scholarly journals HEAVY METALS CONTENT (Ba, La, Ce) IN THE SOILS OF CHEREPOVETS TECHNOGEACHEMICAL ANOMALY

2010 ◽  
pp. 58-64
Author(s):  
Yu. Vodianitsky ◽  
A. Savichev ◽  
O. Rogova
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Radiometric Method ◽  
Geochemical Anomaly ◽  
X Ray ◽  
Profile Distribution

With the help of X-ray radiometric method modified for diagnostics of superheavy metals Ba, La, Ce, their content in soils of Cherepovets geochemical anomaly is studied. Values Ultra-heavy metal technogeneities reach their maximum nearness of the Severstal mill. This is especially true for La and Ce, the share of whose technogenicity reaches up to 30-43%. This reflects the accumulative nature of the profile distribution of La and Ce, while in the background areas in humidal landscapes the distribution is eluvial.

scholarly journals Combined Influence of Low-Grade Metakaolins and Natural Zeolite on Compressive Strength and Heavy Metal Adsorption of Geopolymers

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 486
Author(s):  
Alcina Johnson Sudagar ◽  
Slávka Andrejkovičová ◽  
Fernando Rocha ◽  
Carla Patinha ◽  
Maria R. Soares ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Compressive Strength ◽  
Natural Zeolite ◽  
Metal Adsorption ◽  
Low Grade ◽  
Heavy Metal Adsorption ◽  
Adsorption Model ◽  
X Ray ◽  
Adsorption Capacities

Metakaolins (MKs) prepared from low-grade kaolins located in the Alvarães (A) and Barqueiros (B) regions of Portugal were used as the aluminosilicate source to compare their effect on the compressive strength and heavy metal adsorption of geopolymers. Natural zeolite, an inexpensive, efficient adsorbent, was used as an additive in formulations to enhance geopolymers’ adsorption capacities and reduce MK utilization’s environmental footprint. Geopolymers were synthesized with the replacement of MK by zeolite up to 75 wt.% (A25, B25—25% MK 75% zeolite; A50, B50—50% MK 50% zeolite; A75, B75—75% MK 25% zeolite; A100, B100—100% MK). The molar ratios of SiO2/Al2O3 and Na2O/Al2O3 were kept at 1 to reduce the sodium silicate and sodium hydroxide environmental impact. Geopolymers’ crystallography was identified using X-ray diffraction analysis. The surface morphology was observed by scanning electron microscopy to understand the effect of zeolite incorporation. Chemical analysis using X-ray fluorescence spectroscopy and energy dispersive X-ray spectroscopy yielded information about the geopolymers’ Si/Al ratio. Compressive strength values of geopolymers obtained after 1, 14, and 28 days of curing indicate high strengths of geopolymers with 100% MK (A100—15.4 MPa; B100—32.46 MPa). Therefore, zeolite did not aid in the improvement of the compressive strength of both MK-based geopolymers. The heavy metal (Cd2+, Cr3+, Cu2+, Pb2+, and Zn2+) adsorption tests exhibit relatively higher adsorption capacities of Barqueiros MK-based geopolymers for all the heavy metals except Cd2+. Moreover, zeolite positively influenced divalent cations’ adsorption on the geopolymers produced from Barqueiros MK as B75 exhibits the highest adsorption capacities, but such an influence is not observed for Alvarães MK-based geopolymers. The general trend of adsorption of the heavy metals of both MK-based geopolymers is Pb2+ > Cd2+ > Cu2+ > Zn2+ > Cr3+ when fitted by the Langmuir isotherm adsorption model. The MK and zeolite characteristics influence geopolymers’ structure, strength, and adsorption capacities.

