Methods of Analyzing Qninones in Water and Their Application in Studying the Effects of Hydrophytes on Phenols. Part 1: Quinone Determination with Benzene Sulfinic Acid

By the example of some phenols and qninones, in aqueous solutions possibilities for the quantitative determination are tested separately and in the mixture. Methods for thin-layer chromatography and spectrophotometry were developed. There can be chromatographically deteeted between 5 and 80 μg of substance. Phenol and quinone concentrations of 1.5 · 10^?3 … 0.5 · 10^?4 M were spectrophotometrically investigated.     

Methods of Analyzing Quinones in Water and their Application in Studying the Effects of Hydrophytes on Phenols. Part 2: Polarographic Methods of Quinone Analysis

After an outline of the possibilities and difficulties connected with the polarographic determination of aqueous quinone solutions, a specified oscillo-polarographic method of investigation is described. By the examples of solutions of pure substances as well as of the industrial waters of a pulp mill (up to 2.3 mg/1 total quinone) the conditions for applying the technique developed art' explained. The relative error of this method does not exceed 3%     

Methods of Analyzing Quinones in Water and Their Application in Studying the Effects of Hydrophytes on Phenols. Part 3: Phenol Elimination under the Action of Aquatic Plants

In two test series, for which 10 and 2 … 4 g/1 wet matter of higher and lower aquatic plants from the lake Baikal and from the waters in the surroundings of Irkutsk were used, phenol solutions having concentrations of 10^?3 … 10^?5 M (1 … 5 mg/1) were applied. During the investigations the possible error clue to the presence of microorganisms was eliminated. The phenol decomposition by aquatic plants proceeds as a first-order reaction. The results of analyses are summarized in several tables and graphical representations.     

Variability of Trophic State of Bottom Biotopes of the Gorky Reservoir by Sedimentary Pigments

Water Resources - New data on the contents of plant pigments and organic matter in bottom sediments of channel, floodplain and estuarine biotopes of the Gorky Reservoir (upstream Volga, Russia) are...     

Methods of Analyzing Quinones in Water and Their Application in Studying the Effects of Hydrophytes on Phenols. Part 4: Accumulation of Exogenic Phenols,Localization of Endogenic Phenols and o-Diphenol Oxidase in Nitella Cells

By using Nitella, with the aid of a technique which is described in detail the uptake of resorcinol by the cytoplasm was demonstrated and quantitatively determined under different test conditions. In contrast to the phenol oxidation products of hydroquinone and pyrocatechol, the further “fate” of the resorcinol taken up by the cell substance is not yet fully clear. The rate of resorcinol absorption has been defined with a permeability constant.     

Plant Pigments in the Ivankovo Reservoir Silts as Indicators of Destruction Processes

The trophic state of the Ivankovo Reservoir is evaluated based on the characteristics of phytoplankton development and silt accumulation. Data on the space and time distribution of plant pigments in silt deposits are examined. Correlation between plant pigments and the main characteristics of silts are established. The ratio of chlorophyll content of the normal annual layer of sediment accumulation to the annual primary production of phytoplankton is calculated. The bedding of gray clayey silts onto gray sandy silts is shown to correlate with an increase in pigment concentrations in the top sediment horizons.     

俄罗斯贝加尔湖北部 Yoko-Dovyren 层状纯橄岩-橄长岩-辉长岩地块: 结构、成分以及作为矿物原材料的用途

Yoko-Dovyren层状纯橄岩-橄长岩-辉长岩地块位于西伯利亚克拉通南部的一处褶皱构造框架中(俄罗斯贝加尔湖地区北部)。该地块的结构在其厚度最大的中部得到了着重研究。剖面底部主体成分为斜长橄榄岩,并依据内部的堆晶成分变化从下往上可分为五个主要的地层序列:纯橄岩→橄长岩→橄榄辉长岩→橄榄辉长苏长岩→石英辉长苏长岩以及含易变辉石的辉长岩。该地块的矿化包括铜-镍矿化、低硫型富铂族元素(PGE)矿化以及铬铁矿化等。另外,该地块也含多种非金属矿物原材料,如硼矿化、透辉石、各种镁质硅酸盐岩等。它们也包括纯橄岩、异剥橄榄岩和橄长岩,并以较高的品质产出,有望采掘加工成为建筑材料(水泥、混凝土、沥青混凝土和建筑陶瓷)。综合利用矿物原材料可增加矿床价值,并有助于建设环保型采矿工作体系。     

Sedimentary Pigments as Production Characteristics of the Shallow Kostromskoe Widening of the Gorky Reservoir

Water Resources - First data on the concentrations of plant pigments in the top layer of bottom sediments are given for a large, shallow, moderately overgrown by macrophytes (21.5%) the Kostromskoe...     

Sediment pigments and silting rate as indicators of the trophic condition of the Rybinsk Reservoir

The results of studies of the vertical distribution of SP (the sum of chlorophill a and pheopigments) and the rate of silting of the Rybinsk Reservoir since its filling in 1941 up to 2009 are studied. The range of pigment concentrations (7–232 μg/g of dry residue) in core sample layers includes the values typical of all types of trophic conditions of water bodies, but the majority of values (81%) refers to the categories of mesotrophic and eutrophic. The mean concentrations of pigments in core samples over the periods between soil surveys, which were carried out in 1955, 1978, 1992, and 2009, averaged 525.4, 248.8, 200.6, and 142.3 mg/(m² year), respectively. The mean rates of silting at the stations under study decreased from survey to survey from 13.6–17.9 to 3.5–5.3 mm/year. A direct positive relation was found to exist between the mean annual concentrations of pigments in core samples and the rate of silting at higher values of the indices in lakelike reaches in comparison with river-type reaches.