Visual Kits

Range	MDL	Method	Kit Catalog No.	Refill Catalog No.
1-15 ppm as ethylene glycol	1 ppm	Purpald-Periodate	K-4815	R-4815
1000-15,000 ppm as ethylene glycol	1000 ppm	Purpald-Periodate	K-4815C	R-4815C

Instrumental Kits

Range	Method	Kit Catalog No.
0.60-10.00 ppm as ethylene glycol	Purpald-Periodate	K-4403
5-65 ppm as propylene glycol	Purpald-Periodate	K-4423

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 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 to monitor glycol recycling operations.

 

In the colorimetric chemistry, periodic acid oxidizes ethylene glycol and/or propylene glycol to formaldehyde, which reacts with Purpald in alkaline solution. 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: five months. We recommend stocking quantities that will be used within four months.