X-ray fluorescence spectrometric determination of heavy metals in selected rice samples sold on the Liberian market: a case study conducted in Paynesville City, Greater Monrovia

2020 ◽  
Vol 9 (3) ◽  
pp. 1
Author(s):  
McClain James ◽  
PAYE Plenseh Diana ◽  
N’debewillie Kokolo ◽  
CHEA Sampson K. P. ◽  
Kiazolu J. Boima
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Cancer Risk ◽  
Hazard Index ◽  
Rice Sample ◽  
X Ray ◽  
Total Cancer Risk ◽  
Total Cancer ◽  
Rice Consumption ◽  
The Mean

Background: Environmental pollution with toxic heavy metals can be lead to the possible contamination of rice. Rice is a staple food widely consumed in the urban and rural parts of Liberia daily. Rice is cultivated in approximately 113 countries and a fundamental source for energy and protein. Objective: The study assesses selected heavy metals (As, Pb, Cd, Se, and Cr) concentration in selected imported rice and traditionally grown rice and bulgur wheat in Liberia. Methods: Six grade of imported rice, Bulgar wheat, and traditionally grown rice were purchased from the Duport Road and Red-Light markets in Greater Monrovia and analyze using X-ray Fluorescence Spectrometer. All data were analyzed using XLSTAT, and data was used to calculate the risk factor of each rice sample. Results: The mean concentration of heavy metal found in the rice as follow: As, 1.31ppm; Cd, 9.42ppm; Cr. 12.3ppm; Se, 5.73ppm; and Pb, 1.75ppm. The estimated daily intakes (EDIs) were calculated in combination with the rice consumption data. The mean intakes of As, Cd, Cr, Se, and Pb through rice were estimated to be 1.32, 9.42. 12.4. 5.74, and 1.75 mg/kg BW/day. Chromium has the average estimated daily intake. The combined hazard index for the heavy metals in each sample and the total cancer risk for each sample contributed most significantly to a cancer risk of rice consumption during adult life expectancy.Conclusion: The selected heavy metal concentration from the rice sample was above the FAO/WHO reference Standard but was within the range of the contaminant level except for chromium, which is above the accepted range. However, the hazard index and the total cancer risk indicate a potential non-carcinogenic and carcinogenic risk.  

scholarly journals Mobility of lead, zinc and cadmium in alluvial soils heavily polluted by smelting industry

2011 ◽  
Vol 51 (No, 7) ◽  
pp. 316-321 ◽  
Author(s):  
A. Vaněk ◽  
L. Borůvka ◽  
O. Drábek ◽  
M. Mihaljevič ◽  
M. Komárek
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Czech Republic ◽  
Extraction Procedure ◽  
Metal Mobility ◽  
Alluvial Soils ◽  
Mobility Factor ◽  
Heavy Metal Mobility ◽  
Profile Distribution ◽  
Lead Zinc

In order to determine the mobility of Pb, Zn and Cd in soils from the Př&iacute;bram region (Czech Republic) heavily contaminated by metallurgy, two profiles of alluvial soils were closely studied. Total contents of heavy metals were determined after digestion with a mixture of HF and HClO<sub>4</sub>. Heavy metal mobility was assessed using the mobility factor (MF) that represents the proportion of heavy metals present in the exchangeable and carbonate bound fraction based on the Tessier&rsquo;s sequential extraction procedure. The MF ranged from 2 to 46% for lead, 19 to 62% for zinc and 61 to 94% for cadmium. The profile distribution of zinc and cadmium showed a variable development with depth, which is caused by high amounts of these metals present in labile forms. The profile distribution of lead (the least mobile metal) is characterized by a gradual decrease with depth. The results indicate a higher contamination of the soil profile situated 2.5 km away from the smelter in comparison with the profile in its close vicinity. This fact confirms the existence of extreme fluvial contamination.

scholarly journals EXPERIMENTALLY INDUCED CHROMOSOME ABERRATIONS IN PLANTS

1957 ◽  
Vol 3 (3) ◽  
pp. 381-390 ◽  
Author(s):  
B. A. Kihlman ◽  
T. Merz ◽  
C. P. Swanson
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Complex Formation ◽  
Chromosome Aberrations ◽  
Potassium Cyanide ◽  
Oxygen Effect ◽  
Complexing Agents ◽  
X Rays ◽  
X Ray ◽  
Experimentally Induced

