EPA Science Inventory

Predicting the Migration Rate of Dialkyl Organotins from PVC Pipe into Water

Citation:

Adams, W. A., Y. Xu, J. C. Little, A. F. Fristachi, G. E. RICE, AND C. A. IMPELLITTERI. Predicting the Migration Rate of Dialkyl Organotins from PVC Pipe into Water. ENVIRONMENTAL SCIENCE AND TECHNOLOGY. John Wiley & Sons, Ltd., Indianapolis, IN, 45(16):6902-6907, (2011).

Description:

Organotins (OTs) are additives widely used as thermal and light stabilizers in polyvinyl chloride (PVC) plastics. OTs can leach into water flowing through PVC pipes. This work examines the leaching rates of two neurotoxic OTs, dimethyl tin (DMT) and dibutyl tin (DBT), from PVC pipe. Water was circulated in a closed loop laboratory PVC pipe system. Using a gas chromatograph pulsed flame photometric detector (GC PFPD), the change in concentrations of DMT and DBT in the water in the system was monitored over time and allowed to reach equilibrium. OT concentration as a function of time was analyzed using a mechanistic leaching rate model. The diffusion coefficient for OT in the PVC pipe material, the only unknown model parameter, was found to be 9×10−18 m2/s. This value is consistent with the range of values estimated from the literature (1.6×10−18 and 2.4×10−17 m2/s) increasing confidence in the leaching rate model.

Purpose/Objective:

To inform the public.

URLs/Downloads:

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Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 04/06/2012
Completion Date: 04/06/2012
Record Last Revised: 09/15/2011
Record Created: 04/06/2011
Record Released: 04/06/2011
OMB Category: Other
Record ID: 234587

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

WATER SUPPLY AND WATER RESOURCES DIVISION

WATER QUALITY MANAGEMENT BRANCH