Analysis of Some Trace Metals in Fish Species after Preconcentration with Congo Red on Amberlite XAD-7 Resin by Flame Atomic Absorption Spectrometry

Table 4

Analysis of certified reference material (NRCC-DORM-2-Dogfish muscle) ().

Element	Certified value (μg/g)	Amount found (μg/g)	Recovery (%)
Cu(II)			99
Ni(II)			98
Fe(III)			97
Zn(II)			97
Cr(III)			99
Cd(II)			98
Pb(II)			97

± SD (standard deviation).