analysis. Further study showed that injection time of 240 s was more suitable for highly complex matrices analysis. According to these facts, validation parameters have been designated and applied in this paper for both methods (80 mM with 300 s and 120 mM with 240 s). Under the optimal conditions, the ENRO and CIP analysis by CE-UV using the FASS–sweeping technique was validated in terms of its linearity, repeatability, and LOD. The results were summa-rized in Table 1. Standard calibration curves were prepared by the injection of mixed-standard solutions at seven concentration