Interferent

Ionic radius

I

II

III

Ca2+

114

0.003162

0.004084

0.001468

Cd2+

109

0.00194

0.005995

0.001468

Ba2+

149

0.016518

0.008424

0.004338

Sr2+

132

0.018588

0.010248

0.004338

Cu2+

87

0.006571

0.005012

0.002746

Mg2+

86

0.011925

0.009602

0.003314

Hg2+

116

0.000593

0.002154

0.000353

Co2+

87

0.0103

0.008389

0.005926

Mn2+

97 - 81

0.010926

0.008389

0.003899

Pb2+

133

0.001191

0.001896

0.000947

NH4+

175

0.182085

0.065097

0.110069

Na+

116

0.096895

0.112421

0.068129

Ag+

129

0.012276

0.310117

0.195734