From: Selective masking and demasking for the stepwise complexometric determination of aluminium, lead and zinc from the same solution
Sample
Constituents
Certified values of NBS 1412
Results obtained by proposed method
Result obtained by the standard method10
1.
Al2O3%
7.52
7.54 ± 0.11
7.59 ± 0.13
2.
PbO %
4.40
4.42 ± 0.08
4.38 ± 0.09
3.
ZnO %
4.48
4.47 ± 0.08
4.42 ± 0.09