Chemistry Journal of Moldova

Ecological chemistry

DETERMINATION OF QUALITY INDICATORS OF PRUT RIVER WATER

Author(s):

Gheorghe Duca, Aliona Mereuta, Natalia Velisco, Claudiu Tanaselia, Tatiana Mitina


Field: Ecological chemistry
Type: Research paper
Issue: 2019 Volume 14, no.1
Pages: 61-67
Keywords: Prut River, heavy metal, quality indicator, water quality index.
Full Text (PDF): Download

DOI: http://dx.doi.org/10.19261/cjm.2018.541   

Abstract (PDF)
Graphical Abstract: This study presents an assessment of water quality of Prut River using the Water Quality Index (WQI), calculated according to the weighted arithmetic water quality index method. The obtained results show that the water of Prut River may be classified according to WQI as good water quality of grade B for sampling points Sculeni and Cislita-Prut villages, and very poor water quality of grade D collected in the sampling point Criva village.


 

Downloads: 31

SELF-PURIFICATION OF AQUATIC MEDIA FROM HEXACHLOROCYCLOHEXANE IN A RADICAL PROCESS

Author(s):

Serghei Travin, Gheorghe Duca, Viorica Gladchi


Field: Ecological chemistry
Type: Research paper
Issue: 2019 Volume 14, no.1
Pages: 47-53
Keywords: hexachlorocyclohexane, natural water, radical self-purification, kinetic characteristic.
Full Text (PDF): Download

DOI: http://dx.doi.org/10.19261/cjm.2018.537   

Abstract (PDF)
Graphical Abstract: This study presents an assessment of water quality of Prut River using the Water Quality Index (WQI), calculated according to the weighted arithmetic water quality index method. The obtained results show that the water of Prut River may be classified according to WQI as good water quality of grade B for sampling points Sculeni and Cislita-Prut villages, and very poor water quality of grade D collected in the sampling point Criva village.


 

Downloads: 26

ASSESSMENT AND MODELING OF HEAVY METAL POLLUTION OF SOIL WITHIN RECLAIMED AUTO REPAIR WORKSHOPS IN ORJI, IMO STATE NIGERIA

Author(s):

Chidi Edbert Duru


Field: Ecological chemistry
Type: Research paper
Issue: 2019 Volume 14, no.1
Pages: 54-60
Keywords: mechanic village, heavy metal, degree of contamination, index of geo-accumulation.
Full Text (PDF): Download

DOI: http://dx.doi.org/10.19261/cjm.2018.544

Abstract (PDF) 
Graphical Abstract: Toxic heavy metals within a reclaimed section of the Orji mechanic village in Nigeria were determined using X-ray fluorescence and atomic adsorption spectrophotometric methods. The data were analyzed using geo-statistical techniques. Results showed that the soil was strongly contaminated by lead, and extremely contaminated by cadmium at some of the sampling points. The activities at the mechanic village in this area significantly affected the accumulation of these heavy metals and immediate soil remediation has been recommended.


 


Downloads: 18

PLASMA-CHEMICAL SYNTHESIS OF SILVER NANOPARTICLES IN THE PRESENCE OF CITRATE

Author(s):

Margarita Skіba, Alexander Pivovarov, Anna Makarova, Victoria Vorobyova


Field: Ecological chemistry
Type: Research paper
Issue: 2018 Volume 13, no.1
Pages: 7-14
Keywords: nanoparticle, silver, stabilization, plasma, antibacterial.
Full Text (PDF): Download

DOI: http://dx.doi.org/10.19261/cjm.2018.475   
 
Abstract (PDF)
Graphical Abstract: The contact non-equilibrium low-temperature plasma technique is used to synthesize silver nanoparticles (AgNPs) employing trisodium citrate as capping agent. The AgNPs were characterized using UV-Vis spectroscopy, scanning electron microscopy, X-ray diffraction and zeta potential analysis. Additionally, the antibacterial properties of the synthesized AgNPs were assessed. 


 

Downloads: 77

IMPROVEMENT OF FILTRATION PROPERTIES OF GHIDIRIM DIATOMITE (REPUBLIC OF MOLDOVA)

Author(s):

Larisa Postolachi, Vasile Rusu, Tudor Lupascu, Oleg Petuhov


Field: Ecological chemistry
Type: Short communication
Issue: 2018 Volume 13, no.1
Pages: 117-121
Keywords: diatomite, alkaline treatment, filtration rate.
Full Text (PDF): Download

DOI: http://dx.doi.org/10.19261/cjm.2018.436

Abstract (PDF) 
Graphical Abstract: The aim of the study was to modify the diatomite from Ghidirim village (Ribnita distinct, Republic of Moldova) with purpose to use it as filter material. The initial diatomite was modified by alkaline treatment with sodium carbonate, and the filtering capacity was evaluated by suction filtration method. The treatment of diatomite by sodium carbonate resulted in an increased filtration rate, recording the most pronounced filtering capacity for diatomite treated with 20% solution of sodium carbonate.


