Determining the Concentration of Oil in Water Samples by Infrared Spectrophotometry. Phase II. Interlaboratory Study. Volume II.

摘要

An interlaboratory study to validate a method for measuring the concentration of oil in water was conducted with the active participation of seven laboratories. This volume (Volume II) contains discussions and derivations of some of the procedures in the statistical analysis used in this study, results at a greater level of detail, and results based on the inclusion of sample aging as well as calibration corrections. The effect of these two corrections were studied by generating two additional sets of modified data which incorporate the corrections and repeating many of the analyses performed with the original data set. The calibration correction is based on fitting an inverse linear least squares regression line to the calibration data and generating a revised second set of laboratory reported concentrations using this calibration curve. The aging corrections are based on the results of the Sample Aging Study in Phase I of this effort.