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Наука та прогрес транспорту. Вюник Дншропетровського нацюнального унiверситету залiзничного транспорту, 2018, № 4 (76)
UDC 656.2:504
A. V. SAMARSKA1*, Y. V. ZELENKO2
'*Dep. «Chemistry and Engineering Ecology», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipro, Ukraine, 49010, tel. +38 (097) 091 74 51, e-mail samarskaya.av@gmail.com, ORCID 0000-0002-0828-9457
2 Dep. «Chemistry and Engineering Ecology», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipro, Ukraine, 49010, tel. +38 (067) 774 04 64, e-mail j.v.zelenko@gmail.com, ORCID 0000-0001-5551-0305
ASSESSMENT OF THE RAILWAY INFLUENCE ON THE HEAVY METAL ACCUMULATION IN SOIL
Purpose. The scientific paper aims at analyzing the current state of the railway infrastructure soil contamination with heavy metals (HM), namely, the three stations of Prydniprovska railway: Kamianske-Pasazhyrske, Za-porizhzhia-Kamianske and Trytuzna. Methodology. The research object is the soil of the above mentioned railway stations, the research subject is the total content of HM. Sampling was carried out every 15 m between and outside both rails up to the end of railway ties. The total area of the investigated sites is 600 m2. The total form of Fe, Pb, Zn, Cu, Ni, Cd and Mn concentration was determined by the atomic absorption spectrometry method. The obtained data were compared with the background concentration of HM for Dnipropetrovsk oblast and the results of analyzing the reference control located at a distance of 250 m from the railway stations. Findings. It is found out that rail transport is a source of HM emission into soil. The findings indicate that the soil state of the Kamianske-Pasazhyrske station corresponds to a low ecological risk and a low degree of pollution, since the station is a passenger one only and pollution occurs mostly due to the friction of wheels and rails and that of the pantograph and overhead system, as well as the pesticide use. The soil contamination of the Zaporizhzhia-Kamianske station is characterized by a considerable potential environmental risk and a very high degree of pollution. This station is a cargo-passenger one, and this pollution level is mainly due to loading and unloading processes. The soil of the Trytuzna station is characterized by an average potential ecological risk and a moderate degree of pollution. Although this station is mainly used for the freight trains reformation, but due to the transportation of large volumes of bulk ore cargoes HM fall into soil. Besides, the station is not electrified. Recommendations for assessment of the soil pollution levels are given. Originality. For the first time the potential ecological risk of soil contamination was determined on the basis of the physical and chemical analysis of the HM content in the soil of the above-mentioned stations. Practical value. The results of the study can be used as a justification of the reasonability of introducing the environmental monitoring programs for the railway land, the environmental protection measures for the soil treatment from HM, correcting the railway exclusion zone, as well as protection of adjacent territories from the propagation and accumulation of the mentioned pollutants. The necessity and urgency of the constant control of the HM content in the railway soil and the relevance of the research continuation in this scientific direction are confirmed on the basis of the received data.
Keywords: heavy metals; railway transport; soil, railway stations, potential environmental risk
Introduction
Rail transport operation has a negative influence on the environmental quality. This influence can be seen in the environmental contamination with both organic (oil products, polycyclic aromatic hydrocarbons, polychlorinated biphenyls), and inorganic substances (heavy metals, SO2, CO, CO2, NO2, etc.).
Studies devoted to railway transport as a factor of environmental pollution confirm the hypothesis that this mode of transport can bring to soil such persistent and dangerous pollutants as heavy metals (hereinafter - HM) [1, 4-7, 10-14, 17-20].
HM concentration in soil samples taken in the
space between rails may exceed the benchmarks ten times. For example, the study of Polish scientists demonstrates the following HM concentration in the soil of the flawa Glowna railway junction, mg/kg: in the area of sidings Pb - 4481/4942; Cd -5,475,12; Cu - 19171612; Zn - 1264712232; Hg -0,573V0,9692; Fe - 448007397002; Co - 9V82; Cr - 67V582; Mo - 2722 0 - between rails, 2 - outside rails) [13]. The HM content indicators in three reference sites mg/kg: Pb - 1a/2b/3c; Cd -n.d.a/n.d.b/n.d.c; Cu - 4a/4b/4c; Zn - 23a/23b/18c; Hg - 0,014a/0,05b/0,013c; Fe - 4400a/4500b/5000c; Co - 1a/1b/2c; Cr - 5a/6b/8c; Mo - n.d.a/n.d.b/1c. n.d.
