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- W1988206816 abstract "Abstract To assess effects of industrial and environmental pollution on analytical characteristics of humic substances, we isolated humic acids (HA's) and fulvic acids (FA's) from unpolluted and polluted soils and sediments. Following purification, the HA's and FA's were characterized by elemental (C, H, O, N, S) and functional group (CO2H, phenolic OH, total acidity) analyses, infrared (IR) spectrophotometry, differential thermal analysis (DTA) and by metal (Fe, Al, Cu, Mn, Pb, Ni, Co, Zn, Cr, Cd, Hg, Ca and Mg) analyses. Si was also determined in all samples. Polluted HA's and FA's contained more N and S but less 0 and were richer in all metals and Si than were unpolluted ones. IR spectra showed that polluted humic materials were enriched in COO‐ groups, secondary non‐cyclic amides and possible also in SO3H groups. DTA curves indicated that polluted HA's and FA's were more thermostable than unpolluted HA's and FA's. Unusually high N, S, Cu, Cr, Zn and Hg contents of humic materials appear to be useful indicators of soil and sediment pollution." @default.
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- W1988206816 date "1980-01-01" @default.
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- W1988206816 title "Effects of pollution on humic substances" @default.
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- W1988206816 doi "https://doi.org/10.1080/03601238009372194" @default.
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