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Carbon Tetrachloride Task Group

Carbon Tetrachloride Task Group. Chair - Jeff Hebenstreit - UL 12/4/2013. Background. Previous presentation – Evaluation of gases to Method E 12/2/2009 Background Utility contacted UL Concern surrounding contaminants in chlorine

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Carbon Tetrachloride Task Group

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  1. Carbon Tetrachloride Task Group Chair - Jeff Hebenstreit - UL 12/4/2013

  2. Background • Previous presentation – Evaluation of gases to Method E • 12/2/2009 • 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

  6. 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

  10. Task Group Actions • Discussed Sampling Procedures (no change) • Issue paper for pre-filling requirements • Proposed Modification AWWA B304 • Proposed language for AWWA M20 Manual

  11. Pre-filling Requirements • Add 6.3.4 – Chlorine Container and Rail Car Pre-Filling Requirements • Requires any remaining liquids to be removed prior to filling • Certifiers can audit against these requirements if added to NSF 60 • Motion for this to go to ballot

  12. Proposed Changes to AWWA B301 • Ballot proposal submitted to AWWA disinfection committee to revise AWWA B301 for the following: • Carbon Tetrachloride: Revise from the current limit of 100 ppm to 16 ppm. • Trihalomethanes: Revise from the current limit of 300 ppm to 267 ppm (0.0267 percent).

  13. AWWA M20 Manual • Proposed language to warn about the issue • Also indicated that the use of vaporizers do not necessarily remedy the issue • Suggested a remedy if issue is present

  14. Task Group Complete • Thanks for all the task group participants • Roster members • Other participants • Recommend closure of this Task Group

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