Summary FICP report : interlaboratory study on the analysis of chlorophenols in natural waters / by Yvonne D. Stokker and A.S.Y. Chau. : En13-5/88-112E-PDF

"An interlaboratory study for the analysis of chlorophenols in natural waters was conducted for the Federal Interdepartmental Committee on Pesticides (FICP) Check Sample Program. Participants were requested to analyze for phenol and eight chlorinated phenols in five test samples. The results of the study indicated that most laboratories have the capability of performing sensitive and isomer-specific analysis for chlorophenols in water. Comparable satisfactory results were generated for pentachlorophenol and higher chlorinated phenols. In the analysis of phenol and the two monochlorophenols, however, the data for the "standard" solutions were considerably better than those for the water samples. Thus, it was believed that the extraction procedures and not the derivatization and analysis were most likely to be the major sources of error for these compounds in this study. The intralaboratory precision (or in-house reproducibility) for the majority of participating laboratories was very good. However, the interlaboratory precision (or between-lab repeatability) for the same compound was extremely poor. This would suggest that there could be a need for more accurate analytical standard solutions as well as external reference solutions to which they can be compared in order to monitor their accuracy over time. Lastly, this study also indicated that at least one laboratory could benefit from more stringent in-house quality control"--Abstract, page ii.

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