Environmental Sciences Europe

Table 2 Analytical results in real water samples

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

Water sample	Spiked (μg L⁻¹)	Recovery (%)
Water sample	Spiked (μg L⁻¹)	Sudan II	Sudan III	Sudan IV
Changping Park water	0	nd	nd	nd
	5	104.8^a ± 2.8^b	99.3 ± 0.6	100.9 ± 2.8
	10	97.8 ± 2.7	98.7 ± 0.05	99.6 ± 1.7
Ming Tombs Reservoir	0	nd^c	nd	nd
	5	98.9 ± 2.0	100.3 ± 0.1	101.2 ± 2.0
	10	105.7 ± 2.7	99.8 ± 3.8	100.4 ± 4.4
Binhe Park water	0	nd	nd	nd
	5	97.6 ± 3.6	100.7 ± 4.2	102.4 ± 4.5
	10	100.6 ± 2.5	103.1 ± 4.9	101.8 ± 3.6

^aMean of three determinations
^bStandard deviation for three determinations
^cNot detected

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