Assertion: naphtha's component | /r/HasProperty | determined on weekly basis
Facets:
Source sentences:
text: To do this, 12 components ( Table 2 ) that were present at sufficiently high levels in the HSRN sample ( Appendix A ) for use as analytical markers were selected from a cross section of the peak retention times and concentrations in the exposure chambers were determined on a weekly basis to confirm that the exposure conditions were maintained over the entire study period.