Determination of copper(II) by flame atomic absorption spectrometry after its perconcentration by a highly selective and environmentally friendly dispersive liquid–liquid microextraction technique

Journal of Analytical Science and Technology

Table 3 Tolerance limits for interferences in determination of 50.0 μg L⁻¹ Cu(II) ions

Foreign species	Tolerated ratio (W_species/W_Cu(II))
NO₃⁻, Cl⁻, BrO₃⁻, ClO₄⁻, S₂O₈²⁻, Cr³⁺, Cr⁶⁺, Mn²⁺, Li⁺, Co²⁺, K⁺, Al³⁺, Pd²⁺, Ni²⁺, Ag⁺	5000
PO₄³⁻, IO₄⁻, F⁻, SO₃²⁻, citrate, S₂O₅²⁻, SCN⁻, CN⁻, HCOO⁻, acetate, CO₃²⁻, C₂O₄²⁻, Ba²⁺, Zn²⁺, Fe²⁺, Fe³⁺	1000
ClO₃⁻, NO₂⁻, Cd²⁺	500
Hg²⁺	100
Sn²⁺, Pb²⁺	10