For intra-day the equation was y = 0.9966x + 0.0565 (R² = 1); for inter-day the equation was y y = 0,9941x + 0.0201, (R² = 0.9996). SD: standard deviation; RSD: relative standard deviation (coefficient of variation) For HPLC-FLD, repeatability, expressed as the the relative standard deviation (intra-day RSD) of was generally less than 5%, and accuracy was 95 to 105%. In addition, the following data were obtained: