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Table 6 Percent recovery of reference material by digestion (Expected values)

From: Evaluation of heavy metals content in dietary supplements in Lebanon

  As (μg/g) Cd (μg/g) Cr (μg/g) Hg (μg/) Pb (μ/g)
Tomato leave Certified (NIST 1573a) 0.112 ± 0.004 1.52 ± 0.04 1.99 ± 0.06 0.034 ± 0.004 -
Measurement 0.111 ± 0.008 1.55 ± 0.06 1.95 ± 0.05 0.033 ± 0.006 -
% Recovery 99 101 98 97 -
Soil Certified (NIST 2586) 8.7 ± 1.5 2.71 ± 0.54 301 ± 45 0.367 ± 0.038 432 ± 17
Measurement 7.9 ± 2.1 2.49 ± 0.47 268 ± 27 0.342 ± 0.027 411 ± 24
% Recovery 91 92 89 93 95