The discovery of Lilly and Thoday, that the presence of potassium cyanide (KCN) increases the production of chromosome aberrations by x-rays in anoxia, but has no effect on the production of chromosome aberrations by x-rays in air, was confirmed. In the presence of cyanide, the effect of a given dose of x-rays in nitrogen was found to be even greater than the effect of the same dose of x-rays in air. The cyanide effect on x-ray breakage in nitrogen was obtained at cyanide concentrations as low as 2 x 10–5 M. The breakage obtained after the combined x-ray-cyanide treatments was of the x-ray type, as evidenced by the distribution of breaks within and between the chromosomes. A number of other heavy metal complexing agents as well as some other compounds were tested for their ability to increase x-ray breakage in nitrogen and air. Of these compounds only cupferron proved to be effective. The results are discussed and it is concluded that the increased x-ray breakage in the presence of cyanide or cupferron cannot be due to an accumulation of peroxides. Instead it is suggested that the cyanide effect may be due to a complex formation between the active agents and heavy metals, presumably iron, within the chromosomes. The consequences of this hypothesis on the concept of the "oxygen effect," are discussed.

scholarly journals SEM-EDX Analysis of Heavy Metals in Anal Papillae of Hydropsyche Angustipennis Larvae (Trichoptera, Insecta) as a Support for Water Quality Assessment

2021 ◽  
Author(s):  
Mariusz Tszydel ◽  
Dagmara Błońska ◽  
Piotr Jóźwiak ◽  
Małgorzata Jóźwiak
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Water Quality Assessment ◽  
Tissue Samples ◽  
X Ray ◽  
Edx Analysis ◽  
Pollution Levels ◽  
Low Concentrations ◽  
Contaminated Streams ◽  
Anal Papillae

Abstract Anal papillae of caddisflies are peripheral organs responsible for osmoregulation and detoxification. Investigation of morphological abnormalities in the anal papillae of Hydropsyche angustipennis enriched with using SEM-EDX analysis (scanning electron microscopy-energy dispersive X-ray analysis), was used to assess heavy metal pollution levels in urban streams receiving surface runoff. Heavy metal ions not previously detected in water and tissue samples were detected using SEM-EDX method. Morphological irregularities were most frequently observed in larvae from the most contaminated streams. Heavy metals were almost 10 times more concentrated in darkened papillae than in pale, normal-shaped papillae. The present study confirms that SEM-EDX microscopy is an effective method as a support of standard heavy metal bioassays, especially if there is a necessity to detect trace elements in very low concentrations or incidental appearance of some ions in the water.

scholarly journals The Correlation Between Heavy Metal and Nutrient Content in Plecostomus (Pterygoplichthys pardalis) from Ciliwung River in Jakarta

2018 ◽  
Vol 10 (3) ◽  
pp. 597-604
Author(s):  
Dewi Elfidasari ◽  
Laksmi Nurul Ismi ◽  
Afina Putri Shabira ◽  
Irawan Sugoro
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Extraction Method ◽  
Nutrient Content ◽  
River Ecosystem ◽  
Fat Absorption ◽  
X Ray ◽  
New Information ◽  
Kjeldahl Method

Most of the rivers’ quality in Indonesia is in highly-polluted status including Ciliwung River in Jakarta. The pollution can affect river ecosystem especially the rivers biota such as plecostomus species that is mostly found in Ciliwung River. The information about correlation between heavy metal and nutrition content in Plecostomus flesh still limited, so the result from this research can give the new information about that. The aims of this research is identifying the effect of the heavy metals towards the contents of protein and fat of plecostomus flesh from Ciliwung River. The analyses methods use X-Ray Fluoresence (XRF) Spectrometer, the analysis of protein using kjeldahl method, and fat analysis using extraction method. The result of this research showed that small-sized plecostomus contained the highest fat and protein compared to medium-sized and big-sized plecostomus. The assumption was the contents of heavy metal which can impede protein and fat absorption. Meanwhile, the content of carbohydrate in small-sized plecostomus was the lowest. The identified type of heavy metal using XRF method was Pb, Hg and Cd with the concentration was higher than the maximum standard (SNI) so that the flesh of plecostomus from Ciliwung River in Jakarta is categorized unsuitable to consumption

scholarly journals Heavy metals in some moss species found around Camlihemsin district of Rize, Turkey

