Method to determine chemical composition of slag materials
SUBSTANCE: invention relates to ferrous metallurgy and can be used to determine chemical composition of materials containing lump metal and used as raw material in cast iron production. The method involves separation of material into metal and slag fractions, measurement of metal fraction weight, grinding of slag fraction down to the fineness of 5 mm at most and determination of weight ratio of total ferrum and of necessary components in it by complete acid digestion, calculation of weight ratio of total ferrum and of components in the material, after grinding a sample is taken with the fineness of from 0.16 mm to 5 mm at most and chemical analysis is performed.
EFFECT: improved information value and reliability of analysis.
The invention relates to metallurgy, and in particular to determine the chemical composition of the slag materials. The technical result of the invention is the possibility to obtain the chemical composition of the slag material containing a lump of metal, and on the basis of the received data to accurately calculate the flow of charge materials for iron smelting.
This is ensured by the separation of material on the metal and slag components, measuring the mass of a metal component, the grinding of the slag component to a particle size of 5 mm and defining, through full acid digestion, mass fraction of total iron and the necessary components, the calculation of the mass fraction of total iron and components in the material.
The slag material containing lumps of metal are used as the iron containing additive in the production of cast iron. For averaging the composition of the sample before chemical analysis is chopping. However, to grind material containing large inclusions of metallic iron, to a grain size of less than 0.16 mm, it is impossible.
There is a method of sample preparation GOST 15054-80 "iron Ore, concentrates, agglomerates and pellets. Sampling methods and sample preparation for chemical analysis and determination of moisture content". This standard establishes a method of sample preparation for chemical analysis of the multiple stages of crushing, mixing, reduction, screening, grinding to a grain size of less than 0.16 mm and, respectively, the chemical analysis of the material with grain size less than 0,16 mm This standard does not describe how to deal with the remnants of the sample having a grain size of more than 0.16 mm after repeated grinding.
Closest to the claimed method is a method of preparation of metallurgical slag samples for chemical analysis, which includes several sequentially performed steps of grinding, mixing and splitting up to a certain weight. Before the first, second, third and fourth stages manually select metal inclusions. On the fourth, sixth and seventh stages of the selection of metallic impurities is carried out by screening on the screens between screening (see RF patent 2263151).
This method does not allow to obtain the chemical composition of the original sample, as selected metal inclusions do not participate in chemical analysis and not included in the final chemical composition of the sample.
The aim of the invention is the determination of the mass fraction of components in the slag material containing lumps of metal required for the calculation of the charge in the production of cast iron, the development of new technologies, conducting scientific research.
This goal is istihaada when using the method, involving separation of the sample on the metal and slag components by selecting manually a large metal pieces (scrap), sample reduction, shredding in several stages depending on the size of the sample, screening and selection manually metal particle size greater than 5 mm, grinding the remaining portion size more than 5 mm, the separation from her by screening of metal particle size greater than 5 mm, screening class a particle size less than 5 mm after each grinding and separation of the two particles is less than 0.16 mm and 0.16 mm to 5 mm, determination of the mass fraction of components in classes of size less than 0.16 mm and 0.16 mm to 5 mm by complete acid digestion of the sample, the calculation of the mass fraction of total iron and components in the original sample.
The method of determining the chemical composition of the slag material containing a lump of metal, includes 3 stages.
1. Determining the amount of metallic impurities
2. Determination of mass fraction of total iron and components
2.1 Determination of mass fraction of total iron and components in the material of size less than 0.16 mm
2.1.1 Determination of mass fraction of total iron is based on the reduction of iron (III) solution douglasthe tin in slabosolenaja environment to iron (II) is the titration of the final solution dvuhromovokislyj potassium in the presence of the indicator diphenylimidazole sodium.
2.1.2 Determination of the remaining components is performed according to the existing methods of quantitative chemical analysis.
2.2 Determination of mass fraction of total iron and components in material size from 0.16 mm to 5 mm
2.2.1. Part of the sample, prepared by p. 1.17, dissolve by heating in hydrochloric acid, if you do not want the definition of SiO2added ammonium fluoride for better digestion of the sample. After reducing the volume of the solution is cooled, transferred to a volumetric flask by decantation, avoiding getting stuck in the flask, aristorenas part of the sample. Washed pretorious part of the sample with water, collecting the washing water in the flask. The processes of dilution and decantation is carried out before until all the sample has dissolved. The solution is brought up to the mark and mix.
