Abstract
Although an indirect method is widely used to evaluate oil sorption capacity of fiber materials for remediating oily water, a direct method has recently been proposed. To compare two methods, we first studied the effect of extraction time, the accuracy and precision for the direct method. Similarly, precision of the indirect method and the underlying sources of error were also investigated. The minimal extraction time required for the direct method was found to be 180 min. The relative error of direct method was less than 2.61 %, its standard deviation was less than 1.60 %o, and its coefficient of variation was less than 0.313 %. The standard deviation of the indirect method was more than 55.1 %, and its coefficient of variation was more than 16 %. The error in the indirect method mainly came from the heterogeneity of oily water, which led to large, random differences between samples that could not be eliminated.
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