Contrasting spectroscopic characterization of dissolved organic matter in mine water of Huabei mining area,China——A case study from Dongtan Coal Mine
The sources and distribution of dissolved organic matter(DOM)in mine water of Huabei mining area were analyzed using the ultraviolet-visible absorption spectrum(UV-vis)method and three-dimensional excitation emission matrix fluorescence spectroscopy-parallel factor analysis(EEM-PARAFAC).Results showed that DOM concentration ranged from 0.17 mg/L to 3.10 mg/L,with a mean value of 1.57 mg/L;while the DOM concentrations changed from 0.12 mg/L to 3.76 mg/L,with a mean value of 0.69 mg/L in deep mine water,respectively.EEM-PARAFAC models and spectral parameter analysis identified higher molecular and low molecular weight humic acid-like structures,protein-like components dominated shallow and deep mine water DOM.Compared with shallow mine water,DOM had lower degrees of humification and more freshly terrestrial substances with higher BIX,E2/E3 ratio,SR,SUV254,and FI,lower HIX,β:α values in deep mine water owing to emulsion oil leakage.
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