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Luvsanchultem Jargal,Yong Il Lee 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.1
The transport of P sources (organic and inorganicphosphorus) using electrokinetic process through a low-permeabil-ity soil was investigated. A series of batch experiments was conductedto construct the adsorption isotherms of KH2PO4 and triethyl phos-phate (TEP) on kaolin soils. Approximately 60.3% of phosphorusfrom KH2PO4 was adsorbed within 24 hours, and the maximumadsorption (73%) was attained at 6 days after adsorption. In contrast,TEP showed no P adsorption in 7 days, thus suggesting an alter-native P source that may maintain a favorable proportion ofC:N:P through the effective delivery during in situ bioremediationin low permeability soils. Experiments using electrokinetic processwere carried out with electrokinetic reactor having a hydraulicconductivity of 1.99×107 cm s1 for a 0.01M NaCl aqueous solution.TEP and KH2PO4 were used as organic P source and inorganic Pnear the platinum anode and near the platinum cathode, respec-tively. Potassium dihydrogen phosphate was not distributed uni-formly along the soil column and most of transported phosphoruswas changed to water-insoluble aluminum phosphate after 12 daysof treatment, indicating the decrease of bioavailability of the phos-phorus. In case of TEP, the advancing P front progressed with time,resulting in uniform P distribution through the kaolin column. Interms of transport, organic phosphorus, TEP, would be a moreeffective P source than inorganic phosphorus, KH2PO4, in electro-kinetic enhanced bioremediation.
Kim, Yeongmin,Lee, Insung,Oyungerel, Sodnom,Jargal, Luvsanchultem,Tsedenbal, Tserenjav Elsevier 2019 Ore geology reviews Vol.104 No.-
<P><B>Abstract</B></P> <P>The copper (δ<SUP>65</SUP>Cu) and sulfur (δ<SUP>34</SUP>S) isotope compositions of ore minerals from the Erdenetiin Ovoo porphyry Cu-Mo deposit in northern Mongolia were measured. The δ<SUP>65</SUP>Cu values of Cu (I) sulfide minerals ranged from 0.14‰ to 2.69‰, suggesting that Cu predominantly originated from magmatic sources, whereas Cu (II) minerals such as chrysocolla, malachite and azurite presented much larger variations of δ<SUP>65</SUP>Cu values from −1.01‰ to 10.0‰. The small difference between the primary and secondary Cu sulfide minerals indicates an insignificant influence of Cu isotope fractionation processes during their formation, which may be explained by large mass transport and/or the involvement of biogenic activities. The δ<SUP>65</SUP>Cu values of primary chalcopyrite suggest source heterogeneity and/or the occurrence of isotope fractionation under a high-temperature environment. The positive Δ<SUB>Cu (II) mineral − Cu (I) mineral</SUB> values imply little transport of Cu in the deposit, with a rough mass balance and fast redox reaction.</P> <P>The δ<SUP>34</SUP>S values of the primary sulfide minerals (pyrite, molybdenite and chalcopyrite) clustered near 0‰, indicating that the sulfur is mainly derived from a homogeneous magmatic source. By contrast, the δ<SUP>34</SUP>S values of secondary Cu sulfide minerals ranged from −3.2‰ to −0.3‰, with an average of −1.6‰. The lower δ<SUP>34</SUP>S values are likely influenced by either S isotope fractionation processes or input of sulfur with different S isotope compositions during their formation.</P> <P>The measured δ<SUP>65</SUP>Cu and δ<SUP>34</SUP>S values of these ore minerals suggest a large mass transportation of Cu to an adjacent location, indicating little possibility of a hidden Cu occurrence in the Erdenetiin Ovoo deposit area.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We measured the δ<SUP>65</SUP>Cu and δ<SUP>34</SUP>S values of major ore minerals in the Erdenetiin Ovoo porphyry Cu-Mo deposit, northern Mongolia. </LI> <LI> We examined the Cu isotope fractionation processes among Cu minerals during their formation. </LI> <LI> We discussed the implication of Cu and S isotopic signatures on their sources and mineral exploration. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>