Table 10. Linearity and recovery test of heavy metals analyzed
Element
Correlation coefficient (
R
2
)
Concentration (
μ
g/kg)
Recovery ± RSD (%)
Pb
0.9966
0.5
100.8 ± 10.3
2.0
104.8 ± 1.2
Cd
0.9999
0.5
97.0 ± 7.2
2.0
106.1 ± 0.3
Correlation coefficients were over 0.9966 at five concentration levels (0.0–2.0
μ
g/kg).