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