2017 ◽  
Vol 7 (1) ◽  
pp. 36-39
Author(s):  
Nilay Akcay ◽  
Nevzat Batan ◽  
Yunus Cinar
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Environmental Safety ◽  
Quantitative Information ◽  
Energy Dispersive ◽  
Moss Species ◽  
X Ray ◽  
Metal Levels ◽  
Surrounding Areas ◽  
Cu And Zn

Abstract In recent years, environmental safety associated with heavy metal levels of a tourism area and its surrounding areas has been one of the basic security for tourists health. Various methods have been used for measuring concentrations of heavy metal levels in these areas. Biomonitoring organisms such as mosses provide quantitative information on the quality of the environment around them, and they respond to pollution by altering their physiology or their ability to accumulate heavy metals. The aim of this study is to assess  the concentration of aluminum, manganese, iron, nickel, copper, and zinc levels in five different moss species collected around Camlihemsin district of Rize, by using Energy Dispersive X-ray Fluorescence (EDXRF) Spectrometry. The average concentrations of heavy metals in moss samples were found ranged from 3.8-8.3% for aluminum, 0.1-0.47% for manganese, 2.3-3.8% for iron, 38.8-74.2 ppm for nickel, 92.1-495.3 ppm for copper, 187.3-334 ppm for zinc. This study has shown that Abietinella abietina, Hypnum cupressiforme, Plagiomnium undulate, Rhytidium rugosum, and Thuidium tamariscinum samples were used to assess the potential contamination of Al, Mn, Fe, Ni, Cu, and Zn contamination in the region and made important contributions toward the understanding of Al, Mn, Fe, Ni, Cu, and Zn baseline data can be used for identification of changes in the levels of these heavy metals in the studied area. Keywords: Energy Dispersive X-ray Fluorescence (EDXRF) Spectrometry, heavy metals, moss, biomonitor, environment.  

scholarly journals Assessment of Heavy Metals in Beans (Vigna unguiculata) Obtained from Oja-Tuntun Market, Ile-Ife, Osun State, Nigeria

2020 ◽  
pp. 23-27
Author(s):  
K. T. Ogundele ◽  
O. W. Makinde ◽  
M. Eluyera ◽  
Y. C. Orisamoyi
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Food Safety ◽  
Human Exposure ◽  
Developing Nations ◽  
Limit Set ◽  
Human Diet ◽  
X Ray ◽  
Metal Levels ◽  
The World

Beans play a significant role in human diet especially in developing nations like Nigeria, the largest producer and consumer of beans in the world. To ensure food safety, heavy metal levels need to be monitored on regular basis to control human exposure through dietary intake. This study aimed at assessing the levels of heavy metals in some species of beans available in Ife market, Osun State, Nigeria. Samples of each species of beans were bought and analyzed for heavy metals using X-ray Fluorescence spectroscopy. Results showed that the concentration of heavy metals such as Cu was present at a level ranging from 0.131–0.205 ppm, and Zn was present at level ranging from 0.073–0.182 ppm. Cd was present at concentration < 0.039 ppm. Cu, Zn and Cd levels in natural beans sample were observably below maximum permissible limit set by WHO in Table 2. Therefore, it can be concluded that majority of these beans species were not contaminated with the studied heavy metals, hence pose no immediate health risk to human.

X-Ray Spectroscopic Localization of Selenium in Four Patients Having Heavy Metal Intoxication

1982 ◽  
Vol 40 ◽  
pp. 326-327
Author(s):  
James T. McMahon ◽  
Raymond R. Tubbs ◽  
Wilma F. Bergfeld
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Immune Complex ◽  
Spectroscopic Analysis ◽  
Inorganic Mercury ◽  
Proximal Tubules ◽  
X Ray ◽  
Immune Complex Glomerulonephritis ◽  
Heavy Metal Intoxication

Biopsies of four patients having various exposures to heavy metals were examined using SEM, TEM and X-ray microanalysis. Two patients having industrial exposure to inorganic mercury developed immune complex glomerulonephritis with a membranous distribution of IgG and C3. Within the proximal tubules of each patient were finely granular electron dense phagolysosomes. X-ray spectroscopic analysis of these inclusions demonstrated spectra characteristic of mercury and selenium.

Sign in / Sign up

Export Citation Format

Share Document