Refill, Low and High Range Comparators, Activator Solution, 25 mL
towers. Both methods described below measure reactive
sample cup, sample cup top, instructions, and MSDS.
phosphate, which will give a positive reaction prior to
hydrolysis, and is usually termed ortho-phosphate.
Range: 2-30 ppm
MDL: 2 ppm / Method: Vanadomolybdophosphoric Acid
The Vanadomolybdophosphoric Acid Method
Cat#
References: ASTM D 515-82, Phosphorous in Water,
CHEMets Kit K-8530
Test Method C. APHA Standard Methods, 20
th
ed., pp.
CHEMets Refill, 30 ampoules R-8515
4-144, Method 4500-P C (1998).
Comparator, Shelf-life 2 years:
2, 4, 6, 8, 10, 15, 20, 30 ppm C-8530
In test kits employing the vanadomolybdophosphoric
Kit comes in a plastic case and contains everything needed to perform 30 tests:
acid method, phosphate reacts with ammonium
Refill, Comparator, 25 mL sample cup, instructions, and MSDS.
molybdate under acid conditions and in the presence
of vanadium to form a yellow-colored product. Results
Range: 10-150 ppm
are expressed as ppm (mg/L) PO
MDL: 10 ppm / Method: Vanadomolybdophosphoric Acid
4
.
Cat#
The Stannous Chloride Method
CHEMets Kit K-8515
CHEMets Refill, 30 ampoules R-8515
References: APHA Standard Methods, 20
th
ed., pp. 4-
Comparator, Shelf-life 2 years:
145, Method 4500-P D (1998).
10, 20, 30, 40, 60, 80, 100, 120, 150 ppm C-8515
Test kits employing this chemistry utilize a stannous Kit comes in a plastic case and contains everything needed to perform 30 tests:
chloride reduction. Phosphate reacts with ammonium
Refill, Comparator, 25 mL sample cup, instructions, and MSDS.
molybdate and is then reduced by stannous chloride to
If no shelf-life is listed for a product, then the shelf-life is at least 2 years.
form a blue complex. Results are expressed as ppm
(mg/L) PO
4
.
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