Table 3 Measured and certified values of the metals in SRM 2709a and SRM 1640a.
From: Toxic and heavy metals contamination assessment in soil and water to evaluate human health risk
Metal | Certified value SRM 2709a (µg g−1) | Measured value \(\left( {\overline{x} \pm ts/\surd n} \right)\) | Certified value SRM 1640a (µg kg−1) | Measured value \(\left( {\overline{x} \pm ts/\surd n} \right)\) | % Recovery SRM 2709a/SRM 1640a |
---|---|---|---|---|---|
Toxic metals | |||||
Cr | 130 ± 9 | 132.9 ± 2.7 | 40.22 ± 0.28 | 39.20 ± 1.52 | 102.2/97.5 |
Mn | 529 ± 18 | 527.9 ± 1.8 | 40.07 ± 0.35 | 39.13 ± 1.32 | 99.8/97.6 |
Cu | 33.9 ± 0.5 | 33.5 ± 0.67 | 85.07 ± 0.48 | 85.34 ± 0.58 | 98.8/100.3 |
As | 10.5 ± 0.3 | 11.3 ± 0.52 | 8.010 ± 0.067 | 8.00 ± 0.59 | 107.6/99.8 |
Heavy metals | |||||
Cd | 0.371 ± 0.002 | 0.362 ± 0.04 | 3.961 ± 0.072 | 3.690 ± 0.279 | 97.6/93.2 |
Ba | 979 ± 28 | 973.3 ± 7.8 | 150.60 ± 0.074 | 151.88 ± 1.224 | 99.4/100.8 |
Hg | 0.09 ± 0.02 | 0.09 ± 0.004 | – | – | 100/– |
Pb | 17.3 ± 0.10 | 17.8 ± 0.29 | 12.005 ± 0.040 | 11.887 ± 0.389 | 102.9/99.0 |