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Table 3 Results for metal ions determination in certified reference samples obtained using the optimum conditions.

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

Samples Certified value (μg g-1) Found by proposed method (μg g-1)a Calculated value of t-testb
Vehicle exhaust particulates (NIES-8) Cd:1.1, Cr:3.3, Cu:67, Ni:18.5 Cd: 1.06 ± 0.04, Cr: 3.2 ± 0.2; Cu: 66.5 ± 0.4, Ni: 18.4 ± 0.3 1.96, 2.49, 2.54, 2.74
Human hair (NIES-5) Cd: 5.2, Cu: 16.3, Ni: 1.8 Cd: 5.0 ± 4.0, Cu: 15.9 ± 2.8, Ni: 1.7 ± 4.8 2.23, 2.44, 2.00, 2.74
Tea leaves (NIES 7) Cd: 0.030, Cr: 1.3, Cu: 7.0, Ni: 6.5 Cd: 0.028 ± 0.001, Cr: 1.2 ± 0.1, Cu: 6.7 ± 0.1, Ni 6.2 ± 0.1 1.70, 2.60, 2.22, 2.51
Pepperbush (NIES-1) Ni: 8.7, Cd: 6.7 Ni: 8.8 ± 0.1, Cd: 6.6 ± 0.2, 1.34, 1.83
Zinc base diecasting alloy C (NBS-627) Cu: 1320, Cd:51, Ni:29 Cu: 1310.2 ± 1.2, Cd: 49.1 ± 4.1, Ni: 27.5 ± 4.6 1.39, 2.11, 2.65
  1. (N = 5)
  2. a Mean of five determinations ± standard deviation
  3. b texp shows the experimental student-t values at confidence limit 95%.