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CHEMets Molybdate Visual Method
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CHEMets Molybdate Visual Method
The CHEMets Method To perform a test, immerse the CHEMet ampoule into the sample and snap off the tip (Step 1)- the correct volume of sample is automatically drawn in, filling the ampoule; a small inert gas bubble remains in the ampoule. To facilitate mixing the sample and reagent, tilt the ampoule back and forth so the bubble travels from end to end (Step 2). In 2 minutes or less, quantify the result by comparing the filled ampoule to the appropriate color standard(s) (Step 3). For higher concentrations, the flat comparator is used. For lower concentrations, the round comparator is used. The ampoule is compared with the standards until a color match is found. Kits include 30 ampoules, comparator(s), accessory solution(s)(when necessary), a sample cup, and instructions. Refill packs of 30 ampoules and accessory solutions are available separately. Comparators have a 2-year shelflife. Material Safety Data Sheets are provided in test kits. CHEMets ampoules are designed for maximum simplicity and accuracy. Each glass ampoule is 7 mm in diameter, 100 mm in length, with a tapered, pre-scored tip; reagents are vacuum-sealed inside.
Product Description
Method
References: 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 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.
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).
Visual Kits
Range: 0-7 ppm as Mo
MDL: 0.5 ppm / Method: Catechol
Cat# CHEMets Kit K-6701
CHEMets Refill, 30 ampoules R-6702
Comparator, Shelf-life 2 years: 0, 1, 2, 3, 4, 5, 6, 7 ppm C-6701
Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Comparator, 25 mL sample cup, instructions, and MSDS.
Range: 2-24 ppm as Mo
MDL: 2 ppm / Method: Catechol
Cat# CHEMets Kit K-6702
CHEMets Refill, 30 ampoules R-6702
Comparator, Shelf-life 2 years: 2, 4, 6, 8, 10, 12, 16, 20, 24 ppm C-6702
Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Comparator, 25 mL sample cup, instructions, and MSDS.
Range: 20-200 ppm as Mo
MDL: 20 ppm / Method: Catechol
Cat# CHEMets Kit K-6720
CHEMets Refill, 30 ampoules R-6720
Comparator, Shelf-life 2 years: 20, 40, 60, 80, 100, 120, 140, 160, 200 ppm C-6720
Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Comparator, 25 mL sample cup, instructions, and MSDS.