Наука та прогрес транспорту. Вюник Дншропетровського нацюнального унiверситету залiзничного транспорту, 2018, № 4 (76)
- not detected, a - 500 m southwest from the railway junction, b - 500 m to the southeast, c - 2 km to the east [13].
The obtained data demonstrate the significant content of iron, which is natural for railway transport, lead, cadmium, copper and zinc, which may indicate specificity of the cargoes transported, loaded and unloaded at this station.
Another study, conducted by Kajetan Dzierzan-owski and Stanislaw W. Gawronski also confirms the assumption that railway transport plays a significant part in the HM accumulation in soil and plants. The study was conducted in situ at the Warsaw-Otwock railway connection using the X-ray fluorescent spectrometer [11]. The authors compare the obtained results with the permissible levels of HM concentration in the surface layer for transport lands, mg/kg approved in Poland [11]. Table 1 presents the results of Kajetan Dzierzanowski and Stanislaw W. Gawronski' s investigation and the permissible levels of HM concentration in Poland, approved in 2002.
Table 1
HM concentration in surface layer of the Warsaw-Otwock railway ground and permissible levels of HM concentration
HM Concentration, mg/kg Standard deviation, mg/kg Permissible concentration levels of HM
Ba 1092.1 299.1 1000
Cr 1108.4 331.4 500
Zn 142.4 17.7 1000
Cu 894.3 41.5 600
Mn 1528.9 160.9 -
Mo 18.0 4.0 250
Ni 588.1 101.1 300
Pb 65.0 8.3 600
Hg 25.3 6.0 30
Fe 196112.7 3909.8 -
The presented data show the high content of such metals as barium, chromium, copper, nickel, mercury and iron typical of railways. It should be noted that it is difficult to assess the degree of the railway operation influence on the HM accumulation without comparing the obtained data with those at the referent sites or background concentration. It can only be
concluded that the approved standards for Ba, Cr, Cu and Ni have been exceeded.
However, the data on the HM accumulation in plants in the area adjacent to the Warsaw-Otwock railway junction is of greater interest. For example, Viola arvensis accumulates approximately 230 mg/kg Zn, Vicia cracca - ~ 30 mg/kg Mo, Ce-rastium dubium - ~ 160 mg/kg Cu, 400 mg/kg Mn, 8 mg/kg Pb, 34000 mg/kg Fe [11]. This, in turn, confirms the railway transport influence on the HM introduction and accumulation both in the soil of adjacent territories and in plants that grow there.
According to the results of chemical analysis of the soil samples from the Bialystok Fabryczny, Siemianowka and Walily railway stations in 2015 [20], the pollution levels appear to be much lower than in previous studies. However, the soil biotest-ing shows significant toxicity of the soil of the Bialystok Fabryczny and Siemianowka stations [20]. The information is given in Table 2.
Table 2
Results of chemical analysis of the soil samples from the Bialystok Fabryczny, Siemianowka and Walily railway stations
Station
HM Bialystok Fabryczny Siemianowka Walily
Zn 130 ± 10.4 75 ± 6.0 106 ± 8.58
Cu 107 ± 16.1 27 ± 4.1 46 ± 6.9
Pb 153 ± 27.5 20 ± 3.6 27 ± 4.9
Ni 14 ± 3.4 17 ± 4.1 52 ± 12.5
Hg 0.06 ± 0.01 <0.05 <0.05
Cd <0.70 <0.70 <0.70
Cr 25 ± 5.3 15 ± 3.2 70 ± 14.7
It is important the ■act that at present in Ukraine
there are no legally approved permissible levels of HM concentration for transport and communication lands, industry and urban territories.
