Journal of Analytical Science and Technology

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

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