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Table 2 Determination of Cd, Cu, and Pb in (SRM-1573a tomato leaves) reference material

From: Mucor pusillus immobilized Amberlite XAD-4 biocomposites for preconcentration of heavy metal ions by solid-phase extraction method

Element Certified (mg/kg)a Found (mg/kg) Relative error, %
Cd 1.52 ± 0.04 1.45 ± 0.02 − 5
Cu 4.70 ± 0.14 4.52 ± 0.15 − 4
Pb 4.0 ± 0.1 3.72 ± 0.08 − 7
  1. Pb was added to the solutions of SRM-1573a tomato leaves
  2. aMean of five determinations at 95% confidence level (\( \overline{x} \)±\( ts/\sqrt{N} \))