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.
| Symbol | Source of uncertainty | Type | Standard uncertainty | Distribution | Divisor | (M) μg L−1 |
| | Determination of accumulated mass | A | g | Normal | 1 | 0.49 | | Determination of contamination | A | g | Normal | 1 | 0.02 | | Diffusion coefficient in water | A | m2/s | Normal | 1 | 0.16 | | Thickness of material diffusion layer (MDL) | B | m | Rectangular | | 0.33 | | Diffusion coefficient in MDL | A | m2/s | Normal | 1 | 0.16 | | Diffusion boundary layer | B | m | Rectangular | | 0.29 | | Time | B | 624 s | Rectangular | | 0.01 | | Effective area | A | m2 | normal | 1 | 0.69 | Uc () | Combined standard uncertainty | | | Normal | | 0.98 | Uc () | Expanded standard uncertainty | | | Normal () | | 1.95 |
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