. 2023 Jul 12;8(29):26317–26324. doi: 10.1021/acsomega.3c02718

Table 4. Results of the Evaluation of Accuracy and Precision in the Preparation of Oily Water Standards from the Developed Procedure^a.

TOG theoretical concentration (mg L^–1)	average oil recovery (%)	coefficient of variation (%) (n = 5)
5	85.0	7.1
10	83.0	11.0
30	87.0	5.0
40	75.0	6.2
60	73.0	3.8
70	70.0	5.9

Determination of the TOG content was made by the gravimetric method.

Table 4. Results of the Evaluation of Accuracy and Precision in the Preparation of Oily Water Standards from the Developed Procedurea.