Romanian Journal of Ecology & Environmental Chemistry最新文献_第2页

Short investigation on occurrence and removal of semivolatiles during wastewater treatment processes 废水处理过程中半挥发物的发生和去除的简短研究

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-12-17 DOI: 10.21698/rjeec.2021.216

Maria Diana Puiu

引用次数: 0

Exposure assessment using biomonitoring 利用生物监测进行暴露评估

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-12-17 DOI: 10.21698/rjeec.2021.211

A. Cozea, G. Tanase, M. Neagu

{"title":"Exposure assessment using biomonitoring","authors":"A. Cozea, G. Tanase, M. Neagu","doi":"10.21698/rjeec.2021.211","DOIUrl":"https://doi.org/10.21698/rjeec.2021.211","url":null,"abstract":"Complex studies were performed combining macroscopic and biochemical analyzes of selected biomonitors, exposed in exposure systems outdoor with mixtures of pollutants as well as controlled exposure with certain concentrations of pollutants in fumigation chambers. In this study, the following plant species were used as bioindicators: Nicotiana tabacum, Petunia hybrida, Ricinus comunis, Trifolium pretense. The exposure plant samples were compared with control samples of biomonitors maintained under standardized conditions in the climate chamber. Classical methods of biochemistry combined with those of exposure biomonitoring have led to the completion of knowledge about the ways of action of plants to pollution. The analysis of some of the antioxidant compounds that are representing a structural class of chemicals (enzymes) with a wide range of biological functions, with the role of free radical inhibition, was performed. Many of the constituent compounds in certain cell types, also called active compounds, in this case, polyphenols are present in the body of some plant species. Polyphenol's presence in organisms, that are not usually present or are in normal quantities, is caused by stress, (pollution being a stress factor). Large amounts of polyphenols in plants are also given by the presence of pollutants in the environment. Through these extensive combined studies, it has been demonstrated that pollution can be a degenerative factor at the biochemical and physiological level, at the plant tissue level, with irreversible effects.","PeriodicalId":21370,"journal":{"name":"Romanian Journal of Ecology & Environmental Chemistry","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81476181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of toxic metal As on the Matricaria Chamomilla L. medicinal plant 有毒金属As对药用植物洋甘菊的影响

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-12-17 DOI: 10.21698/rjeec.2021.219

Ecaterina Anca Serban, G. Vasile, S. Gheorghe, C. Stoica, G. Catrina, C. Dinu

{"title":"The effect of toxic metal As on the Matricaria Chamomilla L. medicinal plant","authors":"Ecaterina Anca Serban, G. Vasile, S. Gheorghe, C. Stoica, G. Catrina, C. Dinu","doi":"10.21698/rjeec.2021.219","DOIUrl":"https://doi.org/10.21698/rjeec.2021.219","url":null,"abstract":"The paper presents an experimental laboratory study of the bioaccumulation of the toxic metal arsenic in the medicinal plant chamomile (Matricaria Chamomilla L.). The study makes a comparison regarding the bioaccumulation capacity of the chamomile plant in which arsenic is found as a unique contaminant, as well as in mixtures of 2, 3, or 4 toxic metals (Cd, Ni and Pb) on a natural soil enriched with metals, compared to the chamomile plant developed on an unpolluted substrate. The tests followed the effects of soil pollution with metals on the germination and development of chamomile. The experimental results indicated that arsenic does not bioaccumulate in the chamomile plant, remaining in the soil. The experiment that was an exception is the one with arsenic as the only contaminant (E1) in which at 90 days, the arsenic content in the chamomile plant was 3.58 mg/kg arsenic, the value that is within normal limits, below the phytotoxic value of 5 mg/kg, but was higher than that determined in the plant from the control test experiment (<0.75 mg/kg). The bioaccumulation factor (BCF) after 90 days, in all experiments, either by a combination of metals or a single contaminant had values lower than 1, indicating that the plant does not accumulate arsenic. The total chlorophyll from the results obtained indicates that the toxicity in the E1 experiment is higher than in the metal mixture.","PeriodicalId":21370,"journal":{"name":"Romanian Journal of Ecology & Environmental Chemistry","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87838957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Betula pendula Ssp. distribution and growth in the sub-Carpathian curvature 白桦喀尔巴阡以南曲率的分布和生长

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-12-17 DOI: 10.21698/rjeec.2021.202

