Estimation of Measurement Uncertainties for the DGT Passive Sampler Used for Determination of Copper in Water
Table 6
Results from sensitivity analysis, showing the effect on total uncertainty of the passive sampler measurement from reductions in uncertainty of selected parameters.
Parameter
Change in uncertainty
Result on total uncertainty
Effective area,
50% reduction
Reduction from 7.6% to 6.1% in overall relative uncertainty
Recovery factor,
50% reduction
Reduction from 7.6% to 6.9% in overall relative uncertainty
Diffusion boundary layer,
From 0.05 mm to 0.014 mm standard uncertainty
Reduction from 7.6% to 7.3% in overall relative uncertainty
Diffusion pathway thickness
50% reduction
Reduction from 7.6% to 7.3% in overall relative uncertainty
Diffusion pathway thickness
4 times increase
Increase from 7.6% to 12.2% in overall relative uncertainty