Spatial/Temporal Characterization and Risk Assessment of Trace Metals in Mangla Reservoir, Pakistan

Table 1

Certified versus measured concentrations (g/L) of trace metals in standard reference material (SRM 1643d).

Metal	Certified concentration	Measured concentration
Cd	6.47 ± 0.37	6.09 ± 0.28
Cr	18.53 ± 0.20	19.7 ± 0.24
Co	25.00 ± 0.59	22.3 ± 0.41
Cu	20.5 ± 3.8	19.2 ± 2.1
Fe	91.2 ± 3.9	92.6 ± 3.5
Mn	37.66 ± 0.83	36.1 ± 0.67
Ni	58.1 ± 2.7	61.2 ± 2.1
Pb	18.15 ± 0.64	19.7 ± 0.83
Zn	72.48 ± 0.65	69.6 ± 0.94