Ref. No. [UMCES]CBL 2013-018
ACT VS12-04
intensities (panel B) was linear. As expected from the optical match-up noted in Figure 1, the
concentration response to Carbazole was much greater than for any other compound, including
#2 Diesel fuel (Fig. 2A). The baseline signal was very low high, averaging around 100 ppb Oil
in deionized water. When challenge compound concentrations are normalized to EMM
QSE
intensities all compounds showed a comparable, linear response (Fig. 2B). 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 FP 360 sc fluorometer did
not detect the dye additions of this compound. Spectroscopically derived CDOM levels were
compound specific and reached asymptotes above 10 ppb additions, well below the instruments’
response capacity (
ca
50,000 ppb Oil for Carbazole and QS).
12
