Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Mean values of sensor 1 (PBMA coating) obtained with xylene samples at the concentrations of 0.8 ppmv, 1.5 ppmv and 4.5 ppmv at annual intervals. The highest concentration was measured in triplicate, the others in duplicate. For the sake of clarity, error bars are not included. Regression lines were calculated with y = difference frequency shift [kHz] and x = c(xylene) [ppmv].
