The solid-phase extraction method is then used to investigate possible relationships between DOC characteristics and land use. By collecting surface water samples from sub-watersheds with unique land uses, statistically significant differences in DOC characteristics are observed. Sub-watersheds containing agricultural and forested land are found to produce DOC higher in molecular weight and aromatic structure than urban catchments. DOC from urban landscapes is found to be more hydrophobic than from other types of land use. Forested catchments produced DOC that is consistently different from that derived from the other types of land uses. In addition to land use, a limited number of environmental variables explain variations in DOC aromaticity, molecular weight and hydrophobicity. When combined with land use, the amount of solar radiation, precipitation and water temperature explain up to 80% of the variability observed in DOC characteristics. Results of this work suggest qualitative differences in DOC can influence copper complexation and the nature of DOC may vary significantly between surface waters as a result of land use.Sample Collection Procedure Sample preparation Before leaving the laboratory to collect field samples, a field kit is required ... water quality meters should be calibrated according to the instrument instruction manual before each sampling trip.
|Title||:||Characterization of Dissolved Organic Carbon: Assessment of Copper Complexation and Export of Carbon from Watersheds as a Function of Land Use|
|Publisher||:||ProQuest - 2008|