Accession Number:

ADA222447

Title:

Surface Changes in Well Casing Pipe Exposed to High Concentrations of Organics in Aqueous Solution

Descriptive Note:

Special rept.

Corporate Author:

COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Personal Author(s):

Report Date:

1990-03-01

Pagination or Media Count:

19.0

Abstract:

This preliminary study was undertaken to assess how the surface structural characteristics of four common well casing materials-polyvinyl chloride PVC, Teflon polytetrafluoroethylene, PTFE, stainless steel 304 SS304 and stainless steel 316 SS316-are affected by exposure to an aqueous solution containing tetrachloroethylene, toluene, p-dichlorobenzene and 0- dichlorobenzene in concentrations near their solubility. Casing samples that had been exposed to a test solution for 1 week, 1 month and 6 months were examined with a scanning electron microscope SEM and compared with control samples placed in well water for an equivalent time period. Pieces of casing that had not been placed in any aqueous solution were also examined and are assumed to be representative of the initial structure of the casings surface. These organics are of concern at hazardous waste sites, where they often occur in ground water. The observations indicate that the surface characteristics of PVC, SS316 and SS304 did not change when exposed to the organic aqueous solution. The surface variability and lack of distinguishing features at high magnification made it difficult to tell if the PTFE surface had changed. However, no obvious changes swelling, pitting etc. were seen. Keywords Groundwater monitoring, Hazardous waste, Organic chemicals, Well casings, Hydrology.

Subject Categories:

  • Polymer Chemistry
  • Hydrology, Limnology and Potamology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE