DSpace Collection:http://hdl.handle.net/123456789/4122024-03-29T14:22:47Z2024-03-29T14:22:47ZRelevant environmental aspects regarding the highlighting of anthropogenic pressures and the geochemical evaluation of the protected areasStanescu, BogdanGasnac, MarianCodreanu, Ana MariaCernica, GeorgianaCuciureanu, Adrianahttp://hdl.handle.net/123456789/18882022-10-06T07:42:21Z2022-01-01T00:00:00ZTitle: Relevant environmental aspects regarding the highlighting of anthropogenic pressures and the geochemical evaluation of the protected areas
Authors: Stanescu, Bogdan; Gasnac, Marian; Codreanu, Ana Maria; Cernica, Georgiana; Cuciureanu, Adriana
Abstract: The purpose of this article is to assess the quality of soil and water environmental factors in some protected areas in Romania both to establish geochemical threshold values and to highlight anthropogenic pressures where they have been identified. The activities carried out are defined spatially and temporally so that the results obtained include seasonal variations and other influencing factors that have variability on a temporal and spatial scale. Each protected area introduced in the study was well documented, and the particularities, the essential characteristics, the influencing factors, and those that can influence the quality of the environmental factors were presented. The developed conceptual model integrated all these elements for a better knowledge
of the study areas. The experiments aimed at taking soil and water samples from each analyzed site, then these samples were subjected to laboratory tests that included twenty parameters/quality indicators analyzed for each sample, and the values obtained were compared with those in the legislation in force. In the areas under the influence of anthropogenic activities, aspects of detail were highlighted, which mainly reveal a degradation of environmental factors. A general conclusion is related to the variability of the quality of environmental factors from one protected area to another, depending on the specifics, geological, geomorphological dowry, but also as a result of the manifestation of anthropogenic pressures.
Description: 22nd International Scientific Multidisciplinary Conference on Earth and Planetary Sciences SGEM 2022, 2-11 iulie 2022, Albena, Bulgaria2022-01-01T00:00:00ZNew HPLC Method for Surfactants Detection in Wastewaters SamplesPaun, IulianaChiriac, Florentina LauraPirvu, FlorinelaIancu, VasileCovaliu, Cristina Ileanahttp://hdl.handle.net/123456789/18752022-08-12T09:40:43Z2022-05-01T00:00:00ZTitle: New HPLC Method for Surfactants Detection in Wastewaters Samples
Authors: Paun, Iuliana; Chiriac, Florentina Laura; Pirvu, Florinela; Iancu, Vasile; Covaliu, Cristina Ileana
Abstract: Over the last decade, biocides have received increasing attention due to their widespread use, their transfer to aquatic ecosystems and their negative effect on aquatic organisms. Alkyl benzyl dimethyl ammonium chlorides are applied as bactericides and disinfectants in sanitary products and antistatic agents in the formula of laundry conditioners. The aim of this study was to provide a sensitive and robust HPLC-DAD method for detection of three biocides (dodecyl- (C12-), tetradecyl-(C14-), and hexadecyl- (C16-) benzyl dimethylammonium chloride) in wastewater samples. The an alytes separation was achieved using an Acclaim Surfactant Plus (3 µm, 150 mm × 3 mm) chroma tographic column, maintained at 30 °C. The isocratic mode elution using a binary phase of ammonium acetate 0,2 M (A): acetonitrile (B) as mobile phase (50:50, v/v) at a flow rate of 0.5 ml/min, allowed a run time of only 5 minutes. The linearity, accuracy and intermediate precision were vali dated. The HPLC-DAD method provides good linearity, with correlation coefficients from 0.9992 to 0.9997 in the concentration range from 1 to 100 mg/L. Very good precision values were obtained, with RSD% ranged from 1.37–2.27% for intra-day measurements and between 6.14 and 6.65% for inter-day measurements. The target biocides were isolated from wastewater samples through Solid Phase Extraction (SPE) procedure, using polymeric Strata-X Cartridges and acetonitrile and acetic acid (90%/10%) as elution solvent mixture. Recoveries (up to 86%) made possible the quantification biocides at very low levels, the limits of quantification (LOQs) being in the range of 4.5 and 7.6 µg/L. The method was successfully applied to wastewater samples, obtaining concentration values varying from few µg/L to few mg/L.
Description: The 1st International Electronic Conference on Processes: Processes System Innovation, vol. 69, 2022, https://doi.org/10.3390/xxxxx2022-05-01T00:00:00ZSubstantiation of halogenated by-products generation in the chlorination process of natural drinking water resources by analytical investigationCristea, IonutCosma, CristianaPatroescu, Viorel Ionhttp://hdl.handle.net/123456789/17532021-07-01T09:22:20Z2017-05-01T00:00:00ZTitle: Substantiation of halogenated by-products generation in the chlorination process of natural drinking water resources by analytical investigation
Authors: Cristea, Ionut; Cosma, Cristiana; Patroescu, Viorel Ion
Abstract: Chlorine, the most commonly used disinfectant for the drinking water treatment industry, has also an application for several other water treatment objectives, such as oxidation of iron, manganese, hydrogen sulfide, and ammonia, prevention of algal growth in sedimentation basins, maintenance of biological stability of drinking
water by prevention of bacteria regrowth in the distribution system. Natural organic matter (NOM) like humic substances present in water resources reacts with aqueous free chlorine or free bromine, halogenated by-products being formed. Only a small percentage of halogenated by-products has been regulated in
drinking water, most of them with adverse effects on human health: trihalomethanes (THMs) with MAC of 80/100 µg/L (US/EU regulations) and haloacetic acids (HAAs) with MAC of 60 µg/L (only US regulations).
The main indicator of the amount of halogenated by-product that could be expected to form in the distribution system if chlorine is applied in water treatment (oxidation/disinfection steps) is considered to be "disinfection by-products potential formation (DBPF)”. For evaluation/quantification of some halogenated by-products (THMs and HAAs) generated by the reactions between chlorine/bromine and NOM, performant analytical investigation methods are needed.
Description: International Conference “Sustainable Solutions in Water Management 2017”, ARA, 15-17.05.2017, Bucharest2017-05-01T00:00:00ZLichens-bioindicators of air qualityNeidoni, Dorian GabrielMasu, SmarandaPopa, Mariahttp://hdl.handle.net/123456789/17512021-07-01T08:34:04Z2017-05-01T00:00:00ZTitle: Lichens-bioindicators of air quality
Authors: Neidoni, Dorian Gabriel; Masu, Smaranda; Popa, Maria
Description: International Conference “Environmental Engineering and Sustainable Development”, UAB + BENA, 25-27.05.2017, Alba Iulia, Romania, Book of Abstracts, pp. 1212017-05-01T00:00:00Z