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Testing for Nitrosamines in Sulfur Cured Elastomers Drinking Water Additives Joint Committee Clifton Mclellan December 1 st 2011.

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Presentation on theme: "Testing for Nitrosamines in Sulfur Cured Elastomers Drinking Water Additives Joint Committee Clifton Mclellan December 1 st 2011."— Presentation transcript:

1 Testing for Nitrosamines in Sulfur Cured Elastomers Drinking Water Additives Joint Committee Clifton Mclellan December 1 st 2011

2 Issue Statement Nitrosamines can form during the manufacture of sulfur cured elastomeric materials resulting in release to drinking water from the joining and sealing products produced from them. To address this potential, the minimum battery of analysis for these materials in Table 3.1 should be updated to require nitrosamine analysis.

3 Standard 61 Minimum test battery requirements –Characterization of the product or material Determination of the specific section under which product will be evaluated Identification of all water contact materials and corresponding surface areas Complete formulation information –Conditions of use Including volume and temperature Material specific analysis High water solubility Probability of extraction Known or suspected toxicity of a substance or its byproducts

4 Rubber Manufacturing Amines react with Nitrogen oxide compounds to form Nitrosamines –Sources of NO include reinforcing agents, absorption onto fillers, and direct addition –Secondary amines react to form the most stable Nitrosamine compounds Accelerators used in vulcanization and curing are major sources of secondary amine compounds and their resulting Nitrosamines –Dithiocarbamates –Sulfenamides –Thiurams Alternatives –Inhibitors –Compounding with non-Nitrosamine generating accelerators

5 Nitrosamines in Drinking Water CompoundTAC (ppb) SPAC (ppb) US EPA IRIS (ppb) N-Nitrosodimethylamine N- Nitrosomethylethylamine N-Nitrosodiethylamine N-Nitrosodi-n- propylamine N-Nitrosopyrrolidine N-Nitrosomorpholine---- N-Nitrosopiperidine---- N-Nitrosodi-n-butylamine N-Nitrosodiphenylamine707

6 Proposed Additions to Table 3.1 Elastomer MaterialsRequired Analyses Ethylene-propylene-diene monomer (EPDM) GC/MS, VOCs, phenolics (by GC/MS base/acid scan), phthalates, PNAs, Nitrosamines NeopreneGC/MS, VOCs, phenolics (by GC/MS base/acid scan), phthalates, PNAs, chloroprene, Nitrosamines Nitrile-butadiene rubber (NBR, BUNA-N) GC/MS, VOCs, phenolics (by GC/MS base/acid scan), phthalates, PNAs, 1,3-butadiene, acrylonitrile, Nitrosamines Styrene-butadiene rubber (SBR)GC/MS, VOCs, phenolics (by GC/MS base/acid scan), phthalates, PNAs, 1,3-butadiene, styrene, Nitrosamines Analysis for N-Nitrosodimethylamine, N-Nitrosomethylethylamine, N- Nitrosodiethylamine, N-Nitrosodi-n-propylamine, N-Nitrosopyrrolidine, N- Nitrosomorpholine, N-Nitrosopiperidine, N-Nitrosodi-n-butylamine, and N-Nitrosodiphenylamine are required when material is sulfur cured.

7 EPA Method 521: Determination of Nitrosamines in Drinking Water by Solid Phase Extraction and Capillary Column Gas Chromatography with Large Volume Injection and Chemical Ionization Tandem Mass Spectrometry (MS/MS) - September, 2001 EPA Document#: EPA/600/R-05/054

8 Actions requested by the Committee Recommendation to ballot the proposed changes.


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