K-8503 Phosphate

K-8503 Phosphate Vacu-vials Kit was designed to obtain Phosphate levels from 0-80.0 ppm

Phosphate Information

This kit requires the use of a CHEMetrics Direct-Readout Photometer or a spectrophotometer capable of accepting a 13 mm diameter round cell. Instrument sold separately.


Why Choose Vacu-vials?

CHEMetrics Vacu-vials self-filling ampoules are a great way to test for dissolved substances in liquid. Unlike our visual test kits, the Vacu-vials test kit allows you to obtain an instrumental result using the CHEMetrics Direct-Redout Photometers or any spectrophotometer capable of accepting a 13m diameter round cell. When using equipment from another manufacturer, set the spectrophotometer to absorbance mode, select the wavelength specified by the Vacu-vials kit instructions, and follow the test procedure. The K-8503 Phosphate Kit was designed to accurately measure the levels of Phosphate in water from 0-80.0 ppm.

Safe and Reliable Results

While traditional methods often require multiple steps and thorough preparation, these test kits allow you to obtain dependable results with a few simple steps. By simplifying the testing method, Vacuvials test kits reduce the potential for operator error. Additionally, each of the ampoules contained in the test kits is vacuum sealed which helps eliminate the problem of obtaining inaccurate results from stale or unstable reagents. These reagents are stored right in the tip of each ampoule and sealed in glass, thereby minimizing direct contact with the chemicals.

What's included:

  • 30 self-filling Ampoules
  • 25 mL Sample Cup
  • Ampoule Blank
  • Instruction Manual


K-8503 uses 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-colored product. Results are expressed as ppm (mg/L) PO4.

Phosphorus occurs naturally in rock formations in the earth's crust, usually as phosphate. High phosphate concentrations in surface waters may indicate fertilizer 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 below measure reactive phosphate, which will give a positive reaction prior to hydrolysis, and is usually termed ortho-phosphate. 

How to use:

1. Fill the sample cup to the 25 mL mark with the sample to be tested. 2. Place the Vacu-vial ampoule tip-first into the sample cup. Snap the tip and the ampoule will automatically fill.
3.To mix the ampoule, tilt it from side to side, allowing the bubble to travel from end to end. 4. Dry the ampoule
5. Wait 5 minutes for color development. 6. Insert the Vacu-vial ampoule into the photometer, flat end first, and obtain a reading in ppm.



More CHEMetrics Kits for Phosphate

Product Number Method   Range Price
K8513 Stannous Chloride   0-8.00 ppm or 0-5.00 ppm (depending on reader) $30.00
Chemets Kits
Product Number Method MDS Range Price
K8510 Stannous Chloride 0.05 ppm 0-1 & 1-10 ppm $66.00
K8530 Vanadomolybdophosphoric Acid 2 ppm 2-30 ppm $47.00
K8515 Vanadomolybdophosphoric Acid 5 ppm 0-120 ppm $56.00
Product Number Method MDS Range Price
K8510D Stannous Chloride 5 ppm 0-50 & 60-600ppm $71.00
K8510A Stannous Chloride 10 ppm 0-120 & 120-1200ppm $71.00
K8510B Stannous Chloride 20 ppm 0-1000 & 1000-10,000ppm $71.00
K8510C Stannous Chloride 200 ppm 0-30 & 30-300ppm  $72.00



K-8503 Instructions

Phosphate Tech Sheet

Phosphate Information

More Information
Manufacturer CHEMetrics
Call For Price No
Gas Phosphate
4-20 mA Output No
Voltage Output None
Power Requirements 4 AAA Batteries
Datalogging No
Warranty 1 Year
Method Vanadomolybdophosphoric Acid
Range 0-80.o ppm
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