 

Downloads: 44

ADSORPTION OF CADMIUM IONS FROM WATER ON DOUBLE-WALLED CARBON NANOTUBES/IRON OXIDE COMPOSITE

Author(s):

Karima Seffah, Amel Zafour-Hadj-Ziane, Abdelghani Tarek Achour, Jean-François Guillet, Pierre Lonchambon, Emmanuel Flahaut


Field: Ecological chemistry
Type: Research paper
Issue: 2017 Volume 12, no.2
Pages: 71-78
Keywords: double-walled carbon nanotubes, iron oxide, adsorption, cadmium ions.
Full Text (PDF): Download
 
DOI: http://dx.doi.org/10.19261/cjm.2017.412   

Abstract (PDF)
Graphical Abstract: A new material (DWCNT/iron oxide) for heavy metals removal was developed by combining the adsorption features of double-walled carbon nanotubes with the magnetic properties of iron oxides. Batch experiments were applied in order to evaluate adsorption capacity of the DWCNT/iron oxide composite for cadmium ions. The influence of operating parameters such as pH value, amount of adsorbent, initial adsorbate concentration and agitation speed was studied. The adsorption capacity of the DWCNT/iron oxide adsorbent for Cd2+ ions was 20.8 mg g-1, which is at the state of the art. The obtained results revealed that DWCNT/iron oxide composite is a very promising adsorbent for removal of Cd2+ ions from water under natural conditions. The advantage of the magnetic composite is that it can be used as adsorbent for contaminants in water and can be subsequently controlled and removed from the medium by a simple magnetic process.


 

Downloads: 65

THE IMPACT OF THE TREATMENT WITH CÂMPENI RED PETROLEUM ON A XVIII-TH CENTURY ICON

Author(s):

Cosmin-Tudor Iurcovschi, Marius Munteanu, Cristiana Manea (Amariei), Maria Modesta Lupașcu, Irina Crina Anca Sandu, Viorica Vasilache, Ion Sandu


Field: Ecological chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 53-60
Keywords: old icon, conservation state, preservation, restoration.
Full Text (PDF): Download

DOI: dx.doi.org/10.19261/cjm.2017.406
 
Abstract (PDF)
Graphical Abstract:
This paper presents the study regarding the impact of the treatment with Câmpeni red petroleum on an eighteenth-century icon made of wood, with the aim of active preservation and restoration. In accomplishing this endeavour, there were applied non-invasive techniques of analysis based on optical microscopy (OM), Scanning Electron Microscopy (SEM) coupled with Energy Dispersive X-ray analysis (EDX), micro-FTIR and colorimetry CIEL*a*b*. A series of chemical, physical-structural and mechanical characteristics of the wood were traced, in order to assess the degree of preservation enhancement as a result of the applied treatment.

Downloads: 113

NEW COMPOSITE SORBENTS FOR CAESIUM AND STRONTIUM IONS SORPTION

Author(s):

Mykola Kartel, Vita Galysh


Field: Ecological chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 37-44
Keywords: lignocellulose-inorganic sorbent, caesium ion, strontium ion, sorption efficiency, distribution coefficient.
Full Text (PDF): Download

DOI: dx.doi.org/10.19261/cjm.2017.401
 
Abstract (PDF)
Graphical Abstract: 
Composite lignocellulose-inorganic sorbents derived from plant residues of agriculture and food industry, modified with ferrocyanides of d-metals and hydrated antimony pentoxide were prepared. Caesium and strontium ions removal from water was tested by radiotracer method. Sorption of heavy metal ions, methylene blue, gelatin, vitamin B12 was also studied.

Downloads: 102

REMOVAL EFFICIENCY OF CONSTRUCTED WETLAND FOR TREATMENT OF AGRICULTURAL WASTEWATERS

Author(s):

Michal Šereš, Tereza Hnátková, Jan Vymazal, Tomáš Vaněk


Field: Ecological chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 45-52
Keywords: constructed wetland, agriculture wastewater, hybrid systems, horizontal filter, vertical filter.
Full Text (PDF): Download

DOI: dx.doi.org/10.19261/cjm.2017.403   
 
Abstract (PDF)
Graphical Abstract: 
This study describes performance of a hybrid constructed wetland (CW) for treating wastewater from small farm in Czech Republic. TheCW consisting of two horizontal filters, one vertical filter and three shallow pondsand reduced inflow values of 25.400 mg/L COD and 2.640 mg/L BOD5 by up to 99%.

Downloads: 80

EFFECT OF COPPER CONCENTRATION ON THE GROWTH OF METHYLOCOCCUS CAPSULATUS (STRAIN М)

Author(s):

Lidia Avdeeva, Rudolf Gvozdev


Field: Ecological chemistry
Type: Short communication
Issue: 2017 Volume 12, no.1
Pages: 110-114
Keywords: copper, biosorption, Methylococcus capsulatus, methanobactin.
Full Text (PDF): Download

DOI: dx.doi.org/10.19261/cjm.2017.404  
 
Abstract (PDF)
Graphical Abstract: Growth of Methylococcus capsulatus (M) under different copper content in the growth medium has been studied. Excess of copper is sorbed in cytoplasm and on the cell surface. Growth of M. capsulatus (М) under copper-limited and copper-excess growth conditions is accompanied by increase of methanobactin secretion into the growth medium.

Downloads: 49