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

Table 5 Summary table for Uncertainty Budget for concentration determination in mg kg ^-1 by electro-gravimetry

Sources	X	u_std(x)	u_std(x) / X	Uc (mg/kg)	U_Ex(mg kg^-1);k=2
Precision (C_MPb)	1000.813 mg/kg	0.069 mg/kg	0.000069	1.338	2.676
Atomic mass of PbO₂	239.199 g	0.0577 g	0.000241
Balance (Mettler 220 g)	2.015 g	0.00005 g	0.000025
Balance (Sartorious 41 kg)	2012.734 g	0.1345 g	0.000067
Error in buoyancy	2014.745 g	2.0012 g	0.000993
weight of PbO₂ (Mettler 220 g)	0.0584 g	0.00005 g	0.000856
Weight of solution taken for electro-gravimetry experiment (Mettler 220 g)	50.5618 g	0.00005 g	0.000001

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