Determination of Sodium Cromoglycate by a New Kinetic Spectrophotometric Method in Biological Samples

Table 2

Effect of foreign ions on the determination of 12 ng mL⁻¹ SCG.

Foreign species	Tolerated ratio; W species/W SCG
NO3^−,SO3^2−,I^−,CH3COO^−,S2O8^2−,K^+,Ba^2+, Pb^2+, Ni^2+, Na^+, Mg^2+, Cd^2+, Al^3+, Zn^2+, Se^4+, Cr^3+, and Co^2+	1000
Hg^2+	800
Ag^+	500
Cl^−	100