Evaluation of purity with its uncertainty value in high purity lead stick by conventional and electro-gravimetric methods

Table 2 Summary table for Uncertainty Budget for purity determination in (g/100 g) by classical gravimetry

Sources	X	u_std(x)	u_std(x) / X	Uc(%)	U_Ex(mg kg^-1); k=2
Precision	99.976%	0.0048%	0.0000476	0.122	0.244
Atomic mass of PbSO₄	303.253 g	0.0578 g	0.000191
Balance (Mettler 220 g)	2.015 g	0.00005 g	0.000025
Balance (Sartorius 41 kg)	2012.734 g	0.1345 g	0.000067
Error in buoyancy	2014.745 g	2.0012 g	0.000993
Weight of PbSO₄ precipitate (Mettler 220 g)	0.0741 g	0.00005 g	0.000675
Weight of solution for deposition(Mettler 220 g)	50.5918 g	0.00005 g	9.883E-07

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