2.2.2 From the resulting solution is determined by the total iron. To do this, select the aliquot part of the solution and placed in a flask. Analysis method based on the reduction of iron (III) solution douglasthe tin to iron (II) and the titration of the final solution dvuhromovokislyj potassium in the presence of the indicator diphenylimidazole sodium.
2.2.3. From the solution obtained in paragraph 2.2.1, it is possible to identify other components.
3 calculation of the mass fraction of total iron and components in the slag material containing lumpy metal
3.1 Calculation of massovogo total iron
3.1.1 Mass fraction of total iron (Fetotal,%) is calculated by the formula:
where mFeRCDsthe amount of iron in the scrap, g;
mFecorthe amount of iron in the "Regulus", g;
mFe<0,16the amount of iron in the material of size less than 0.16 mm, g;
mFe0,16-5the amount of iron in the material size from 0.16 mm to 5 mm, g;
mCRthe sample mass, g
3.1.2 Amount of iron in the scrap (mFeRCDs, g) is calculated by the formula:
where 0,9 - correction factor taking into account the slagging scrap;
mRCDs.- weight of scrap, ,
3.1.3 the Amount of iron in the "Regulus" (mFecor, g) is calculated by the formula:
where 0,9 - correction factor taking into account the slagging "Wren" metal;
mcor(UAI)- mass "Wren" of metal in the sample, g;
mOSTis the mass of the remaining material after separation of the scrap, g;
mUAI- the mass of a sample obtained after reduction of the remaining material (scrap), ,
3.1.4 the Amount of iron in the material particles less than 0.16 mm (mFe<0,16, g) is calculated by the formula:
where k1- coefficient taking into account the content of iron in the material coarsely the ti less than 0.16 mm;
m<0,16- the mass of material of size less than 0.16 mm in the sample, ,
K1taking into account the content of iron in the material of size less than 0.16 mm, is determined by the formula:
where FeGeneral<0,16- mass fraction of total iron in the material of size less than 0.16 mm, obtained by chemical means, %.
The mass of material of size less than 0.16 mm in the original sample (m<0,16, g) is determined by the formula:
3.1.5 the Amount of iron in the material fractions from 0.16 mm to 5 mm (mFe 0,16-5, g) is calculated by the formula:
mFe 0,16-5=k2·(mCR-mFe TFR-mFe cor-m<0,16),
where k2- coefficient taking into account the content of iron in the material size from 0.16 mm to 5 mm
K2taking into account the content of iron in the material of size less than 0.16 mm, is determined by the formula:
where FeGeneral 0,16-5- mass fraction of total iron in the material size from 0.16 mm to 5 mm, obtained by chemical means, %.
3.2 Calculation of the mass fraction of components in the original sample
Mass fraction of components (X, %) is calculated by the formula:
where X'0,16-5- mass fraction of the component in the material size from 0.16 mm to 5 mm, obtained by chemical means, %,
where X'<0,16mA is Sova proportion of the component in the material of size less than 0.16 mm, obtained by chemical means, %.
The proposed method is publicly available, does not require complex and expensive laboratory equipment.
Distinctive features of the proposed method are:
- grinding samples for chemical analysis particle size up to 5 mm;
- decomposition of the sample material, uniform in grain composition, grain size from 0.16 mm to 5 mm;
- determination of the mass fraction of total iron and components in the material, taking into account neizlechimoj fraction more than 5 mm.
Sources of information
1. GOST 15054-80 "iron Ore concentrates. Agglomerates and pellets. Sampling methods and sample preparation for chemical analysis and determination of moisture content".
2. Patent 2263151. The method of preparation of metallurgical slag samples for chemical analysis. Publ. 27.10.2005 St,
The method of determining the chemical composition of the slag material containing a lump of metal, including the separation of material on the metal and slag components, measurement of the mass of a metal component, the grinding of the slag component to a particle size of not more than 5 mm and defining it through a full acid digestion mass fraction of total iron and the necessary components, the calculation of the mass fraction of total iron and components in the material, wherein after grinding away the sample size from 0.16 mm, is about less than 5 mm, and perform chemical analysis.
