Envco – Environmental Equipment

The DDPD chemistry employs a methyl-substituted form of the DPD reagent. The A-7400 activator solution (potassium iodide) is added to the sample before analysis. Ozone reacts with the iodide to liberate iodine. The iodine then reacts with the reagent to give a purple color.

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.

Various free halogens and halogenating agents produce color with the reagent. Chromate in samples below 25 ppm will not interfere with results. Results are expressed as ppm (mg/L) O3.

Ordering Information

Analyte: OZONE
Method: DDPDtm METHOD (Proprietary chemistry).
Type: CHEMet

K-7402 Ozone 0-0.6 and 0.6-2.0 ppm

Test kits contain 30 ampoules, comparators, accessory solutions (when necessary), snap cup, MSDS, and instructions.

R-7402 Refill, 30 CHEMet ampoules
A-7400 Activator Solution, six 10 mL bottles
A-0013 Sample Cup, 25 mL, package of six
C-7401 Comparator, 0-0.6 ppm
C-7402 Comparator, 0.6-2 ppm