Application of an Activated Carbon-Based Support for Magnetic Solid Phase Extraction Followed by Spectrophotometric Determination of Tartrazine in Commercial Beverages

Table 5

Parameters of the regression line for signal (AU) versus tartrazine concentration (mg L⁻¹) plot.

Parameter	Value
Root mean square deviation,	0.013
Intercept, ±  ts ()	0.010 ± 0.031
Slope, ± ts ()	0.041 ± 0.003
Linear interval (mg L^−1)	3.0–30.0
Limit of detection (mg L^−1)	1.0
Repeatability (%RSD, = 3, 10.0 mg L^−1)	1.8
Reproducibility (%RSD, = 9, 10.0 mg L^−1)	3.2