As for the HM sources at railway transport, they are, in the first place, cargo transportation, its dispersing, scattering and spilling on the track and adjacent territories [1, 5-7, 10-14, 19]. For example, the total amount of losses during the transportation of mineral fertilizers in bulk in covered cars is up to 8%, in gondola cars up to 28%. When transported in multi-purpose cars annually up to
Наука та прогрес транспорту. Вюник Дншропетровського нацюнального ушверситету зашзничного транспорту, 2018, N° 4 (76)
7% of ore and 3% of cement are lost [7].
According to the State Statistics Service of Ukraine [3], the railway transport ranks first in terms of cargo transportation volumes. The Tables 3 and 4 show the cargo turnover, volumes of cargo transportation in 2017, and transportation of various types of cargo by rail in 2017, respectively. Other sources of HM at railway transport: - friction in systems: wheel-brake blocks, wheel-rail, pantograph-contact wire, bearings [5-7, 10-14, 18, 19];
- use of herbicides [7, 13];
- coal heating of cars [5-7];
- exhaust gases of locomotive engines [5-7, 10, 12];
- migration from wooden and ferro-concrete sleepers, from rubble and ballast section materials [5-8, 10, 14];
- garbage discarded from trains and on platforms.
Cargo turnover and volumes of cargo transportation in 2017
Cargo transportation in 2017
Performed, mln.t In % to 2016.
Transported cargoes 339.5 9S.9
dispatched 277.3 94.9
According to freight nomenclature
coal 43.9 76.2
coke 5.0 70.S
oil and petroleum products 3.S 115.3
iron ore and manganese ore 64.9 93.5
ferrous metals 20.S S2.4
ferrous scrap 3.1 114.9
timber cargo 2.S 66.S
chemical and mineral fertilizers 3.5 S4.2
grains and grinding products 35.7 111.S
cement 5.9 101.0
construction material 41.2 116.5
other cargoes 46.7 11S.0
Table 3
Cargo turnover Volume of transported cargoes
mln. tkm in % to 2016. mln.t in % up 2016.
Transport 343057.1 105.S 635.9 101.S
railway 191914.1 102.3 339.5 9S.9
automobile 4117S.S 10S.4 175.6 104.7
water 4257.1 106.3 5.9 SS.1
pipeline 105434.4 111.7 114.S 107.6
air 272.7 120.5 0.1 110.5
Table 4
Наука та прогрес транспорту. Вюник Дншропетровського нацюнального унiверситету залiзничного транспорту, 2018, № 4 (76)
Moreover, the HM accumulation in soil during the railway operation is influenced by a wide range of factors: intensity and speed of train movement; age of the railway and degree of its operation; initial braking speed, braking length; the nature and volumes of transported cargoes; weather conditions; relief; granulometric and chemical content of soil; vegetative cover.
Therefore, the HM content in the railway infrastructure soil can differ considerably and vary widely. Accordingly, the study of the railway transport influence on the HM emission into the soil is an important direction of scientific research.
Purpose
The main purpose of the article is analyzing the current state of the railway infrastructure soil contamination with HM; assessing and determining the rail transport share in the problem of the HM accumulation in soil.
In order to achieve the purpose, the following stages are realized: literary review of the problem; analytical assessment of soil contamination levels of railway stations with heavy metals; calculations of total contamination and potential environmental risks of soil contamination with HM; development of recommendations for further monitoring the toxicological state of soil.
Methodology
The research object is the soil of the three railway stations of Prydniprovska railway:
1) passenger station - Kamianske-Pasazhyrske, year of opening 1965, electrified (hereinafter -«KP» station);
2) freight-passenger station - Zaporizhzhia-Kamianske, year of opening 1884, electrified (hereinafter - «KZ» station);
3) freight station - Trytuzna, year of opening 1884, non-electrified (hereinafter station «T»).
The research subject is the total content of HM. Determining the total forms are enough for the space between tracks, since the moving ones play a minor role in this case, there is no migration in the «soil-plant» and «soil-plant-man» chains.
