Envco – Environmental Equipment

In the colorimetric chemistry, periodic acid oxidizes ethylene glycol and/or propyleneglycol 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.

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.

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.

Ordering Information:

Analyte: GLYCOL
Method: PERIODIC ACID/PURPALD METHOD.
Type: CHEMet

K-4815 Glycol 1-15 ppm
Test kits contain 30 ampoules, comparators, accessory solutions (when necessary), snap cup, MSDS, and instructions.

R-4815 Refill, 30 CHEMet ampoules
A-4400 Activator Solution, six 10 mL bottles
A-4401 Activator Solution, six 20 mL bottles
A-0013 Sample Cup, 25 mL, package of six
A-0014 Sample Cup Top, package of six
C-4815 Comparator, 1-15 ppm

Analyte: GLYCOL
Method: PERIODIC ACID/PURPALD METHOD.
Type: Vacuette

K-4815C Glycol 1000 - 15000 ppm
Test kits contain 30 ampoules, comparators, accessory solutions (when necessary), snap cup, MSDS, and instructions.

R-4815C Refill, 30 VACUette ampoules
A-4404 Activator Solution, six 10 mL bottles
A-4401 Activator Solution, six 20 mL bottles
A-0018 Dilutor Snapper Cup, 25 mL, package of six
A-0015 Micro-Test Tube, package of ten
C-4815C Comparator, 1,000-15,000 ppm