TABLE 4.

Analytical results for purity of the original La₂O₃ sample by the oxide weighing method ^{a , b} .

Run no.	Sample mass, g	Recovered La2O3, g	Unprecipitated La, μg	La in precipitate, %	Unprecipitated La, %	Purity of original La2O3 c , %
1	0.94130	0.94062	386 ± 4.1	99.928	0.048	99.976 ± 0.003
2	0.95886	0.95874	525 ± 4.8	99.988	0.064	100.052 ± 0.009
3	0.77350	0.77274	474 ± 4.2	99.901	0.072	99.973 ± 0.005
4	0.87258	0.87149	467 ± 4.2	99.875	0.063	99.938 ± 0.003
5	0.99128	0.99056	370 ± 3.6	99.928	0.044	99.972 ± 0.005
6	0.87286	0.87206	515 ± 4.0	99.908	0.069	99.977 ± 0.006
7	0.86632	0.86570	492 ± 4.6	99.928	0.067	99.995 ± 0.005
8	0.88910	0.88874	420 ± 3.4	99.959	0.055	100.014 ± 0.011
9	0.85972	0.85850	553 ± 3.5	99.859	0.075	99.934 ± 0.006
10	0.98191	0.98119	532 ± 3.8	99.926	0.064	99.990 ± 0.005
					Mean	99.982 ± 0.012

^aCalculated based on the weighing form as La₂O₃.

^bEach value following "±" indicates the combined standard uncertainty (k = 1).

^cThe purity value of original La₂O₃ was corrected by the mass fraction of impurities.