Allochthonous and autochthonous organic matter in natural waters: Kinetic and thermodynamic patterns of transformation and quantitative and qualitative compositions     

Lozovik  P. A.  Zobkova  M. V.  Ryzhakov  A. V.  Zobkov  M. B.  Efremova  T. A.  Sabylina  A. V.  Efremova  T. V. 《Doklady Earth Sciences》2017,477(2):1510-1514

Using adsorption of organic matter (OM) on diethylaminoethyl cellulose (DEAE-cellulose) in the dynamic mode, OM is divided into autochthonous and allochthonous. Based on the experiments on BOD kinetics and OM division into components, the kinetic parameters of autochthonous and allochthonous OM transformation are established for the first time (k_aut = 0.013, k_all = 0.0013 day^–1 at t =20°C). The activation parameters of transformation for autochthonous OM (ΔH^# = 75.6 kJ/mol, ΔS^# =–116.5 J/(mol K), and ΔG^# = 108.3 J/mol) and allochthonous OM (ΔH^# = 66.1 kJ/mol, ΔS^# =–149.1 J/(mol K), and ΔG^# = 108.0 J/mol) are calculated by the Arrhenius equation.

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Hydrochemical Characteristic of the Littoral Zone of Lake Onega     

A. V. Sabylina  A. V. Ryzhakov 《Water Resources》2018,45(2):213-221

The article presents the results of hydrochemical studies of two areas, open and closed, in the littoral zone of Lake Onega, carried out in 2013–2014. The results show that water of river and slope runoff, enriched with both biogenic elements and allochthonous organic matter, persist over a long time in spring in the littoral zone. In the summer, water chemistry at open shores is similar to that in lake pelagic zone, while the closed areas of littoral zone show the effect of biological processes. In the period of autumn homothermy, river and slope waters have no considerable effect on coastal water quality.  相似文献   

Water chemistry in Onega Lake and its tributaries     

A. V. Sabylina  P. A. Lozovik  M. B. Zobkov 《Water Resources》2010,37(6):842-853

The results of studies of water chemistry carried out in the water body in 1965–2009 are presented. This period features a considerable industrial and agricultural rise in the lake drainage basin, followed by a decline since the 1990s, manifesting themselves in the dynamics of some hydrochemical characteristics of water bodies. The multipurpose use of Onega Lake is shown to cause its pollution and eutrophication. The results of studies are used to evaluate the major components of the external load onto the lake and trends in variations of chemical characteristics under the effect of natural and anthropogenic factors.  相似文献