Heavy Metal
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2021 ◽  
Vol 51 (1) ◽  
pp. 20210414
Author(s):  
Xiaoqing Cai ◽  
Ying Chen ◽  
Rao-ping Liao ◽  
Ze-xiang Wu ◽  
Chuang Yu ◽  
...  

Symmetry ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2292
Author(s):  
Veronica Anăstăsoaie ◽  
Cristian Omocea ◽  
Laura-Bianca Enache ◽  
Liana Anicăi ◽  
Eleonora-Mihaela Ungureanu ◽  
...  

Films of 2-(azulen-1-yldiazenyl)-5-phenyl-1,3,4-thiadiazole (T) were successfully deposited on glassy carbon surfaces to prepare chemically modified electrodes (CMEs). Their surface characterization was analyzed by electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM), and scanning electron microscopy (SEM). This complexing monomer has been deposited through direct electropolymerization in conditions established during the electrochemical characterization of T performed by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and rotating disk electrode voltammetry (RDE). These methods put in evidence the high degree of asymmetry of oxidation and reduction curves, which is due to the irreversible processes occurring at opposite potentials. The film formation was confirmed by ferrocene redox assay probe. The properties of the electrodes modified with T (T-CMEs) were investigated for sensing heavy metal (HM) ions in water solutions, with promising results for Pb(II) among Cd(II), Cu(II), and Hg(II) ions.


2021 ◽  
Vol 12 (4) ◽  
pp. 351
Author(s):  
V. R. Kairov ◽  
A. M. Gadzhiev ◽  
Z. T. Baeva ◽  
B. S. Nikkolova ◽  
M. K. Kozhokov ◽  
...  

2021 ◽  
Vol 12 (4) ◽  
pp. 356
Author(s):  
Z. T. Baeva ◽  
V. V. Tedtova ◽  
A. S. Dzhaboeva ◽  
V. R. Kairov ◽  
M. G. Kokaeva ◽  
...  

Author(s):  
Antonio De Agostini ◽  
Annalena Cogoni ◽  
Pierluigi Cortis ◽  
Andrea Vacca ◽  
José María Becerril ◽  
...  

2021 ◽  
Vol 51 (5) ◽  
pp. 83-90
Author(s):  
K. N. Narozhnykh

The problem of food contamination by heavy metals due to their accumulation in biosystems as a result of anthropogenic influences has been studied. The results of cadmium, lead, iron and manganese in cattle from the Novosibirsk Region and the Altai Territory are presented. The purpose of the study was to assess the impact of the ecological and geographical factor on the heavy metal content in the lungs of Hereford bulls. Lung samples were taken from 31 clinically healthy Hereford bulls aged 16-18 months. Sample preparation was carried out in accordance with GOST 26929-94 and 30178-96. The chemical composition of the samples was determined by atomic absorption spectrometry with flame and electrothermal atomization. The median values of the content of cadmium, lead, iron and manganese in the lungs of bull-calf were in the range of 0,01-0,12; 0,07-0,11; 70,9-89,1 and 0,3-0,4 mg/kg. The phenotypic variability of the level of iron and manganese was relatively low, while that of lead and cadmium was high. The dispersions of lead and cadmium levels in the animal groups studied were homogeneous, manganese and iron variants were heterogeneous. The influence of the ecological and geographical factor is characteristic only for cadmium levels. For manganese, iron, lead and cadmium the calculated reference ranges are: 0-1.12; 0-148.1 and 0-0.170 mg/kg respectively. They can serve as a guideline for Hereford cattle bred in the territories of Krasnozersky, Novosibirsky and Maslyaninsky districts of the Novosibirsk region and the Tselinny district of the Altai Territory.


Author(s):  
Tangjian Peng ◽  
Wanqing Liao ◽  
Guohua Gu ◽  
Guanzhou Qiu ◽  
Xueling Wu ◽  
...  

Author(s):  
Fawzi Irshaid

Disposal of poultry sludge is one of the great challenges facing cities because of very strict requirements for landfilling and the scarcity of space for landfills. The present study was therefore aimed at evaluating the physical and chemical properties of poultry sludge and its suitability for reuse in agricultural and non-agricultural applications. Three samples were collected from sludge at the wastewater treatment plant of Al-Thuraya slaughterhouse in Al-Mafraq District, Jordan. The physical and biochemical properties of these samples were analyzed. Also, elemental composition and heat value were determined. The results indicated that poultry sludge had a slightly alkaline pH and a total moisture content of 20%, as well as an average total solid of 80%. The dry solid sludge had a volatile solid content of 94.9% and 5.1% of ash. Also, dry sludge had a high protein content (62 %) followed by carbohydrate (20%) and fiber (17%), with fat being around 1%. The major elements in the sludge were carbon (65.5%) followed by nitrogen (16%), phosphorous (5 %) and sulfur (2%). Heavy metal concentrations in dry sludge ranged from 0.01 to 2 mg/kg. These heavy metal concentrations were well below the safe limits recommended by legislators for sludge used as a fertilizer. The findings from this study revealed that dry poultry sludge offers a wide range of potential uses as fertilizer, animal feed and a source of energy, and it should be considered as a potentially valuable and sustainable resource rather than a waste product.


2021 ◽  
pp. 112475
Author(s):  
Ali Hyder ◽  
Jamil A. Buledi ◽  
Muhammad Nawaz ◽  
Dhani B. Rajpar ◽  
Zia-ul-Hassan Shah ◽  
...  

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