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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 - PowerPoint PPT Presentation
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Chair - Jeff Hebenstreit - UL12/4/2013
BackgroundPrevious presentation – Evaluation of gases to
Method E12/2/2009
Background• Utility contacted UL• Concern surrounding contaminants in chlorine• Provided a study suggesting a concentration
effect of Carbon Tetrachloride.
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.
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
Results
Sample 1 – Manufacturer A Normalized Result (g/L)
Detected VOC Prior to venting After venting, approx. 15% of original Cl2 weight
SPAC (g/L)
Chloroform 0.041 0.14 8.0
Results
Sample 1 – Manufacturer B Normalized Result (g/L)
Detected VOC 86% capacity 9% capacity SPAC (g/L)
Acetone ND 0.43 600 Carbon tetrachloride 0.36 2.83 0.5 Trichlorofluoromethane ND 0.035 200 Sample 2 – Manufacturer B
Normalized Result (g/L) Detected VOC 86% capacity 9% capacity
SPAC (g/L)
Carbon tetrachloride ND 0.02 0.5 Trichlorofluoromethane ND 0.008 200 Vinyl chloride ND 0.008 0.2
AWWA B301-04Section 4.3, Impurities – Liquid chlorine:a. Moisture ≤ 150 ppmb. Heavy Metals, sum of all ≤ 30 ppmc. Lead ≤ 10 ppmd. Mercury ≤ 1 ppme. Arsenic ≤ 3 ppmf. Nonvolatile residue ≤ 50 ppm mfrd rail/tank cars
or ≤ 150 ppm cylindersg. Carbon tetrachloride ≤ 100 ppmh. Trihalomethanes ≤ 300 ppm
Examples
CCl4 in Cl Gas (%)
CCl4 (ppm)
Dose Rate Cl (mg/L water)
Approx CCl4 in H20 (ug/L)
SPAC/NSF 60 & CA MCL (ug/L)
0.01 100 2 0.2 0.5
0.01 100 5 0.5 0.5 0.01 100 10 1 0.5
0.005 50 2 0.1 0.5
0.005 50 5 0.25 0.5 0.005 50 10 0.5 0.5
RecommendationFormation of a Task GroupReach out to AWWA
Task Group Actions• Discussed Sampling Procedures (no change)• Issue paper for pre-filling requirements• Proposed Modification AWWA B304• Proposed language for AWWA M20 Manual
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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
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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).
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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
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Task Group Complete• Thanks for all the task group participants
• Roster members• Other participants
• Recommend closure of this Task Group
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