Parameter | Alkaline degradation | Acidic degradation | UV degradation | |||
---|---|---|---|---|---|---|
 | First derivative | Second derivative | First derivative | Second derivative | First derivative | Second derivative |
Concentration range(μg/ml) | 0.1-1.0 | |||||
LOD(μg/ml) | 0.022 | 0.013 | 0.033 | 0.043 | 0.014 | 0.028 |
LOQ(μg/ml) | 0.054 | 0.044 | 0.052 | 0.063 | 0.047 | 0.052 |
Correlation coefficient (r) | 0.9999 | 0.9994 | 0.9999 | 0.9998 | 0.9995 | 0.9996 |
Slope | 0.36 | 0.201 | 0.202 | 0.301 | 0.16 | 0.203 |
Intercept | 0.89 | 1.18 | -1.11 | 0.97 | 0.96 | 1.12 |
S y/x , Standard deviation of the residuals | 1.17 | 1.55 | 0.77 | 1.28 | 1.19 | 1.39 |
S a , Standard deviation of the intercept of the regression line | -0.43 | -0.44 | 0.58 | -0.34 | 0.74 | 0.68 |
S b , Standard deviation of the slope of the regression line | 1.46 × 10-3 | 1.94 × 10-3 | 9.59 × 10-4 | 1.59 × 10-3 | 1.56 × 10-3 | 1.82 × 10-3 |