K-6702 Molybdate

K-6702 Molybdate Kit was designed to obtain molybdate levels from 2-24 ppm

Replacement ampoules for the K-6702 Test Kit can be found here.

Molybdate Information


Why Choose CHEMetrics Chemets kits?

CHEMetrics Chemets self-filing reagent ampoules are a great way to test for dissolved substances in liquids. These visual test kits allow you to obtain results by measuring the color of the sample according to the color comparators provided with the kit. This unique method allows you to attain results quickly and accurately with minimal contact with potentially hazardous materials.

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, Chemets 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
  • low and high-range comparators 
  • 1 25 mL Sample Cup
  • Stabilizer Solutions
  • 1 mL syringe
  • Instruction Manual


The K-6702 Molybdate Kit was designed to accurately measure the levels of molybdate in water from 2-24 ppm. K-6702 uses the Catechol Method. The molybdate test method employs catechol chemistry. In a mildly reducing alkaline solution, catechol reacts with hexavalent molybdenum to form a yellow-orange colored chelate in direct proportion to the hexavalent molybdenum concentration. Test results are expressed in ppm (mg/L) molybdenum (Mo). 

Molybdate is used throughout the industrial water treatment and power generation industries as a corrosion inhibitor in both open- and closed-loop cooling water systems. In solution, molybdate anions complex with oxidized iron to form a protective film of molybdate and ferric-oxide. Molybdate is considered an effective, environmentally acceptable alternative to chromate treatment. Unlike many other transition elements, molybdenum exhibits low or even negligible toxicity. 

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 and wait 1 minute for color development.
5. Place the ampoule into the center of the round comparator and hold it toward a source of light, viewing from the bottom. Rotate the comparator until the color below the ampoule shows the closest match. 6. For higher concentrations, use flat comparator. Place the ampoule between the color standards, moving it along the comparator until you can determine the closest match.

For more detailed instructions, see the link at the bottom of the page.


WARNING! This product can expose you to chemicals including catechol, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.

More CHEMetrics Kits for Molybdate

Product Number Method   Range Price
K6703 Catechol   0-25.0 ppm as Mo $32.00
Chemets Kits
Product Number Method MDS Range Price
K6701 Catechol 0.5 ppm 0-7 ppm as Mo $47.00
K6702 Catechol 2 ppm 2-24 ppm as Mo $56.00
K6720 Catechol 20 ppm 20-200 ppm as Mo $56.00


Molybdate Instructions

Safety Data Sheet

Catechol Tech Sheet

Molybdate Information

More Information
Manufacturer CHEMetrics
Call For Price No
Gas Molybdate
4-20 mA Output No
Voltage Output None
Power Requirements 4 AAA Batteries
Datalogging No
Warranty 1 Year
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