Interaction of trace elements in acid mine drainage solution with humic acid

Water Research
Siripat SuteerapataranonKate Grudpan

Abstract

The release of metal ions from a coal mining tailing area, Lamphun, Northern Thailand, is studied by leaching tests. Considerable amounts of Mn, Fe, Al, Ni and Co are dissolved in both simulated rain water (pH 4) and 10 mg L(-1) humic acid (HA) solution (Aldrich humic acid, pH 7). Due to the presence of oxidizing pyrite and sulfide minerals, the pH in both leachates decreases down to approximately 3 combined with high sulfate concentrations typical to acid mine drainage (AMD) water composition. Interaction of the acidic leachates upon mixing with ground- and surface water containing natural organic matter is simulated by subsequent dilution (1:100; 1:200; 1:300; 1:500) with a 10 mg L(-1) HA solution (ionic strength: 10(-3) mol L(-1)). Combining asymmetric flow field-flow fractionation (AsFlFFF) with UV/Vis and ICP-MS detection allows for the investigation of metal ion interaction with HA colloid and colloid size evolution. Formation of colloid aggregates is observed by filtration and AsFlFFF depending on the degree of the dilution. While the average HA size is initially found to be 2 nm, metal-HA complexes are always found to be larger. Such observation is attributed to a metal induced HA agglomeration, which is found even at l...Continue Reading

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Citations

Jun 2, 2014·Environmental Monitoring and Assessment·Erick Aranda-GarcíaEliseo Cristiani-Urbina
Apr 5, 2011·Journal of Hazardous Materials·Wenzhou LuChuxia Lin
Jul 6, 2010·Journal of Hazardous Materials·Jinnan WangYan Li
Nov 15, 2008·Journal of Contaminant Hydrology·Horst Geckeis, Thomas Rabung
Nov 20, 2013·Environmental Toxicology and Chemistry·Aleicia HollandSusan H W Kinnear
Nov 9, 2012·Archives of Environmental Contamination and Toxicology·Aleicia HollandSusan H W Kinnear

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