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Table 1 Effect of type and concentration eluting solution (4 mL) on analytes recovery (%)

From: Salicylic acid functionalized silica-coated magnetite nanoparticles for solid phase extraction and preconcentration of some heavy metal ions from various real samples

Eluent Recovery% (N = 5)a
Type Concentration (mol L-1) Cu(II) Ni(II) Cd(II) Cr(III)
HCl 1.0 22 ± 2 33 ± 2 29 ± 2 15 ± 2
  2.0 25 ± 1 70 ± 1 42 ± 1 29 ± 1
  4.0 90 ± 3 92 ± 2 85 ± 2 31 ± 2
H2SO4 1.0 19 ± 1 25 ± 2 34 ± 1 32 ± 1
  2.0 26 ± 3 32 ± 2 40 ± 1 36 ± 3
  4.0 54 ± 2 47 ± 1 51 ± 2 43 ± 2
HNO3 1.0 98 ± 1 97 ± 1 99 ± 1 98 ± 1
  2.0 98 ± 1 97 ± 1 99 ± 1 97 ± 1
  4.0 96 ± 2 97 ± 2 98 ± 2 98 ± 2
  1.0 36 ± 2 28 ± 2 20 ± 2 24 ± 2
HClO4 2.0 41 ± 1 28 ± 2 26 ± 1 26 ± 2
  3.0 45 ± 2 28 ± 1 35 ± 2 26 ± 2
CH3COOH 1.0 9 ± 3 18 ± 2 9 ± 3 8 ± 2
  2.0 12 ± 2 19 ± 2 11 ± 2 14 ± 2
  4.0 13 ± 2 18 ± 1 12 ± 2 16 ± 2
  1. a Mean of five determinations ± standard deviation