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

Environmental Sciences Europe

Table 1 Analytical parameters of method

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