Table 3.

Effects of the interferences ions on the recoveries of the examined metal ions.

Foreign ions	Recovery (%)
	Cd	Co	Fe	Ni	Zn
Mg+2	83.7	100	39	73	100
Ba+2	72.7	95.5	68	76.7	96.3
Bi+	100	71	86.1	100	88.9
Na+	72.4	65.5	94.2	44.6	87.1
K+	90	69.4	100	32.8	91.3