The sampling scheme is shown in Figure 1. Sampling was carried out every 15 m between (1) and outside both rails (2). The weight of each sample is 250-300 g, the depth of sampling is 0-20 cm. The total area of the investigated sites is 600 m2. The principle of the sampling choice is determined by the fact that the stations are surrounded by buildings and the HM distribution at different distances cannot be assessed.
The reference sites are at a distance 250 m from each station. The sampling was carried out using the «envelope» method.
Figure 2 shows the places of the soil sampling. It was carried out at the end of August 2017 in dry, hot weather.
The HM concentration in station soil was determined by the atomic-adsorption method. Total forms of HM were extracted with nitric acid (1:1). The HM content in the studied soil samples was calculated using the formula (1):
X = V ■ (C1 - C0)/m
where X - is the mass fraction of the i-th metal, determined in the air-dry soil sample, mg/kg; C1 -is the concentration of the i-th metal in the studied acid extract of soil, found according to the calibration graph, mg/dm3; C0 - is the concentration of the i-th metal in the control sample found according to the calibration graph, mg/dm3; V - is the volume of the investigated solution, cm3; m - is the weight of the air-dry soil sample, g.
Fig. 1. The scheme of sampling at railway stations 1 - the area of sampling between rails, 2 - the area of sampling outside both rails
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Fig. 2. The sampling sites at the station Kamianske-Pasazhyrske
In order to assess the level of the HM accumulation in soil, we calculated a total contamination index Zc, which reflects the complex influence of the whole group of elements and is determined as the additive sum of the excess of elements concentration coefficient above the background level using formula 2 [2] :
Z =
^ Kc - (n -1)
(2)
i=1
where n - is the number of elements under consideration, Kc - is the coefficient of concentration (accumulation), the ratio of actual concentration to background content [2].
Although this methodolgy is used in many works related to the assessment of HM accumulation in soil, the disadvantage of the Zc indicator is that it does not reflect the toxicity of each metal, therefore, it is advisable to use such an indicator as RI - potential environmental risk of soil contamination, which is determined by the formula 3 [9, 15, 16]:
R=Z Ei
where Ei - is a risk factor for the i -th HM,
Ei = Tf = Ti
C
S,
(3)
(4)
Table 5
Classification of the total soil contamination index Zc
Contamination degree Zc
very low < 8
low 8-16
moderate 16-32
high 32-64
very high 64-128
extremely high > 128
Table 6
Classification of potential ecological risk of soil contamination
where Ti - is the factor reflecting the toxicity of the i-th HM and the degree of environmental sensitivity to this metal, the values of Ti for Hg, Cd, As, Ni, Cu, Pb, Cr, Zn and Mn are 40, 30, 10, 5, 5, 5, 2, 1 and 1, respectively; fi - is the ratio of the actual concentration of HM, (Ci) to its background content (Si) [9, 15, 16]. Classifications of Zc and RI are presented in the Tables 5 and 6.
Ei Individual RI General
Ei <40 Low RI <150 Low
40<Ei<80 Average 150<RI<3 00 Average
80<Ei<160 Significant 300<RI <600 Significant
160<Ei<32 0 High RI>600 Very high
Ei>320 Extremely high
Findings
The research results are presented in Table 7. We determined the concentration of total forms of Mn, Cu, Zn, Ni, Pb, Cd, and Fe in the soil of «KP», «ZK», «T» stations and at the three refer-
Наука та прогрес транспорту. Вюник Дншропетровського нацюнального ушверситету зашзничного транспорту, 2018, N° 4 (76)
ence sites where the anthropogenic influence is quite insignificant.
The given data across the board exceed the reference indexes and the background concentration, which shows the direct railway transport influence on the HM accumulation in soil.
The obtained results indicate that the soil state of the «KP» station corresponds to a low ecological risk and a low degree of contamination, since it is a passenger station only and pollution occurs mostly due to the friction of wheels and rails, that of the pantograph and contact wire, as well as the herbicide use.
