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

Table 3 Summary table for Uncertainty Budget for concentration determination in mg kg ^-1 by classical gravimetry

Sources	X	u_std(x)	u_std(x) / X	Uc(mg kg^-1)	U_Ex(mg kg^-1); k=2
Precision	1000.883 mg/kg	0.047 mg/kg	0.000047	1.22	2.44
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 (Saritorious 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	0.00005g	0.000675
Balance (Sartorios 41 kg) for stock solution	50.5918 g	0.00005 g	9.883E-07

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