Table5

Foreign Ions	Tolerance limits mg mL⁻¹
Foreign Ions	I	II	III	IV
Na⁺, Li⁺	12500	12000	11000	13000
K⁺, Mg²⁺	10000	10000	9000	10500
Ca²⁺, Sr²⁺	8000	7500	7000	8000
Ba²⁺, Sn²⁺	5000	4000	4000	4500
Al³⁺, Bi³⁺	2500	2000	2250	2500
Ti⁴⁺, Sn⁴⁺	1000	200	900	1100
Mn²⁺, Ca²⁺	600	500	600	700
Fe³⁺, Cr³⁺	400	375	360	450
Cu²⁺, Ni²⁺	240	200	225	300
Cd²⁺,	130	120	120	150
Ag⁺, Hg⁺	80	75	70	20
V⁵⁺, W⁶⁺	50	40	45	60
Mo⁶⁺, Cr⁶⁺	25	20	25	30
Zn²⁺	8	10	12	15
Cl^-, I^-	7500	7000	7250	8000
C₂O₄^2-, CO₃^2-	5000	6200	6000	2200
SO₄^2-, NO^3-	5000	5000	4700	5500
B₄O₇^2-, P₂O₄^2-	10000	9000	9500	10000

Table 5: Effect of foreign ions, tolerance limits in the determination of μg mL⁻¹ of Pb²⁺ using polyester (I-IV).