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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 (%)
Sudan II Sudan III Sudan IV
Changping Park water 0 nd nd nd
5 104.8a ± 2.8b 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 ndc 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
  1. aMean of three determinations
  2. bStandard deviation for three determinations
  3. cNot detected