Revista Colombiana de Quimica最新文献_第7页

Adsorción-desorción de diurón y ametrina en suelos de Colombia y España 敌草隆和灭蚁灵在哥伦比亚和西班牙土壤中的吸附-解吸

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Revista Colombiana de Quimica Pub Date : 2018-09-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N3.70402

Yetmy Rocío Peña Martínez, M. J. Martínez, Jairo Arturo Guerrero Dallos

{"title":"Adsorción-desorción de diurón y ametrina en suelos de Colombia y España","authors":"Yetmy Rocío Peña Martínez, M. J. Martínez, Jairo Arturo Guerrero Dallos","doi":"10.15446/REV.COLOMB.QUIM.V47N3.70402","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N3.70402","url":null,"abstract":"Aunque en la actualidad existe una gran preocupación por la contaminación y los posibles efectos sobre la salud que genera el uso frecuente de herbicidas, los estudios ambientales en los países tropicales son escasos, especialmente en Colombia. Por tanto, en el presente trabajo se evaluó la adsorción-desorción de diurón y ametrina en un suelo de Colombia (SC) y de España (SE). Los ensayos de adsorción-desorción se realizaron con moléculas de los herbicidas marcados con 14C, empleando la técnica batch equilibrium. En ambos suelos y para ambos herbicidas hubo un buen ajuste a las isotermas de Freundlich con R2 mayores a 0,99. Para diurón, en SE (Kfa = 12,82 ± 1,23) hubo mayor poder de adsorción frente a SC (4,56 ± 0,26). Por el contrario, para la ametrina se encontró un valor de Kfa = 6,47 ± 0,25 en SC y de 3,05 ± 0,08 en SE, mostrando mayor interacción con SC en comparación con SE. Para diurón se observó un grado de histéresis mayor en SC y para ametrina en SE, mostrando que la interacción de los dos herbicidas con los componentes de cada suelo es diferente dependiendo de su constitución mineralógica y su valor de pH. ","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46474771","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: 2

Electrochemical analysis of the corrosion inhibition properties of L-leucine and trypsin complex admixture on high carbon steel in 1 M H2SO4 solution l -亮氨酸-胰蛋白酶复合物在1 M H2SO4溶液中对高碳钢缓蚀性能的电化学分析

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Revista Colombiana de Quimica Pub Date : 2018-05-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N2.68058

R. Loto

{"title":"Electrochemical analysis of the corrosion inhibition properties of L-leucine and trypsin complex admixture on high carbon steel in 1 M H2SO4 solution","authors":"R. Loto","doi":"10.15446/REV.COLOMB.QUIM.V47N2.68058","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.68058","url":null,"abstract":"Corrosion inhibition of biodegradable chemical compounds (L-leucine and trypsin complex) on high carbon steel in 1 M H 2 SO 4 acid media was evaluated with potentiodynamic polarization technique, weight loss analysis, open circuit potential measurement, optical microscopy, and ATR-FTIR spectroscopy. Data obtained showed the mixture has a maximum inhibition efficiency of 82.4% and 90.08% from the electrochemical tests with mixed type inhibition properties. The addition of the mixture shifts significantly the corrosion potential of the steel to passivation values from open circuit potential measurement. Results from thermodynamic calculations indicated chemisorption adsorption mechanism according to Langmuir, Freundlich, and Frumkin isotherms coupled with correlation coefficients of 0.9994, 0.9651 and 0.8834. Statistical analysis showed exposure time to be the most significant variable responsible for corrosion inhibition. Identified functional groups of the compound from ATF-FTIR spectroscopy were adsorbed completely on the carbon steel surface from observation of the decreased peak intensity. Optical microscopy images of the inhibited and uninhibited steel surfaces contrast each other with due to the presence of macro-pits and porous oxide on the uninhibited steel.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"12-20"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.68058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47431916","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: 8

Adsorción de acetaminofén sobre carbones activados a diferente pH. Entalpía y entropía del proceso 对乙酰氨基酚在不同ph值和过程熵下对活性炭的吸附

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Revista Colombiana de Quimica Pub Date : 2018-05-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N2.68213

Valentina Fernández, Juan Carlos Moreno-Piraján, L. Giraldo

引用次数: 2

Structural, spectroscopic, and theoretical analysis of a molecular system based on 2-((2-(4-chlorophenylhydrazone)methyl)quinolone 基于2-((2-(4-氯苯腙)甲基)喹诺酮分子体系的结构、光谱和理论分析

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Revista Colombiana de Quimica Pub Date : 2018-05-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N2.67115

