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- W2030785673 abstract "Dissolved organic matter (DOM) was leached from eight distinct samples of leaves taken from six distinct trees (red maple, bur oak at three times of the year, two sugar maple and two white spruce trees from disparate soil types). Multiple samples were taken over 72–96 h of leaching. The size and optical properties of leachates were assessed using asymmetrical flow field-flow fractionation (AF4) coupled to diode-array ultraviolet/visible absorbance and excitation–emission matrix fluorescence detectors (EEM). The fluorescence of unfractionated samples was also analyzed. EEMs were analyzed using parallel factor analysis (PARAFAC) and principal component analysis (PCA) of proportional component loadings. Both the unfractionated and AF4-fractionated leachates had distinct size and optical properties. The 95% confidence ranges for molecular weight distributions were determined as: 210–440 Da for spruce, 540–920 Da for sugar maple, 630–800 Da for spring oak leaves, 930–950 Da for senescent oak, 1490–1670 for senescent red maple, and 3430–4270 Da for oak leaves that were collected from the ground after spring thaw. In most cases the fluorescence properties of leachates were different for individuals from different soil types and across seasons; however, PCA of PARAFAC loadings revealed that the observed distinctiveness was chiefly species-based. Strong correlations were found between the molecular weight distribution of both unfractionated and fractionated leachates and their principal component loadings (R2 = 0.85 and 0.95, respectively). It is concluded that results support a species-based origin for differences in optical properties." @default.
- W2030785673 created "2016-06-24" @default.
- W2030785673 creator A5017401964 @default.
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- W2030785673 date "2013-09-01" @default.
- W2030785673 modified "2023-10-18" @default.
- W2030785673 title "Distinguishing dissolved organic matter at its origin: Size and optical properties of leaf-litter leachates" @default.
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- W2030785673 doi "https://doi.org/10.1016/j.chemosphere.2013.03.062" @default.
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