The soil contamination of the «ZK» station is characterized by a significant potential environmental risk and a very high degree of pollution. This station is a freight-passenger one and the pollution level is mainly due to the loading and unloading processes.
The soil of the «T» station is characterized by an average potential environmental risk and a moderate degree of pollution. Although this station is used for the freight trains reformation, but due to transporting large volumes of bulk ore cargoes HM fall into the station soil. Moreover, the station is not electrified.
Originality and practical value
For the first time the potential ecological risk of soil contamination was determined on the basis of the physical-chemical analysis of the HM content in the soil of the «KP», «ZK» and «T» stations. The obtained data prove the necessity and urgency of constant monitoring the HM content in the railway infrastructure soil.
The results of the study can be used as a justification of the reasonability of introducing the environmental monitoring programs for the railway lands, the environmental protection measures for the soil treatment from HM, protection of the territories adjacent to railway from the propagation and accumulation of the mentioned pollutants as well as correcting the railway exclusion zone
Conclusions
Taking into consideration the fact that the railway transport operation can lead to the significant level of the soil contamination with HM, which exceeds the regulatory one, it is necessary to develop recommendations for non-purpose (agricultural) use of land sites within the damping zone of railways.
According to the presented data, differentiating the railway mainline zones with high pollution indicators was carried out and the recommendations on the measures for decontamination and detoxification of the railway infrastructure soil were developed.
We recommend to calculate the Zc and RI indices for assessing the levels of soil contamination, as well as to determine the HM concentration at the reference sites, since the use of background concentration for comparison generates many questions and concerns, although it is used by many researchers. And as a final stage of assessment we suggest carrying out biotesting, which demonstrates the toxic influence (or its absence) of the investigated soil on plants, crustaceans, bacteria and other living organisms.
Table 7
General indicator of contamination and the potential ecological risk of stations soil pollution
Stations and
Heavy metal concentration, mg/kg
indicators according to the methodology Mn (600*) Cu (20*) Zn (30*) Ni (10*) Pb (10*) Cd (1*) Fe (22 000*)
1 2 1 2 1 2 1 2 1 2 1 2 1 2
«KP» 654 670 61 60 178 170 32 31 40 35 1.5 1.5 35 670 35 660
Кс 1.1 1.1 3.1 3.0 5.9 5.7 3.2 3.2 4.0 3,5 1.5 1.5 1,6 1.6
Ei 1.1 1.1 15.2 15 5.9 5.7 16 16 20 17.5 45 45 1.6 1.6
RI
103.35 - low potential ecological risk
14 - low contamination degree
Z
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Continuation of a table 7
General indicator of contamination and the potential ecological risk of stations soil pollution
Stations and indicators according to the methodology Heavy metal concentration, mg/kg
Mn (600*) Cu (20*) Zn (30*) Ni (10*) Pb (10*) Cd (1*) Fe (22 000*)
1 2 1 2 1 2 1 2 1 2 1 2 1 2
«ZK» 2220 2220 456 476 678 656 111 115 340 324 4 4 61 860 61 230
Kc 3.7 3.7 22.8 23.8 22.6 21.8 11.1 11.5 34 32.4 4 4 2.8 2.8
Ei 3.7 3.7 114 119 22.6 21.8 55.5 57.5 170 162 120 120 2.8 2.8
RI 487.7 - significant potential ecological risk
Zc 94.5 - very high contamination degree
«T» 710 715 75 67 180 179 63 65 150 130 2 2 48 700 48 705
Kc 1.18 1.19 3.75 3.35 6 6 6.3 6,5 15 13 2 2 2.2 2.2
Ei 1.18 1.19 18.8 16.8 6 6 31.5 32.5 75 65 60 60 2.2 2.2
RI 189.14 - average potential ecological risk
Zc 29.3 - moderate contamination degree
Reference sites 340'/2402/3003 6'/52/63 23'/302/403 7'/62/73 10'/82/53 0.5'/0.32/n.d.3 2340'/30 782/14603
* - background HM content in soil of Dnipropetrovsk oblast
1, 2, 3 - benchmarks of the HM content for the «KP», «ZK» and «T» stations, respectively.