Manuel Noé Chaur Valencia, Elkin L. Romero, G. Gutierrez, M. S. Monsalve, Richard D´Vries, H. Zuluaga

引用次数: 3

Estudio metodológico sobre la medición de pH y conductividad eléctrica en muestras de compost 堆肥样品pH值和电导率测量的方法学研究

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Revista Colombiana de Quimica Pub Date : 2018-05-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N2.67338

F. Marrero, José Prato, Y. L. Cruz, Adriana Sánchez

{"title":"Estudio metodológico sobre la medición de pH y conductividad eléctrica en muestras de compost","authors":"F. Marrero, José Prato, Y. L. Cruz, Adriana Sánchez","doi":"10.15446/REV.COLOMB.QUIM.V47N2.67338","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.67338","url":null,"abstract":"The present paper describes the influence of compost/solvent relations on pH and electric conductivity (CE) measurements, using water and CaCl 2 0.01 M as extractants, in the extract suspension as well as in centrifuged supernatant. According to the results, pH CaCl2 seems to be more independent of extractant quantity, contrarily to aqueous extract measurements, which increases with dilution, described by a quadratic model. As a consequence, measurement must be performed where the curve slope is minimum or null, and where the measurement becomes independent of extractant quantity. For aqueous extract, it happens at relations compost/extractant greater than 1:8, and for CaCl 2 extracts, greater than 1:5. pH H2O is higher than pH CaCl2 showing that CaCl 2 is a better acidity extractant. EC measurements also show polynomical behavior, therefore must be performed on relations compost/extractant greater than 1:6, where EC values are more independent of extractant quantity. EC could be performed in CaCl 2 extract, suspension or supernatant, with respective blank correction.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"21-27"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.67338","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44177805","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: 5

Synthesis and characterization of mixed-ligand silver(I) saccharinate complex containing (2-(2-pyridyl)benzimidazole 含（2-（2-吡啶基）苯并咪唑的糖精酸银配合物的合成与表征

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Revista Colombiana de Quimica Pub Date : 2018-05-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N2.68225

Mario Ceroni Galloso, J. Angulo-Cornejo, Maria Nieves Lino-Pacaheco, C. Huerta, Enzo Martín Casimiro Soriano

引用次数: 2

Estudio del efecto fisiológico del consumo de arepas enriquecidas con pectina extraída de la cáscara de curuba (Passiflora tripartita var. mollissima) 食用姜黄（西番莲三方变种）壳中提取的富含果胶的珍珠的生理效应研究

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Revista Colombiana de Quimica Pub Date : 2018-05-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N2.65812

Blanca L. Ortiz Quintero, Cecilia Anzola Velasco

{"title":"Estudio del efecto fisiológico del consumo de arepas enriquecidas con pectina extraída de la cáscara de curuba (Passiflora tripartita var. mollissima)","authors":"Blanca L. Ortiz Quintero, Cecilia Anzola Velasco","doi":"10.15446/REV.COLOMB.QUIM.V47N2.65812","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.65812","url":null,"abstract":"The physiological effect of corn arepas consumption enriched with 10% ( w/w ) pectin extracted from banana passionfruit peel was evaluated on the serum levels of glucose and lipid in adult volunteers. The pectin was extracted with hydrochloric acid and precipitated with 96% ( v/v ) ethanol. Firstly, the volunteers consumed arepa without pectin for seven days; then, arepa with 10% of commercial citrus pectin for 20 days, and, finally, arepa with 10% banana passionfruit pectin for 20 days. At the same time, a sensory acceptance analysis was carried out. The results showed that, when consuming arepa with banana passionfruit pectin, serum glucose levels decreased significantly (5.88% (p = 0.023)), while the lipid profile was not affected. The arepa formulated with banana passionfruit pectin showed a higher percentage of soluble, insoluble and total of dietary fiber, as well as a lower percentage of available carbohydrates as compared to the other analyzed arepas. The sensory panel ruled low acceptance in flavor and texture for arepas with commercial citrus and banana passionfruit pectin. It was concluded that banana passionfruit pectin can be used for the formulation of arepas since it offers to consumers a beneficial food to reduce blood glucose levels.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"5-11"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.65812","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45925267","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: 2

Structural analysis of adsorption processes of 5FU and imiquimodon hydrogels using AMBER/PM3 hybrid model AMBER/PM3混合模型对5FU和咪喹莫特水凝胶吸附过程的结构分析

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Revista Colombiana de Quimica Pub Date : 2018-05-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N2.67352

