1. Evaluation of gases via Method E UL Jeff Hebenstreit 12/02/2009

2. Background Utility contacted UL Concern surrounding contaminants in chlorine Provided a study suggesting a concentration effect of Carbon Tetrachloride.

3. Concerns A product could meet the requirements of the standard, if prepared from a full cylinder, where it truly may be non-compliant. As product is used, compliant products can become non-compliant, depending on the application method.

4. Modified Test Method Gases prepped via method E Prepared sample from full cylinder Vented cylinder to near empty Prepared a second sample Analyzed via EPA method 524.2

5. Results

7. AWWA B301-04 Section 4.3, Impurities – Liquid chlorine: a. Moisture ≤ 150 ppm b. Heavy Metals, sum of all ≤ 30 ppm c. Lead ≤ 10 ppm d. Mercury ≤ 1 ppm e. Arsenic ≤ 3 ppm f. Nonvolatile residue ≤ 50 ppm mfrd rail/tank cars or ≤ 150 ppm cylinders g. Carbon tetrachloride ≤ 100 ppm h. Trihalomethanes ≤ 300 ppm

8. Examples

9. Recommendation Formation of a Task Group Reach out to AWWA