Journal of Analytical Methods in Chemistry

Research Article

A Study of the Critical Uncertainty Contributions in the Analysis of PCBs in Ambient Air

Table 6

Comparison of the values of 𝑥 P C B , S R M and its expanded uncertainty calculated by each of the three approaches discussed in the main text.
Approach 𝑈 ( 𝑐 P C B , S R M ) 𝑥 P C B , S R M 𝑥 P C B , S R M
(1) Gravimetric (mass fraction domain)24.55.522.4%
(2) Volumetric (mass concentration domain)25.15.923.3%
(3) Gravimetric: calculations in the mass concentration domain26.96.122.7%