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А. В. САМАРСЬКА1*, Ю. В. ЗЕЛЕНЬКО2
'*Каф. «XiMk та шженерна еколопя», Дтпропетровський нацюнальний ушверситет затзничного транспорту iMeHi ака-демжа В. Лазаряна, вул. Лазаряна, 2, Дншро, Украша, 49010, тел. +38 (097) 091 74 51, ел. пошта samarskaya.av@gmail.com, ORCID 0000-0002-0828-9457
2Каф. «Хiмiя та шженерна еколо™», Дтпропетровський нацюнальний ушверситет затзничного транспорту iменi ака-демжа В. Лазаряна, вул. Лазаряна, 2, Дшпро, Украша, 49010, тел. +38 (067) 774 04 64, ел. пошта j.v.zelenko@gmail.com, ORCID 0000-0001-5551-0305
ОЦ1НКА ВПЛИВУ ЗАЛ1ЗНИЧНОГО ТРАНСПОРТУ НА НАКОПИЧЕННЯ ВАЖКИХ МЕТАЛ1В У ГРУНТАХ
Мета. Наукова стаття мае за мету аналiз сучасного стану забруднення важкими металами (ВМ) грунпв залiзничноi шфраструктури, а саме трьох станцш Придшпровсько! залiзницi: Кам'янське-Пасажирське, Запорiжжя-Кам'янське й Тритузна. Методика. Об'ект дослвдження - грунти вищезазначених залiзничних станцш, предмет - валовий вмют ВМ. Вiдбiр проб здшснювався кожш 15 м мiж рейками та поза ними з обох сторш. Загальна площа дослщжуваних територш - 600 м2. Методом атомно-абсорбцiйноi спектрометри визначено концентраций валових форм Fe, Pb, Zn, Cu, Ni, Cd та Mn. Отримаш дат порiвнювались iз фоновими концентращями ВМ для Дшпропетровсько)! обласп та з результатами аналiзу контрольних дшянок, що знаходились на ввдсташ 250 м вщ залiзничних станцш. Результати. Встановлено, що залiзничний транспорт е джерелом надходження ВМ у грунти. Отримаш результати вказують на те, що стан грунпв станцп Кам'янське-Пасажирське ввдповвдае низькому еколопчному ризику й слабкому ступеню
Наука та прогрес транспорту. Вюник Дншропетровського нащонального ушверситету залiзничного транспорту, 2018, № 4 (76)
забруднення, оск1льки станщя е т1льки пасажирською, 1 забруднення вщбуваеться за рахунок тертя колю та рейок, пантографа об контактну мережу, а також використання пестицид1в. Забруднення грунпв станцп Запор1жжя-Кам'янське в1др1зняеться значним потенцшним еколопчним ризиком 1 дуже сильним ступенем забруднення. Ця станщя е вантажно-пасажирською, 1 такий р1вень забруднення е здебшьшого наслщком процес1в завантаження й розвантаження. Грунти станци Тритузна характеризуються середшм потенцшним еколопчним ризиком та пом1рним ступенем забруднення. На цш станци вщбуваеться переформування товарних по!зд1в, але за рахунок перевезення значних обсяпв сипучих рудних вантаж1в у грунти станцп потрапляють ВМ. Кр1м того, станщя неелектрифжована. Надано рекомендацп щодо ощнки р1вшв забруднення грунпв. Наукова новизна. Вперше на баз1 проведеного ф1зико-х1м1чного анал1зу вм1сту ВМ грунтах вищезазначених станцш визначено потенцшний еколопчний ризик забруднення грунпв. Практична значимкть. Результати дослвдження можуть бути використаш як обгрунтування доцшьносп впровадження програм еколопчного мониторингу для земель зал1зничного транспорту, природоохоронних заход1в 1з очищення грунпв ввд ВМ, коригування зони ввдчуження зал1зниць 1 захисту прилеглих територш ввд розповсюдження та акумуляцп цих полютанпв. На основ1 отриманих даних доведена необхвдшсть постшного контролю вмюту ВМ у грунтах зал1знично! шфраструктури й актуальшсть продовження дослщжень у даному науковому напрямку.