SUBSTANCE: invention refers to medicine and can be used for the prediction of the early stage of lymphocyte apoptosis. That is ensured by isolating cells, incubating for 48 hours at temperature 37°C with 5% CO2 with adding apoptosis inductor, dexamethasone in the concentration of 10-4 mole/ml. A lymphocyte viability is quantified by trypan blue inclusion, the recovered and oxidised glutathione concentrations are measured in lymphocyte lysate after the 30-minute pre-incubation with 2-vinylpyridine 10 mM. The early stage of lymphocyte apoptosis is stated, if observing an integrated decrease of the recovered glutathione concentration by 17% and more and an increase of the oxidised glutathione concentration by 19% and more as compared to the reference.
EFFECT: using the presented method in medical practice enables predicting the antioxidant state of the patient's body accompanying various diseases as shown by the early stage of lymphocyte apoptosis evaluated.
SUBSTANCE: method includes the selection and preparation of samples to be analysed, selection of specified volumes of solutions of a test system components, placement of the samples to be analysed and the test system components into a cuvette, registration of chemiluminiscence with further quantitative estimation of its value with taking into account the background signal of chemiluminiscence. The weight of porting of the sample of the material to be analysed is taken such that corresponds to the value of a specific surface 0.20±0.05 m2/g, and in case when it is not possible to determine the value of the specific surface of the sample to be tested, the weight of the taken portion is 0.010±0.005 g. The portion of the sample of the material to be analysed is placed into a cuvette with the further successive addition of the test system components: 0.01M solution of luminal in 0.5 NaOH solution and a solution of hydrogen peroxide of a 20-30% concentration to fill the working space in the cuvette, keeping the ratio luminal:hydrogen peroxide equal to 2:5. After that, values of chemiluminiscence are registered for 125 minutes and the total value of chemiluminiscence is calculated.
EFFECT: identification of the free-radical activity of solid materials by the method of the chemiluminiscence registration by means of the system of chemical reagents without the application of biological substrates in the test system.
3 tbl, 3 ex
FIELD: medicine, pharmaceutics.
SUBSTANCE: invention relates to method of estimating antioxidant activity of vegetable raw material from swamp cinquefoil (Comarum palustre L.). Method of estimating antioxidant activity of vegetable raw material from swamp cinquefoil (Comarum palustre L.) consists in determination of antioxidant activity in water tinctures of swamp cinquefoil by reduction of the level of free-radical oxidation, which is determined by the level of malonic dialdehyde (MDA) by method of interaction with thiobarbituric acid in model system of lipid peroxidation, represented by liposomes obtained from lecithin.
EFFECT: method reduces labour intensiveness of antioxidant activity determination and simplifies processing of obtained results, reduces cost of carrying out analysis, and increases determination accuracy.
SUBSTANCE: invention relates to the field of radiobiology and experimental medicine. A method of estimating pharmacological and toxicological properties of substances consist in the following: a substance to be analysed is introduced into a nutritional medium of larvae and flies of Drosophila melanogaster, combining in their genome hypomorphic mutations of ss- and CG5017-genes. The larvae and flies are irradiated with ionising rays with a dose of 1-10 roentgen. Viability, structures of extremities and a level of transcription of CG 1681, CYP6G1 and ss-genes are estimated. The obtained characteristics of the flies, grown on a medium, containing the analysed substance, and the flies, grown on a medium, which does not contain the analysed substance, irradiated and non-irradiated are compared, and pharmacological properties of the substance are determined by the results of comparison of viability, quantity of tarsal segments of extremity and the level of transcription of CG 1681, CYP6G1 and ss-genes in the flies of all formed groups.
EFFECT: method makes it possible to realise effective fast targeted selection and determine the properties of substances with toxicoperotective, radioprotective, toxicosensibilising and radiosensibilising properties.
7 dwg, 2 tbl, 2 ex
SUBSTANCE: method includes the selection of a totality of substances, for which the following procedures will be performed: monitoring of the region around a point source, determination of a route of sampling by the seasonal wind direction and drawing a map of isolines of pollutions on the basis of obtained data. A vector of the prevailing seasonal wind direction is selected. On the said vector sampling for each pollutant is carried out in two points r1 and r2, spaced from the point source at distances in the interval of 5 heights of a source (h) to 15 heights of the source. Coefficients B=ln(q1/q2·exp(C·((1/r2)-(1/r1))))/ln(r1/r2) and A=q1/(r1B)·exp(-C/r1), where q1 and q2 are concentrations of a pollutant in the points of sampling r1 and r2, C=30 h, are calculated. A single-dimensional profile of the pollutant concentration is calculated by the direction of the prevailing wind by formula F(R,A,B)=A·RB·exp(-C/R), where R is the current distance from the source, with transition to an area image of the pollutant distribution in the region being performed by multiplication of the specific concentration F(R,A,B) by a transposed function of the wind rose G(φ+180°), known from meteorological observations for the said region in the selected season.
