Browsing by Author "Mladenov M."

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    ANALYTICAL DETERMINATION OF ORGANOCHLORINE PESTICIDES IN SOILS AND FOODS
    (2022-01-01) Yaneva S.; Mladenov M.
    Owing to the widespread use of organochlorine pesticides in the past, significant amounts of them still occur in nature, mainly in the form of byproducts, which, however, often present a greater risk than the primary product used. Danger comes mainly from their ability to accumulate along the food chain and because they can enter the human body in different ways – through inhalation, penetration through the skin, through ingestion, etc. The current study on the content of this group of pesticides and their metabolites in soil and meat samples is an up-to-date development to analyse the potential hazards for environment and people. Eight soil samples and three types of meat foods were tested for the content of organochlorides and their metabolites. The results presented show that although these substances were found in some of the samples, their concentrations were below the regulatory permissible values.
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    Characterization of olive meals
    (2020-01-01) Mladenov M.; Pashev A.; Gentscheva G.
    The current communication describes results of olive meals characterization. The chemical composition in respect to nutrients (N, P, K, Ca, Mg, C), some microelements and heavy metals (Al, Co, Cu, Fe, Zn, Ni, Cd, Mn, Mo, Pb, Cr, As, Se, and Sr) is studied. FAAS, ISP-MS and ATR-FTIR spectroscopy methods are used. Parameters as moisture and contents of volatile compounds, raw oil, raw fibres, raw proteins, ash residues and insoluble ash are also examined. Adequate conclusions and recommendations in respect to olive meals utilization are advanced on the ground of the results obtained.
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    Chemical composition of different types of compost
    (2018-01-01) Mladenov M.
    Composting is considered to be one of the most promising and effective solutions for achieving the minimization and recovery of municipal waste generated by large cities. In this connection, it is also one of the main directions of the collection systems in the contemporary management of the cities. The present communication reports results referring to the chemical composition of three types of compost prepared on the ground of different row materials. ``Home`` composting method is applied for producing two of the composts. The third one is produced in an industrial composting installation of a ``tunnel`` type. The content of nutrients (N, P, K, Ca, Mg, C, H, S), some microelements and heavy metals (Al, Co, Cu, Fe, Zn, Ni, Cd, Mn, Pb, Cr, As, Se, Sn, Bi, Sb) is determined. Parameters like pH, conductivity, bulk density, porosity and LOI are also examined.
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    Determination of the composition and contamination with heavy metals of soils from the srebarna lake reserve
    (2020-01-01) Mladenov M.; Yaneva S.
    The wetlands in direct contact with large rivers, such as the connection between Srebarna Lake and the Danube River, are particularly vulnerable to heavy metals. These metals can be a serious problem due to their toxicity, long persistence and bioaccumulation in the food chain, at the top of which in the wetlands are the waterfowl. For this reason, they are extremely susceptible to the accumulation and influence of heavy metals in their bodies and it is possible to come on to accumulation of significant concentrations, leading to negative effects for them. In this regard, subjects of study in this article are soils from the reserve area. Eight soil samples were tested for pH, electrical conductivity, nutrient content and heavy metals presence. The presented results show that the soils in the area have a relatively good stock in terms of carbon (humus), Ca, Mg, K and P, and although some heavy metals and metalloids have been found, their concentrations are below the permissible normatively established values.
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    Study on the physicochemical and chemical parameters of drinking and surface waters from mine area at village bov, balkan mountain, Bulgaria
    (2018-01-01) Mladenov M.; Karadjova I.; Gentscheva G.; Predoeva A.
    Water quality is influenced by natural local climate, geology and anthropogenic effects. In the present study, surface waters in hydrographic area, situated in mining region, in the vicinity of abandon copper mine, are characterized and their quality assessed from the view point of the requirements of European Water Frame Directive and Drinking Water Directive. Three sampling campaigns starting at 2012 from 16 sampling sites, in different seasons were performed in order to evaluate both natural, seasonal variations connected with water regimes and anthropogenic pressures. Chemical elements (Al, As, Ba, Cd, Cr, Co, Cu, Fe, Hg, Mn, Ni, Pb, Se, U, V, Zn and lanthanides) and physicochemical parameters (pH, conductivity, hardness, chemical oxygen demand (CODKMnO4); biological oxygen demand (BOD5); dissolved oxygen; dissolved solids; suspended matter; dry residue; chlorides; sulphates; nitrates; phosphates) were measured for characterization and evaluation of different water sources in the region. Conclusions for the further use of waters from this region as tap waters were presented and validated through the determination of much more chemical elements than these required from national legislation.
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    Validation of method for analysis of glucose in food additives
    (2023-03-10) Mladenov M.
    The dangers of consuming various food and drink products containing substances with a potential risk to human health are the subject of increased interest. There is a drive among manufacturers and the scientific community to ensure safety in the use of various foods and beverages with proven and/or suspected links to one or another disease state. Fast and reliable methods of analysis are increasingly sought for the purpose of establishing the type and concentrations of the contained substances and elements, which methods support the implementation of strict control of the quantitatively regulated levels of various indicators, including main components and impurities. The current work presents a validation procedure of an iodometric method for determining the content of glucose as the main component of three types of nutritional supplements. To evaluate the method, results for the analytical characteristics specificity, repeatability, accuracy and linearity are presented and analyzed.