Ключовi слова: важк метали; зал1зничний транспорт; грунти; зал1зничш станци; потенцшний еколопч-ний ризик
А. В. САМАРСЬКА1*, Ю. В. ЗЕЛЕНЬКО2
'*Каф. «Химия и инженерная экология», Днепропетровский национальный университет железнодорожного транспорта имени академика В. Лазаряна, ул. Лазаряна, 2, Днипро, Украина, 49010, тел. +38 (097) 091 74 51, эл. почта samarskaya.av@gmail.com, ОЯСГО 0000-0002-0828-9457
2Каф. «Химия и инженерная экология», Днепропетровский национальный университет железнодорожного транспорта имени академика В. Лазаряна, ул. Лазаряна, 2, Днипро, Украина, 49010, тел. +38 (067) 774 04 64, эл. почта j.v.zelenko@gmail.com, ОЯСГО 0000-0001-5551-0305
ОЦЕНКА ВЛИЯНИЯ ЖЕЛЕЗНОДОРОЖНОГО ТРАНСПОРТА НА НАКОПЛЕНИЕ ТЯЖЕЛЫХ МЕТАЛЛОВ В ГРУНТАХ
Цель. Научная статья своей целью имеет анализ современного состояния загрязнения грунтов железнодорожной инфраструктуры тяжелыми металлами (ТМ), а именно трех станций Приднепровской железной дороги: Каменское-Пассажирское, Запорожье-Каменское и Тритузная. Методика. Объект исследования -грунты вышеупомянутых железнодорожных станций, предмет - валовое содержание ТМ. Отбор проб осуществлялся каждые 15 м между рельсами и за ними с обеих сторон. Общая площадь исследуемых территорий - 600 м2. Методом атомно-абсорбционной спектрометрии определены валовые концентрации Fe, РЬ, 2п, Си, №, Cd и Мп. Полученные данные сравнивались с фоновыми концентрациями ТМ для Днепропетровской области и результатами анализа контрольных участков, находящихся на расстоянии 250 м от железнодорожных станций. Результаты. Установлено, что железнодорожный транспорт является источником поступления ТМ в грунты. Полученные результаты указывают на то, что состояние грунтов станции Каменское-Пассажирское соответствует низкому экологическому риску и слабой степени загрязнения, поскольку станция является только пассажирской, и загрязнение происходит за счет трения колес и рельсов, пантографа о контактную сеть, а также использования пестицидов. Загрязнение грунтов станции Запорожье-Каменское отличается значительным потенциальным экологическим риском и очень сильной степенью загрязнения. Эта станция является грузопассажирской, и такой уровень загрязнения является в большей степени следствием процессов загрузки и разгрузки. Грунты станции Тритузная характеризуются средним потенциальным экологическим риском и умеренной степенью загрязнения. На этой станции происходит переформирование товарных поездов, но за счет перевозки значительных объемов сыпучих рудных грузов в грунты станции попадают ТМ. Кроме того, станция неэлектрифицирована. Даны рекомендации по оценке уровней загрязнения почв. Научная новизна. Впервые на основе проведенного физико-химического анализа содержания ТМ в грунтах вышеупомянутых станций определены потенциальные экологические риски загрязнения грунтов. Практическая значимость. Результаты исследования могут быть использованы в качестве обоснования целесообразности внедрения программ экологического мониторинга для земель железнодорожного транспорта, природоохранных мероприятий по очистке грунтов от ТМ, корректировки зоны от-
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чуждения железных дорог и защиты прилегающих территорий от распространения и аккумуляции этих пол-лютантов. На основе полученных данных доказана необходимость постоянного контроля содержания ТМ в грунтах железнодорожной инфраструктуры и актуальность продолжения исследований в данном научном направлении.
Ключевые слова: тяжелые металлы; железнодорожный транспорт; грунты; железнодорожные станции; потенциальный экологический риск
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Received: Apr. 26, 2018 Accepted: July 27, 2018
