Assessment of the ecological and geochemical conditions in surface sediments of the Varzob river, Tajikistan

Abdusamadzoda, Daler; Абдушукуров, Д. А.; Zinicovscaia, Inga; Duliu, Octavian G.; Vergel, Konstantin

doi:10.1016/j.microc.2020.105173

Cited by 18 publications

(13 citation statements)

References 18 publications

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“…The increased presence of Th and U indicates the existence of some enriched natural actinides deposits or ore occurrences located on the Sioma gorge in the vicinity of sampling point S8. These deposits could be either close to the surface or of high thickness, which is in good correlation with the previously reported data [7,13] concerning natural radioactivity along the Varzob River.…”

Section: Resultssupporting

confidence: 91%

“…Collected sediments of about 1 kg consisting of a silty greyish sand without visible vegetal debris were kept in clean polyethylene bags and transported to the Dushanbe laboratory. Here, the large fragments of rocks and pebbles were removed, and the remaining sedimentary material was air-dried until a constant weight, sieved through a 1 mm (18 mesh) sieve, and stored for future analysis [7,13].…”

Section: Samplingmentioning

confidence: 99%

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Geochemical and Isotope Anomalies in Sioma River Gorge, Western Tajikistan

et al. 2021

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For a better understanding of the previously observed increased natural radioactivity at the confluence of the Varzob and Sioma rivers, Central Tajikistan, the activity concentration of natural radioactive 40K, Th and U daughters as well as of the anthropogenic 137Cs were determined in nine locations covering the entire Sioma River. The radiometric determinations evidenced, in addition to increased activity concentrations of Th and U daughter radionuclides, an anomalous accumulation of anthropic 137Cs and natural 210Pb in the middle of the Sioma gorge. Complementarily, the mass fractions of natural Th and U determined by instrumental neutron activation analysis evidenced an increased presence of Th and U, which, in some places, overpasses six-times the average mass fraction found in the upper continental crust. The possible influence of active air transport from the southern Tadjik plane during the Afghani storms, as well as the presence of actinide-rich minerals, were analyzed and discussed.

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Section: Resultssupporting

confidence: 91%

Section: Samplingmentioning

confidence: 99%

Geochemical and Isotope Anomalies in Sioma River Gorge, Western Tajikistan

et al. 2021

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“…Mainly in terms, the anomaly zones were observed by contents of As, Sb, Hg and partly V, W and Zn. It should be noted that the geochemical features of this region cannot be ruled out [ 10 , 15 ]. At the same time, the upper reaches of the Fann Mountains and Mastchohi kuhi can be considered as clean zones.…”

Section: Discussionmentioning

confidence: 99%

“…To create a group, standard samples (GSS) were used for all mentioned CRMs, which were irradiated along with the analyzed samples. More detailed information on the calculation procedure is described in [ 7 , 10 ]. Overall uncertainties in determining of mentioned elements were no greater than 15%.…”

Section: Methodsmentioning

confidence: 99%

Assessment of the Toxic Metals Pollution of Soil and Sediment in Zarafshon Valley, Northwest Tajikistan (Part II)

Abdusamadzoda

Абдушукуров

Duliu

et al. 2020

Toxics

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This study discusses contamination of soils and sediments with trace elements such as Mn, Ba, W, V, Co, Cr, Zn, Ni, As, Sb Hg as well as Th and U, the influence of natural and anthropogenic factors on the distribution of elements and the ecological state of the Zarafshon Valley. The elemental composition of 116 soil and sediment samples were analyzed by the neutron activation analysis. The calculation of the geoaccumulation index (Igeo), contamination factor (CF) and pollution load index (PLI) showed that some places in the investigated region with developed the industrial zones (around mining and processing plants of “Anzob”, “Konchoch”, “Kumargi bolo” and “Mogiyon”) are mostly polluted by As, Sb, Hg, and in rare cases, the high concentration of W and V were determined. In addition, they were considered the distribution of radioactive elements–thorium and uranium and their ratio in the soil and sediments. Moreover, in the investigated area, strong anomalies of Th and U were not found. It turned out that the content of Th and U are local in nature and do not have a noticeable effect on the environment.

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“…The elemental mass fractions of fruits and soil samples were determined by the INAA and ENAA at the IBR—2 Fast Pulsed Reactor of the Joint Institute of Nuclear Research (JINR), Dubna. The procedure for sample irradiation was described in detail in [ 25 , 44 ]. The mass fractions of the elements based on short-lived radionuclides Ca, Cl, V, Ti, Mg, Al, Si, and Mn were determined by irradiation, 1 min for soil and 3 min for fruits, at a thermal neutron fluency debit of 1.6 · 10

.…”

Section: Materials and Methodsmentioning

confidence: 99%

Major and Trace Elements in Moldavian Orchard Soil and Fruits: Assessment of Anthropogenic Contamination

Zinicovscaia

Sturza

Duliu

et al. 2020

IJERPH

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The correct assessment of the presence of potentially contaminating elements in soil, as well as in fruits cultivated and harvested from the same places has major importance for both the environment and human health. To address this task, in the case of the Republic of Moldova where the fruit production has a significant contribution to the gross domestic product, the mass fractions of 37 elements (Na, Mg, Al, Ca, Si, K, Mn, Fe, Sc, Ti, V, Cr, Co, Ni, Zn, As, Br, Rb, Sr, Zr, Mo, Cd, Sb, Cs, Ba, La, Ce, Nd, Sm, Eu, Tb, Yb, Hf, Ta, W, Th, and U) were determined by instrumental neutron activation analysis in soil collected from four Moldavian orchards. In the case of three types of fruits, grapes, apples, and plums, all of them collected from the same places, only 22 elements (Na, Mg, Cl, K, Ca, Sc, Mn, Fe, Co, Ni, Cu, Zn, As, Br, Rb, Sr, Sb, Cs, Ba, La, Th, and U) were detected. The enrichment factor, contamination factor, geo-accumulation index, as well as pollution load index were calculated to assess the soil contamination. At the same time, the metal uptake from the soil into fruits was estimated by means of transfer factors. Soil samples showed for almost all elements mass fractions closer to the upper continental crust with the exception of a slightly increased content of As, Br, and Sb, but without overpassing the officially defined alarm thresholds. In the case of fruits, the hazard quotients for all elements with the exception of Sb in fruits collected in two orchards were below unity. A subsequent discriminant analysis allowed grouping all fruits according to their type and provenance.

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Assessment of the ecological and geochemical conditions in surface sediments of the Varzob river, Tajikistan

Cited by 18 publications

References 18 publications

Geochemical and Isotope Anomalies in Sioma River Gorge, Western Tajikistan

Geochemical and Isotope Anomalies in Sioma River Gorge, Western Tajikistan

Assessment of the Toxic Metals Pollution of Soil and Sediment in Zarafshon Valley, Northwest Tajikistan (Part II)

Major and Trace Elements in Moldavian Orchard Soil and Fruits: Assessment of Anthropogenic Contamination

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