The calculations for the statistical limit of detection (LOD) and limit of quantification (LOQ) were based on the standard deviation of y-intercepts of regression analysis (r) and the slope (S).
The LOD and LOQ were calculated from the ratio of 3 and 10 times of standard deviation of the measurement blanks (n = 11) to the slope of the linear section of calibration graph, was 1.5 lg L1 and 5.2 lg L1, respectively.