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

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

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