Molybdate Test Kits
|Range||MDL||Method||Type||Kit Cat. No.||Refill Cat. No.|
|0 - 7 ppm as Mo||0.5 ppm||Catechol||CHEMets||K-6701||R-6702|
|2 - 24 ppm as Mo||2 ppm||Catechol||CHEMets||K-6702||R-6702|
|20 - 200 ppm as Mo||20 ppm||Catechol||CHEMets||K-6720||R-6720|
|Range||Method||Type||Kit Cat. No.|
|0 - 25.0 ppm as Mo||Catechol||Vacu-vials||K-6703|
CHEMetrics offers test kits employing the well-known Catechol reagent 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 Catechol Method
The molybdate test method employs the 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).
G. P. Haight and V. Paragamian, Analytical Chemistry, pp. 32, 642 (1960).
H. Onishi and E. B. Sandell, Photometric Determination of Trace Metals, 4th ed., Part 1, p. 295 (1978).
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 oxidised 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.