Development and Validation of a Fieldable Technique for Determining TriethylamineContent in Trichlorethylene, Project No. CST-12:MS-99-0006

摘要

A rapid, simple extractive technique to determine the TEA concentration in TCEusing colorpHast pH test strips has been developed. In this extraction method a sample of the TCE used in parts cleaning operations is added to and shaken with an equal volume of a dilute (0.001N,pH 3.0)nitric acid solution. The TCE phase separates from the aqueous nitric acid solution while the TEA extracts into the aqueous solution. The pH of the resulting aqueous solution is measured using the colorpHast test strips. The test strips undergo a significant color change at pH 5,equivalent to a TEA concentration of 100 ppm. Of the pH test strips tested,the colorpHast test strips give the clearest and most distinct color change at the pH of interest. The standard test protocol and extraction test instructions are included in Appendix 1,and have been incorporated into a certified test kit.