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Table 7 Results of an 'accuracy check' of the proposed method with standard reference material: NIST SRM 81a Glass Sand

From: Stepwise complexometric determination of aluminium, titanium and iron concentrations in silica sand and allied materials

Constituents Certified Reference Results as per certificate Set-I, % w/w, Results obtained using the proposed method Set-II, % w/w Results obtained by complexometry5 for Al, and colorimetry6 for Fe and Ti
Al2O3 0.66 0.67 ± 0.09 0.66 ± 0.10
Fe2O3 0.082 0.07 ± 0.02 0.08 ± 0.02
TiO2 0.12 0.15 ± 0.04 0.11 ± 0.04