EFFECT: method makes it possible to estimate a degree of pollution of the environment from the technogenic point source in a quick and accurate way.
3 dwg, 1 tbl, 1 ex
FIELD: measurement equipment.
SUBSTANCE: invention relates to the field of surface events and may be used in different fields, also for characterisation of disperse materials or crushed materials, sand, cement, etc. The method is characterised by the fact that the studied disperse material is placed into a template made in the form of a plate having free space in its centre, which is arranged in the centre of the limiting circumference applied on an easily replaced surface, or in a cuvette with available internal area, covered with a layer of water, which is exposed to the surfactant, they fix appearance of moving objects and calculate speed of their motion with subsequent calculation of speed of water movement along the surface of the disperse material.
EFFECT: method improvement.
6 ex, 1 tbl, 6 dwg
SUBSTANCE: energy value is determined based on the calculation of the activation energies of chemical components as the sum of the activation energies of the grain cover and core of white lupine, multiplied by the mass fraction of the cover and core in the grain, respectively. To calculate the activation energy the data of thermogravimetric and differential-thermal analysis are used, obtained in continuous heating of samples at a rate of 20 deg/min to thermal decomposition of the components of the grain cover and core.
EFFECT: invention enables to estimate fast and accurately the energy value of feed white lupine grains for feeding farm animals.
3 tbl, 8 ex
SUBSTANCE: invention refers to veterinary science and can be used for oestrus and ovulation monitoring in animals and planning of the preferential time of fertilisation. That is ensured by presenting a standing sensor placed in relation to an animal so that to detect the animal's standing position. That is followed by data collection from the standing position sensor, including the overall standing time data. The oestrus and ovulation time is determined by calculating the initial time of measurement and a peak on the basis of variations of the relation of the standing time. The preferential time of the animal's fertilisation is planned with using specifying the preferential time of fertilisation presented on a data detection device. The data detection device provides a convenient time zone of fertilisation and the preferential time of fertilisation within a time zone of ovulation. That is followed by presenting the data specifying the actual time of fertilisation. If observing a fertilisation failure, it is stated if the actual time of fertilisation that occurred in the above preferential time of fertilisation falls within the time zone of ovulation.
EFFECT: invention enables specifying the preferential time of the animal's fertilisation within the convenient time zone, as well as stating the animal's disease or weakness.
6 cl, 11 dwg
SUBSTANCE: to visually establish movement and determine the trajectory of formed objects in form of particles, the method of rendering self-organisation and movement of objects of dispersed particles employs a preparation object having a limiting closed line with a marked centre. A pattern, in which a dispersed material is placed, is then placed in the marked centre of the limiting circle. The liquid under analysis is then placed within the limiting circle in an amount which provides a layer of liquid over the material under analysis. A capillary containing a surfactant is then guided to the centre. A video camera is turned on to record surface changes. The capillary is lowered until it touches the surface. The video camera is turned off once the process of movement of self-organising objects is complete.
EFFECT: visual establishment of movement and determining the trajectory of formed objects in form of particles.
SUBSTANCE: system comprises an assembly of capacitance-type primary converters to measure electric capacity (dielectric capacitivity) and electric resistance (electrical conductivity) and temperature, which is placed at mobile equipment inside a settling tank, an assembly of secondary converters coupled to the primary ones and supplying the primary converters with action signals of the preset frequency and amplitude and the instantaneous response values of voltage and current at the primary converters for further processing, a programmable device or an automated workspace for control coupled to the secondary converters through a wired or wireless communications line with functions of data collection, processing and storage, including control over changes in the measured values of dielectric capacitivity and electrical conductivity with time or in regard to a structure of the settling tank, as well as issuing of the final forecast for a level or properties of sediment or sludge.
EFFECT: improving efficiency of automated control for waste water settling tanks.
12 cl, 1 dwg
FIELD: technologies for testing properties of materials.
