Ref. No. [UMCES]CBL 2013-021
ACT VS12-05
Baseline signal and noise more than doubled in this last trial against #2 Diesel Fuel and there
was no response to increasing concentration, indicating likely instrument failure that occurred
during shipping between test sites. When challenge compound concentrations were normalized
to EMM
QSE
intensities, the ECO showed the expected linear response to Quinine Sulfate (Fig.
2B). The EEMs intensities for NDSA, Carbazole, and Diesel Fuel #2, normalized to the optical
window of the ECO were not sufficiently variable or high enough to elicit a clear response.
Ancillary water quality conditions for turbidity and CDOM are presented for each challenge
compound at each of the concentrations tested (Fig. 3). In general the challenge compounds,
except for BB3, had little effect on turbidity levels and the instrument response reflected the
fluorescence properties of the challenge compound. BB3 additions increased measured turbidity
but the FLCDRTD fluorometer did not detect the dye additions of this compound.
Spectroscopically derived CDOM levels were compound specific and reached asymptotes above
10 ppb additions.
