|Range||MDL||Method||Kit Catalog No.||Refill Catalog No.|
|1-15 & 10-300 ppm ethylene glycol (EG) (up to 30,000 ppm EG or 60,000 ppm propylene glycol w/A-0188 Accessory)||1 ppm||Purpald-Periodate||K-4815||R-4815|
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 kits are used to monitor potable waters for glycol contamination originating from glycol in cooling systems. They are also used to detect glycol in storm water effluent and airplane deicing operations and to monitor glycol recycling operations.
The Purpald-Periodate Method
References: Purpald® developed by Aldrich Chemical Company. Fritz, James S. and Schenk, George H., Quantitative Analytical Chemistry, 4th ed., p. 277 (1979).
In the colorimetric chemistry, periodic acid oxidizes ethylene glycol and/or propylene glycol to formaldehyde, which reacts with Purpald in alkaline solution. Test results are expressed as ppm (mg/L) ethylene glycol. To convert results to ppm propylene glycol, multiply by 2.
This test requires much less time to perform and involves fewer manipulations than the standard chromotropic acid procedure.
Shelf-life: five months. We recommend stocking quantities that will be used within four months.