TY - JOUR
T1 - Fluorescence monitoring of ultrasound degradation processes
AU - Hassoon, Salah
AU - Bulatov, Valery
AU - Yasman, Yakov
AU - Schechter, Israel
N1 - Funding Information:
This work was supported by the Grand Water Research Institute and by the James Franck Program in Laser Matter Interaction. V.B. and Y.Y. thank the Israeli Ministry of Absorption for support provided to new immigrant scientists.
PY - 2004/6/4
Y1 - 2004/6/4
N2 - Ultrasound-based water treatment is often applied for degradation of stable organic pollutants, such as polycyclic aromatic hydrocarbons and halogenated compounds. Monitoring the degradation process, during the application of ultrasound radiation, is of considerable economical interest. In this work, the possibility of performing on-line spectral analysis during sonication was examined and it was found that direct absorption or fluorescence readings are misleading. Optical monitoring is strongly affected by the absorption and scattering of light by cavitation micro-bubbles and ultrasound induced particulates. A model was developed to account for these effects and to allow for on-line fluorescence analysis. The model takes into account the absorption and scattering coefficients of the micro-bubbles and particulates, as well as their time dependent concentration. The model parameters are found from independent measurements where the pollutants are added to already sonicated pure water. Then, the model is tested for predicting the actual fluorescence behavior during the sonication process. It has been shown that the model allows for recovery of the true degradation data, as obtained by off-line HPLC measurements.
AB - Ultrasound-based water treatment is often applied for degradation of stable organic pollutants, such as polycyclic aromatic hydrocarbons and halogenated compounds. Monitoring the degradation process, during the application of ultrasound radiation, is of considerable economical interest. In this work, the possibility of performing on-line spectral analysis during sonication was examined and it was found that direct absorption or fluorescence readings are misleading. Optical monitoring is strongly affected by the absorption and scattering of light by cavitation micro-bubbles and ultrasound induced particulates. A model was developed to account for these effects and to allow for on-line fluorescence analysis. The model takes into account the absorption and scattering coefficients of the micro-bubbles and particulates, as well as their time dependent concentration. The model parameters are found from independent measurements where the pollutants are added to already sonicated pure water. Then, the model is tested for predicting the actual fluorescence behavior during the sonication process. It has been shown that the model allows for recovery of the true degradation data, as obtained by off-line HPLC measurements.
KW - Data
KW - Degradation
KW - Ultrasound
UR - http://www.scopus.com/inward/record.url?scp=2342600248&partnerID=8YFLogxK
U2 - 10.1016/j.aca.2004.02.025
DO - 10.1016/j.aca.2004.02.025
M3 - 文章
AN - SCOPUS:2342600248
SN - 0003-2670
VL - 512
SP - 125
EP - 132
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 1
ER -