Application of Dispersive Liquid-Liquid Microextraction with Graphite Furnace Atomic Absorption Spectrometry for Determination of Trace Amounts of Zinc in Water Samples

Table 3

Influence of foreign ions.

Ions	Tolerance ratio
Ca^2+, Ba^2+, Mg^2+, Mn^2+, K^+, Na^+, Ni^2+, SO4^2−, NO3^−, Cl^−, NO2^−	500 : 1
Fe^2+, PO4^3−, Hg^2+, Cu^2+, HCO3^−, Ag^+, Pb^2+	300 : 1