)
CHEMets Glycol Visual Method
Home » CHEMets Glycol Visual Method
CHEMets Glycol 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: Purpald developed by Aldrich Chemical Company.
Ethylene glycol and propylene glycol are the primary ingredients in commercially-available antifreezes. They are used with various corrosion inhibitors to protect metal surfaces in cooling water systems. CHEMetrics glycol test kits, which employ a chemistry perfected by CHEMetrics, are used to monitor potable waters for contamination from glycol originating in cooling systems.
Stricter limits for stormwater effluent glycol discharges are expected from the USEPA. In addition to the glycol recycling operations, monitoring the efficiency of recovery and collection systems is crucial.
In the colorimetric chemistry, periodic acid oxidizes ethylene glycol and/or propylene glycol to formaldehyde, which reacts with Purpald in alkaline solution.
Visual and instrumental test kits are available that report test results in either ppm (mg/L) ethylene or propylene glycol. Correction factors are supplied with all kits to convert test results to the alternate glycol form.
This test requires much less time to perform and involves fewer manipulations than the standard chromotropic acid procedure.
Shelf-life: six months. We recommend stocking quantities that will be used within five months. Refrigeration will dramatically increase the shelf-life of these products.
Visual Kits
Range: 1-15 ppm as ethylene glycol
MDL: 1 ppm / Method: Purpald-Periodate
Cat# CHEMets Kit K-4815
CHEMets Refill, 30 ampoules, Shelf-life 6 months R-48152
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-44001
Activator Solution Pack, six 20 mL bottles A-44011,3
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-44021
Comparator, Shelf-life 2 years: 1, 2, 3, 4, 5, 6, 8, 10, 15 ppm C-4815
Kit comes in a plastic case and contains everything needed to perform 30 tests (except distilled water): Refill, Comparator, Activator Solutions, 25 mL sample cup, sample cup top, instructions, and MSDS.