Research Article

Estimation of Measurement Uncertainties for the DGT Passive Sampler Used for Determination of Copper in Water

Table 5

Uncertainty budget for determination of time weighted average concentration of Cu2+ in water using a DGT passive sampler.

SymbolSource of uncertaintyTypeStandard uncertainty DistributionDivisor (M) μg L−1

Determination of accumulated massA gNormal10.49
Determination of contaminationA g Normal10.02
Diffusion coefficient in waterA m2/sNormal10.16
Thickness of material diffusion layer (MDL)B mRectangular0.33
Diffusion coefficient in MDLA m2/sNormal10.16
Diffusion boundary layerB mRectangular0.29
TimeB624 sRectangular0.01
Effective areaA m2normal10.69
Uc ()Combined standard uncertaintyNormal0.98
Uc ()Expanded standard uncertaintyNormal ()1.95