Simultaneous dissolution of organic acids in sequential leaching of sediment bound trace metals
作者:
S. Karlsson,
K. Håkansson,
B. Allard,
期刊:
Journal of Environmental Science and Health . Part A: Environmental Science and Engineering
(Taylor Available online 1987)
卷期:
Volume 22,
issue 6
页码: 549-562
ISSN:0360-1226
年代: 1987
DOI:10.1080/10934528709375370
出版商: Taylor & Francis Group
关键词: Sequential Leaching;Organic Acids;Humic and Fulvic Acid;Cadmium;Copper;Iron;Manganese;Zinc
数据来源: Taylor
摘要:
Inorganic metal‐solid assocations can somewhat arbitrarily be characterized in various extraction procedures. The simultaneous extraction of organics (humic and fulvic acids, HFA, characterized by their UV absorbance) has been studied in the sequential leaching of sediment bound trace metals (Cd, Cu, Fe, Mn and Zn). Typically 2–5% of the total HFA would follow the ion exchangeable fraction, 4–10% the carbonate/hydroxide fraction and 7–13% the hydrous oxide fration. Essentially no HFA remains after wet oxidation with H2O2/HNO3. From the distribution of the metals and the HFA between the various leaching steps it appears that organics can constitute a significant structural component of the amorphous hydrous oxide phase (iron and manganese) which partly prevent the distribution of this fraction in reducing acidic media (NH2OH‐HC1).
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