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Table 3 Effect of interferences ions on preconcentration and determination of heavy metal ions

From: A new sorbent based on MWCNTs modification for separation/preconcentration of trace amounts of Cd(II), Cr(III), Cu(II), Ni(II), and Pb(II) and their determination by flame atomic absorption spectrometry

Interfering ion Tolerance limit (mg L−1)
Pb Cu Ni Cd Cr  
Ca2+, Mg2+, Na+, K+, Ni2+ Na+, K+, Mn2+, Ca2+ Na+, K+, Ca2+ K+, Na+, Fe3+ K+, Na+, NH4 + 650
Ni2+, Mn2+, Cu2+, Fe3+ Pb2+, NO3 , Mg2+, NH4 + Mn2+, Cd2+, Pb2+, Fe3+ Mn2+, NO3 , NH4 +, Mg2+ Mn2+, Ni2+, Cu2+, NO3 , 550
Cr3+, Zn2+, Cd2+ Ni2+, Hg2+, Ba2+, Cr3+, Zn2+, CH3COO Mg2+, Cu2+, NO3 , NH4 + Ca2+, Pb2+, Zn2+, Hg2+, Cu2+ Ca2+, Mg2+, Fe3+, Zn2+, Hg2+ 400
Co2+, NH4 +, Ba2+ C2O4 2−, SO4 2−, Co2+, Fe3+ Cr3+, Zn2+, Hg2+, Ba2+, Co2+ Ni2+, Co2+, Br Pb2+, Co2+, Ba2+, C2O4 2−, CH3COO 250
Hg2+, NO3−, CH3COO Br C2O4 2+, Br C2O4 2−, Ba2+ SO4 2−, Br 150
SO4 2−, Br, C2O4 2−   CH3COO, SO4 2− SO4 2−, CH3COO   100