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Table 2 Certified reference material (CRM) and metal recovery (%) for Pb, Zn and Cu metals

From: Heavy metals phyto-assessment in commonly grown vegetables: water spinach (I. aquatica) and okra (A. esculentus)

Heavy metals

Initial soil (mg/kg)

Spiked metal (mg/kg)

CRM (mg/kg)a

Measured (mg/kg)

Metal recovery (%)

Pb

1.23 ± 0.19

50.24 ± 0.38

204.0 ± 6.0

219.44 ± 17.06

107.57

Zn

0.41 ± 0.05

50.83 ± 0.86

380.0 ± 13.0

356.06 ± 19.26

93.70

Cu

0.55 ± 0.01

49.62 ± 0.22

80.7 ± 3.5

76.73 ± 10.61

95.08

  1. Mean ± standard deviation
  2. aBAM Germany certified reference material BRM#12-mixed sandy soil
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