N. Rangel-Vázquez, Dulce-Nallely Villanueva-García, J. Kalla

引用次数: 6

Electronic and electrochemical properties of grid-type metal ion complexes (Fe+2 and Co2+) with a pyridine-pyrimidine-pyridine based bis(hydrazone) 吡啶-嘧啶-吡啶基双（腙）与网格型金属离子配合物（Fe+2和Co2+）的电子和电化学性质

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Revista Colombiana de Quimica Pub Date : 2018-05-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N2.66081

Manuel Noé Chaur Valencia, Héctor Fabio Zuluaga Corrales, G. Martínez

{"title":"Electronic and electrochemical properties of grid-type metal ion complexes (Fe+2 and Co2+) with a pyridine-pyrimidine-pyridine based bis(hydrazone)","authors":"Manuel Noé Chaur Valencia, Héctor Fabio Zuluaga Corrales, G. Martínez","doi":"10.15446/REV.COLOMB.QUIM.V47N2.66081","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.66081","url":null,"abstract":"The synthesis of new grid-type complexes of Co 2+ and Fe 2+ based on a highly soluble double hydrazone framework is reported. The data obtained from 1 H NMR, FT-IR, and elemental analysis indicate that the complexes adopted a grid-like structure. Electronic properties of the metallogrids were analyzed by UV-Vis spectroscopy in chloroform, methanol, and dichloromethane. Additionally, cyclic voltammetry and square wave voltammetry were carried out in N,N -dimethylformamide (DMF). These compounds exhibited two oxidation processes corresponding to the organic ligand and several reductions events, comprising the ligand and metal centers. Furthermore, the interplay between the metal nature and the ligand framework was also studied in detail. These results represent an advancement in the chemistry of metallogrids not only because of the few reports concerning to the electrochemical properties found in the literature, but also for the design of novel hydrazone ligands of high solubility and easy preparation.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"45-53"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.66081","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49356305","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: 4

Decolorization of Reactive Black 5 Dye by Heterogeneous Photocatalysis with TiO2/UV TiO2/UV非均相光催化活性黑5染料的脱色研究

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Revista Colombiana de Quimica Pub Date : 2018-05-01 DOI: 10.15446/REV.COLOMB.QUIM.V47N2.67922

Ledys S. Copete-Pertuz, María Susana Pérez-Grisales, Marian Castrillón-Tobón, Guillermo Antonio Correa Londoño, Geovanna Tafurt García, Amanda Lucía Mora Martínez

{"title":"Decolorization of Reactive Black 5 Dye by Heterogeneous Photocatalysis with TiO2/UV","authors":"Ledys S. Copete-Pertuz, María Susana Pérez-Grisales, Marian Castrillón-Tobón, Guillermo Antonio Correa Londoño, Geovanna Tafurt García, Amanda Lucía Mora Martínez","doi":"10.15446/REV.COLOMB.QUIM.V47N2.67922","DOIUrl":"https://doi.org/10.15446/REV.COLOMB.QUIM.V47N2.67922","url":null,"abstract":"Reactive Black 5 (RB5) is an azo dye widely used in the textile industry because of its high chemical stability. Since it does not entirely fix on the fabrics, it pollutes water sources. In this work, the decolorization of aqueous solutions with RB5 was performed by heterogeneous photocatalysis with TiO 2 /UV. The reaction was carried out in an aluminum photoreactor equipped with five lamps. The effect of TiO 2 (0.1, 0.175, and 0.25 g L -1 ), RB5 concentration (50, 75, and 100 mg L -1 ), and pH (3, 7, and 11) was evaluated for 14 h, using a Box–Behnken experimental statistical design. Complete decolorization of RB5 was obtained at 14 h, employing 0.175 g L -1 TiO 2 , 50 mg L -1 RB5, and pH 3. A 98.44% of decolorization was achieved in 10 h (0.25 g L -1 of TiO 2 , 50 mg L -1 of RB5, and pH 7). The highest decolorization percentage of RB5 (99.51%) was obtained at 10 h of exposure to UV light, using 0.5 g L -1 of TiO 2 , 50 mg L -1 of the dye, and a pH of 3. Cytotoxicity tests on the HepG2 cell line indicated that photocatalytic degradation of RB5 did not generate cytotoxic byproducts.","PeriodicalId":43662,"journal":{"name":"Revista Colombiana de Quimica","volume":"47 1","pages":"36-44"},"PeriodicalIF":0.8,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15446/REV.COLOMB.QUIM.V47N2.67922","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42111422","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: 11