SOURCE APPORTIONMENT OF PAHS IN SEDIMENTS USING FACTOR ANALYSIS BY TIME RECORDS

SOURCE APPORTIONMENT OF PAHS IN SEDIMENTS
USING FACTOR ANALYSIS BY TIME RECORDS:
APPLICATION TO LAKE MICHIGAN, U.S.ASpeakers:Dr. Erik R. Christensen
Department of Civil Engineering and Mechanics,
University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USAABSTRACTApportionment of sources of polycyclic aromatic hydrocarbons (PAHs) by a factor analysis model based on time records for-seven sediment cores from central Lake Michigan is reconsidered to provide a more quantitative treatment, and one additional factor (source). The effect of mixing depth was observed on the unmixed fluxes, and a computer program was developed for estimation of the average P AH fluxes from the reconstructed P AH records. The new factor analysis model with nonnegative constraints includes not only scaling but also back scaling which improved the source apportionment significantly. One core, CLM-A, was an outlier and was omitted from the analysis. Wood Burning was identified as a third major source of PAHs in the area (20% of the total PAH flux). The other two sources petroleum (traffic), 45%, and coal (coke oven emissions), 35%, became more apparent, where the contributions are based on the sum of concentrations of sixteen PAH compounds. A reduced mixing depth (1.0 - 1.5 cm) was found to be more appropriate than the originally estimated mixing depth (1.5 - 2.0 cm).

Location: Kaprielian Hall (KAP) - rielian Hall, Room 156

Audiences: Everyone Is Invited

Contact: Evangeline Reyes