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

Table 4 Summary table for Uncertainty Budget for purity determination in (g/100g) by electro-gravimetry

Sources	X	u_std(x)	u_std(x) / X	Uc(%)	U_Ex(%); k=2
Precision (P)	99.969%	0.0069%	0.00007	0.134	0.268
Atomic mass of PbO_2; (At. Wt)	239.199 g	0.0577 g	0.000241
Balance (Mettler 220 g); (W_metal)	2.015 g	0.00005 g	0.000025
Balance (Sartorious 41kg) (W_{Obs. stock solution})	2012.734 g	0.1345 g	0.000067
Error buoyancy; (Bu w.r.t W_{true mass stock soln.})	2014.745 g	2.0012 g	0.000993
weight of PbO₂ (Mettler 220 g) (W_ppt)	0.0584 g	0.00005 g	0.000856
Weight of soln. for deposition(Mettler 220 g) (W_aliquote)	50.5618 g	0.00005 g	0.000001

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