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Table 1 Analytical parameters of method

From: Determination of Sudan red contaminants at trace level from water samples by magnetic solid-phase extraction using Fe@NiAl-layered double hydroxide coupled with HPLC

Compounds Regression equation Linear range (μg L−1) R 2 Precisions (%, n = 6) LOD (μg L−1)
Sudan II y = 31080x − 53102 0.01–300 0.997 2.81 0.004
Sudan III y = 39097x + 3167.6 0.01–300 0.999 1.21 0.002
Sudan IV y = 39975x − 15884 0.01–300 0.999 5.07 0.005