Mihai Harpa, L. Dincă

{"title":"Betula pendula Ssp. distribution and growth in the sub-Carpathian curvature","authors":"Mihai Harpa, L. Dincă","doi":"10.21698/rjeec.2021.202","DOIUrl":"https://doi.org/10.21698/rjeec.2021.202","url":null,"abstract":"Birch ssp. in the sub-Carpathians curvature can be found in composition with beech and other resinous species, unevenly distributed from the mountain peaks at around 1200 m down to 500-600, mainly from high hills to depressions at 600m, rarely seen on plain sites, crossing different geomorphological structures and overall accounting for 3857.1 ha. The main objective of the paper was to analyze the site and stand characteristics of Betula pendula ssp. Roth. in the subCarpathians curvature as followed: stand structure, stand types and stand site types, soils and different metrics, from growth to yields and its connectivity.The ecological adaptability to climate and soil and early fast growth, makes silver birch fulfill the overall requirements as a pioneer species, mostly naturally regenerated. Birch distribution is highly influenced by stand structure having low proportion in compositions, mean height of 15 m at age 50, and a diameter of 20m. Regarding the site, characteristics are more commonly found on fertile soils, corrugated or fragmented site type with a slope of 20-50° and it is distributed as secondary species in stands, averaging 750m in attitude, ranging from 500 to 1200m, 90% being in mixtures with other species with a mean annual increment of approximately 7 m³/year/ha regardless of stand site type. As an early successional species, it serves as a first colonizer but secondary species and quite often as an ecological instrument to improve the soil characteristics, biodiversity and prevent landslides in certain sites, lacking economic value other than fuel wood or other non-wood products.","PeriodicalId":21370,"journal":{"name":"Romanian Journal of Ecology & Environmental Chemistry","volume":"252 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83494899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

pH-metric method determining the solubility and solubility products of slightly soluble salts of arbitrary composition 测定任意组成的微溶性盐的溶解度和溶解度产物的ph测定法

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-12-17 DOI: 10.21698/rjeec.2021.208

I. Povar, O. Spînu, B. Pintilie

{"title":"pH-metric method determining the solubility and solubility products of slightly soluble salts of arbitrary composition","authors":"I. Povar, O. Spînu, B. Pintilie","doi":"10.21698/rjeec.2021.208","DOIUrl":"https://doi.org/10.21698/rjeec.2021.208","url":null,"abstract":"The developed method of determining KS from pH metric data has a number of advantages compared to those used traditionally. First, in place of the residual concentrations of the salt components, only the pH value of the saturated solution is used in the derived expressions. Thus, the number of independent variables, which need to be measured experimentally, is reduced. Furthermore, the potentiometric method, used to determine the pH, is sufficiently accurate, simple and universal and does not necessitate the use of ion-selective electrodes. At the same time, the residual concentrations are usually measured by chemical methods, which are inferior in most cases, for several reasons, compared to the potentiometric method. Second, the KS value calculated by the developed method has a thermodynamic character. The organization of the experiment must be appropriate to the applied equations. Therefore, it is necessary to draw attention to the need for high accuracy in the process of preparing the initial solutions, because the initial concentrations of the precipitate components are included in the calculation formulas. The developed method for determining Ks can be applied for systems of any degree of complexity, which contain additional complexing agents.","PeriodicalId":21370,"journal":{"name":"Romanian Journal of Ecology & Environmental Chemistry","volume":"116 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72932898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

pH-metric method for determining the solubility and solubility products of slightly soluble hydroxides and acids 测定微溶性氢氧化物和酸的溶解度和溶解度产物的ph测定法

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-12-17 DOI: 10.21698/rjeec.2021.204

I. Povar, O. Spînu, B. Pintilie

{"title":"pH-metric method for determining the solubility and solubility products of slightly soluble hydroxides and acids","authors":"I. Povar, O. Spînu, B. Pintilie","doi":"10.21698/rjeec.2021.204","DOIUrl":"https://doi.org/10.21698/rjeec.2021.204","url":null,"abstract":"In this paper, original methods for determining such thermodynamic characteristics as solubility K S0 product (KS) or the activity product ( )of slightly soluble hydroxides and acids are communicated. Developed methods for determining KS and solubility S are based only on the pH values of the saturated aqueous solution for a known initial composition of the heterogeneous mixture and the equilibrium constants of an arbitrary set of possible side reactions in the aqueous natural systems. The determination of solubility S and solubility product KS is also possible in the presence of other hydroxides or acids of known concentrations. Deduced equations allow the calculation of such characteristics, as the equilibrium concentrations of the components of slightly soluble compounds in aqueous phase and the degree of precipitation γ of the solid phase for various initial concentrations of the components of the heterogeneous mixture which are known in the process of preparing the mixture, requiring only experimental pH values of a saturated solution. From the known experimental pH data, S and KS were calculated for a series of hydroxides and acids of arbitrary composition. The obtained results correlated well with the known tabular values. Analysis of a number of real systems illustrated the deduced expressions, including calculations and theoretical explanations.","PeriodicalId":21370,"journal":{"name":"Romanian Journal of Ecology & Environmental Chemistry","volume":"145 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80990570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stoichiometry of carbon, nitrogen and phosphorus in wastewater from Romania 罗马尼亚废水中碳、氮、磷的化学计量学研究

