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Mobility of humic substances, major and minor elements in lake Skjervatjern and its catchment area
AbstractWater and soil water samples from the humic lake experimental site in western Norway (HUMEX) were fractionated according to size by use of a cross flow ultrafiltration technique, and analysed for dissolved organic carbon (DOC), major ions, and several trace elements (e.g., Al, Fe, Mn, Zn, La, Sm, and Sc). Results from sampling seasons with different hydrological flow regimes are compared. Samples were taken both within the acid treatment site (A) and the control site (B). In the lake water samples, the relative importance of the low molecular weight fraction (L-Mw; Mw<3kDa) compared to the medium molecular weight fraction (M-Mw; 3kDao), Fe, and Mn was higher during a low flow period (LF) in July 1992 than in a medium flow period (MF) in June 1991. This difference was most distinct for the basin treated with acid (A). The LF period had higher ionic strength and lower concentration of DOC than the MF period. During a high flow period (HF) in October 1992, the transport of DOC and trace elements (Fe, Mn, La, and Sm) associated with a high molecular weight fraction (H-Mw; Mw > 10kDa) of DOC increased. In the lake, the major fraction of Alo was present as H-Mw forms, showing small differences in June 1991 (MF) and July 1992 (LF). There seemed to be an increased mobilization of Al in the form of inorganic Al species (Ali) in July 1992 (LF) compared to June 1991 (MF), especially in Basin A (lower DOC, increased concentration of SO42−. Ali was mainly at M-Mw and L-Mw forms. In the podzol profile, the relative importance of the L-Mw fraction seemed to increase with depth in June 1991 (MF) and July 1992 (LF), a size distribution pattern which also was observed in the dystric histosol in June 1991 (MF). This indicates that the vertical transport of L-Mw forms are higher than H-Mw forms.
Mobility of humic substances, major and minor elements in lake Skjervatjern and its catchment area
AbstractWater and soil water samples from the humic lake experimental site in western Norway (HUMEX) were fractionated according to size by use of a cross flow ultrafiltration technique, and analysed for dissolved organic carbon (DOC), major ions, and several trace elements (e.g., Al, Fe, Mn, Zn, La, Sm, and Sc). Results from sampling seasons with different hydrological flow regimes are compared. Samples were taken both within the acid treatment site (A) and the control site (B). In the lake water samples, the relative importance of the low molecular weight fraction (L-Mw; Mw<3kDa) compared to the medium molecular weight fraction (M-Mw; 3kDao), Fe, and Mn was higher during a low flow period (LF) in July 1992 than in a medium flow period (MF) in June 1991. This difference was most distinct for the basin treated with acid (A). The LF period had higher ionic strength and lower concentration of DOC than the MF period. During a high flow period (HF) in October 1992, the transport of DOC and trace elements (Fe, Mn, La, and Sm) associated with a high molecular weight fraction (H-Mw; Mw > 10kDa) of DOC increased. In the lake, the major fraction of Alo was present as H-Mw forms, showing small differences in June 1991 (MF) and July 1992 (LF). There seemed to be an increased mobilization of Al in the form of inorganic Al species (Ali) in July 1992 (LF) compared to June 1991 (MF), especially in Basin A (lower DOC, increased concentration of SO42−. Ali was mainly at M-Mw and L-Mw forms. In the podzol profile, the relative importance of the L-Mw fraction seemed to increase with depth in June 1991 (MF) and July 1992 (LF), a size distribution pattern which also was observed in the dystric histosol in June 1991 (MF). This indicates that the vertical transport of L-Mw forms are higher than H-Mw forms.
Mobility of humic substances, major and minor elements in lake Skjervatjern and its catchment area
Riise, Gunnhild (author) / Salbu, Brit (author) / Vogt, Rolf D. (author) / Ranneklev, Sissel B. (author) / Mykkelbost, Tone C. (author)
Environmental International ; 20 ; 287-298
1994-02-15
12 pages
Article (Journal)
Electronic Resource
English
Mobility of humic substances, major and minor elements in Lake Skjervatjern and its catchment area
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