SUBSTANCE: method for determining composition of bi-nonary condensed type systems, in case of core sizes in fractions d1>d2>d3>…>d9>d10 and in case of core dimensions relations d2/d1,d3/d2,…,d10/d9 greater than 0.155 fractions volumes are determined from formulas for binary systems V1=1m3, Y1=1-d2/d1, V2=1m3·Y1·Ve1,m3, for ternary systems Vsm2=1m3, Y2=1-d3/d2av, V3=1m3·Y2·Vemp,m3, for quaternary systems Vsm3=1m3, Y3=1-d4/d3av, V4=1m3·Y3·Vemp3,m3, for quinary systems Vsm4=1m3, Y4=1-d5/d4av, V5=1m3·Y4·Vemp4,m3, for senary systems Vsm5=1m3, Y5=1-d6/d5av, V6=1m3·Y5·Vemp5,m, for septenary systems Vsm6=1m3, Y6=1-d7/d6av, V7=1m3·Y6·Vemp6,m3, for octuple systems Vsm7=1m3, Y7=1-d8/d7av, V8=1m3·Y7·Vemp7,m3, for nonary systems Vsm8=1m3, Y8=1-d9/d8av, V9=1m3·Y8·Vemp8,m3, where V1,V2…,V9 - piled up fraction volume with core sizes respectively d1,d2,…,d9,m3,Vsm2,Vsm3,…,Vsm8 - piled up volume of binary, ternary,…,octuple friable condensed type system, m3, Y1,Y2,…,Y8 - coefficient of condensation level of fraction with core size d1 by fraction with core size d2, condensation of binary friable system with average core size d2av by fraction with core size d3,…, condensations of octuple friable systems with average core size d8av by fraction with core size d9, Ve1 - emptiness of fraction with core size d1, Vemt2, Vemt3,…,Vemt8 - emptiness value for binary, ternary,…, octuple friable condensed type system.
EFFECT: lower laboriousness, higher effectiveness, possible optimization by utilizing computer means.
11 ex, 1 tbl
FIELD: technologies for testing properties of materials.
SUBSTANCE: in method for determining compositions of friable bi-quinary systems of filled type with core sizes in fractions d1>d2>d3>d4>d5 and size relations of cores d2/d1,d3/d2,d4/d3,d5/d4 less than 0.155 fractions volume is determined for binary systems V1=1m3,V2=V1·Y1Ve1,m3,Y1=1-d2/d1, for ternary systems V1=1m3,V2=V1·Y1Ve1,m3,V3=V2·Y2Ve2,m3,Y1=1-d2/d1,Y2=1-d3/d2, for quaternary systems V1=1m3,V2=V1·Y1Ve1,m3,V3=V2·Y2Ve2,m3,V4=V3·Y3Ve3, m3,Y1=1-d2/d1,Y2=1-d3/d2,Y3=1-d4/d3, for quinary systems V1=1m3,V2=V1·Y1Ve1,m3, V3=V2·Y2Ve2,m3, V4=V3·Y3Ve3,m3,V5=V4·Y4Ve4, m3,Y1=1-d2/d1,Y2=1-d3/d2,Y3=1-d4/d3,Y4=1-d5/d4, where V1,V2,V3,V4,V5 - fraction volume with core size respectively d1,d2,d3,d4,d5,m3, Y1, Y2, Y3, Y4, - value of level of fill grade of empty space of fractions with greater core sizes by fractions with lesser core sizes, dimensionless quantity, limits of measurement of which are within range 0<Y≤1, Ve1, Ve2, Ve3, Ve4 - fraction emptiness value with core size respectively d1,d2,d3,d4 - dimensionless quantity.
EFFECT: higher efficiency.
10 ex, 2 tbl
FIELD: noble metal metallurgy, in particular method for gold content determination in natural solid organic materials such as divot, state coal, brown coal, and black coal.
SUBSTANCE: claimed method includes sampling the probe of starting material, grinding, mixing with massicot, smelting to form bullion, parting of gold-silver globule, weighting of gold sinterskin. Probe is sampled from starting natural solid organic material. Before smelting mixture is packaged in lead foil, established in full-hot scorifying dish, and padded with borax and table salt.
EFFECT: precise method for gold content determination in natural solid organic materials.
1 tbl, 1 ex
FIELD: medicine, gastroenterology.