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-12-17 DOI: 10.21698/rjeec.2021.215

F. Pirvu, I. Paun, M. Niculescu, V. Iancu, L. Pascu, F. Chiriac

{"title":"Stoichiometry of carbon, nitrogen and phosphorus in wastewater from Romania","authors":"F. Pirvu, I. Paun, M. Niculescu, V. Iancu, L. Pascu, F. Chiriac","doi":"10.21698/rjeec.2021.215","DOIUrl":"https://doi.org/10.21698/rjeec.2021.215","url":null,"abstract":"Water resources crisis can lead to a new concept of wastewater treatment. Wastewater cannot be considered waste but can be a renewable or non-renewable energy source. Nutrients from wastewater could be recycled and not disposed of. A circular economy can be created that can be based on the ability of algae to absorb and store nutrients: carbon (C), nitrogen (N) and phosphorus (P). This study investigates the stoichiometry between carbon, nitrogen and phosphorus in wastewater from three geographical regions of Romania. The concentrations of inorganic nitrogen, total nitrogen, total phosphorus, and total organic carbon were compared and evaluated. Three wastewater sampling points located in different areas were monitored, in the period 2013-2017 for the sampling point located in the central-northern part of the Romanian Plain and in the period 2015-2017 for the other two studied areas. The obtained results showed very high values of total nitrogen concentrations with values between 28.2 mg/L and 107.2 mg/L for the southeastern part of Romania. The values of the stoichiometric ratio’s C/N, C/P, N/P have varied over time with maximums in the autumn and winter seasons which indicates the existence of significant contamination of wastewater. It may be possible in the future to improve the performance of wastewater treatment by adjusting C, N, and P parameters.","PeriodicalId":21370,"journal":{"name":"Romanian Journal of Ecology & Environmental Chemistry","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85214287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Environmental friendly flocculants for drinking water treatment 饮用水处理用环保型絮凝剂

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-06-25 DOI: 10.21698/rjeec.2021.106

M. Ștefănescu, L. Dinu, C. Bumbac

引用次数: 0

Experimental method for the assessment and characterization of hazardous waste for long-term storage 危险废物长期贮存评价和表征的实验方法

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-06-25 DOI: 10.21698/rjeec.2021.103

G. Catrina, B. Stanescu, A. Serbanescu, Georgiana Cernica, Lidia Kim

{"title":"Experimental method for the assessment and characterization of hazardous waste for long-term storage","authors":"G. Catrina, B. Stanescu, A. Serbanescu, Georgiana Cernica, Lidia Kim","doi":"10.21698/rjeec.2021.103","DOIUrl":"https://doi.org/10.21698/rjeec.2021.103","url":null,"abstract":"Long-term landfilling of hazardous waste should be a careful choice for any producer or generator of waste, as the behavior of the waste is different due to the physical-chemical conditions or following contact with other hazardous waste. In this study, the research undertaken was aimed at developing an experimental method for the assessment and characterization of hazardous waste for long-term storage. The method consists in the assessment of the behavior of heavy metals from waste, under different leaching conditions. To study various hazardous wastes, fly ash from the incineration of medical waste and slag from aluminum casting were chosen. Contact time, pH and redox potential are important parameters in the leaching process. The solubility of metals increases at pH values between 2 - 5 pH units and decreases at pH values between 6-12 pH units. The highest solubility of metals (As, Cr, Cu, Ni, Pb and Zn) in the tested waste was obtained after 48 hours at pH values between 2 - 5 pH units. Also, the values of the redox potential decrease almost linearly as the pH value increases. The developed method is a useful tool to assess the behavior of hazardous waste for long-term storage in landfills for this category of wastes.","PeriodicalId":21370,"journal":{"name":"Romanian Journal of Ecology & Environmental Chemistry","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85266069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Database with pollution sources and impact assessment in Bega and Timis River basins 贝加河和蒂米斯河流域污染源和影响评价数据库

Romanian Journal of Ecology & Environmental Chemistry Pub Date : 2021-06-25 DOI: 10.21698/rjeec.2021.104

D. Neidoni, V. Nicorescu, Ladislau Andres, S. Negrea, L. A. Diaconu

引用次数: 0