SUBSTANCE: it has been suggested a new method to detect pharmacological sensitivity to preparations as acidosuppressors. After the intake of the preparation a patient should undergo fibrogastroduodenoscopy 3 h later, then, through endoscopic catheter one should introduce 0.3%-Congo red solution intragastrically and the test is considered to be positive at keeping red color that indicates good sensitivity to the given preparation, and in case of dark-blue or black color the test is considered to be negative that indicates resistance to this preparation. The suggested innovation widens the number of diagnostic techniques of mentioned indication.
EFFECT: higher efficiency of diagnostics.
FIELD: wood-working industry.
SUBSTANCE: method comprises measuring variations of pulse loading of the conical head during its penetration into the wood in radial direction. The wood quality can be judged by relative force pulse duration.
EFFECT: enhanced reliability.
4 cl, 9 dwg
FIELD: timber industry and may be used at through sequence certification of wood from growing trees to half-finished products in conditions of timber industry, logging, woodworking and also in engineering ecology and ecological wood-control at ecological valuation of territories.
SUBSTANCE: for testing they make with the help of a bore samples of cylindrical form of larger diameter then the largest transverse size of standard samples of rectangle form which are prepared from cylindrical samples and with the length of o less then the length of standard samples.
EFFECT: simplifies process of strengthening testing of wood with using cylindrical samples.
6 cl, 8 dwg
FIELD: measurement engineering.
SUBSTANCE: method is based upon introduction of preliminary prepared gas sample, ionization of components of sample and mass-spectral registration of ions. Ionization is completed by means of combination of glow discharge and electron impact when using ionizer which has to be assemblage made of high-melting capillary and thin-walled metal hollow cathode. Sample together with flow of microcavity discharge gas-suppressor is introduced into hollow cathode through capillary. Device is provided with electron gun mounted directly behind skimmer on the axis of supersonic gas jet. Hollow cathode is connected with capillary intended for introducing sample. Port of gas-discharge camera intends for introduction of ballast gas. There is ionizer inside the gas-discharge camera.
EFFECT: widened analytical abilities of gas mass-spectrometry.
7 cl, 3 dwg
FIELD: toxicology, in particular determination of water flea sensibility to toxic effect of water-soluble chemicals.
SUBSTANCE: claimed method includes detection of water flea death time (min) caused by water-soluble chemicals, wherein concentration (C, mol/l) of chemical under consideration fluctuates according to logarithmic scale with interval of 0.1. Plot of Y versus X is made, wherein Y-axis represents average death time with scale of 1 point = 1 min; X-axis represents reverse concentration (1/C) of chemical under consideration; and scale is proportional to log increasing by 0.1. Water flea sensibility to toxic effect (tgα) is calculated according to equation: tgα = TL(min):1/KL = TL(min)xKl (I), wherein α is inclination of straight line to X-axis; TL(min) is death time (min) being determined according to point of hypothetical crosspoint of straight line with Y-axis; KL is lethality constant (mol/l) defined as chemical concentration wherein water flea death time is equal to 2TL(min).
EFFECT: Method allowing evaluation of toxic effect evolution dynamics and comparison of toxic effect of water-soluble chemicals in equal concentration ranges.
2 tbl, 1 ex, 1 dwg
FIELD: medical engineering.
SUBSTANCE: test sample material has sintered polycrystalline hydroxyapatite having potassium to phosphorus content ratio within the limits of 1.50 to 1.67, apparent density being from 3 to 3.1 g/cm3 and the sample for testing tooth cream is manufactured as spatial body having test surface from sample material showing the above referenced properties. Test surface purity is of tenth precision class. The sample is manufactured as pill.
EFFECT: high reproducibility of test results.
FIELD: ecology, in particular, evaluation of atmospheric air quality by morphologic state of epiphytic lichens.
SUBSTANCE: method involves providing at least 10 test plots of 25x25 m size on land; determining outer features of lichens on trees; providing statistic processing of observation results; calculating bioindicator state factor and comparing with standard criteria of habitat state, with value of fractal size of lichen thallus being used as bioindicator activity factor, said value being determined by computer processing of scanned lichen thallus pictures; determining extent of atmosphere contamination by taking into account that fractal size of lichen thallus is reducing as extent of atmospheric air contamination in growing sites is increased.
EFFECT: simplified lichenoindication method, elimination of influence of subjective evaluation by investigator owing to usage of quantitative factor of lichen thallus state.
2 dwg, 1 tbl, 1 ex