scholarly journals Chemodynamics of Methyl Parathion and Ethyl Parathion: Adsorption Models for Sustainable Agriculture

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Noshabah Tabassum ◽  
Uzaira Rafique ◽  
Khaled S. Balkhair ◽  
Muhammad Aqeel Ashraf
Keyword(s):  
Sustainable Agriculture ◽  
Methyl Parathion ◽  
Residual Concentration ◽  
Adsorption Models ◽  
Pesticide Transport ◽  
Barren Soil ◽  
Batch Condition ◽  
The Subject ◽  
Uv Visible ◽  
Efficient Adsorbent

The toxicity of organophosphate insecticides for nontarget organism has been the subject of extensive research for sustainable agriculture. Pakistan has banned the use of methyl/ethyl parathions, but they are still illegally used. The present study is an attempt to estimate the residual concentration and to suggest remedial solution of adsorption by different types of soils collected and characterized for physicochemical parameters. Sorption of pesticides in soil or other porous media is an important process regulating pesticide transport and degradation. The percentage removal of methyl parathion and ethyl parathion was determined through UV-Visible spectrophotometer at 276 nm and 277 nm, respectively. The results indicate that agricultural soil as compared to barren soil is more efficient adsorbent for both insecticides, at optimum batch condition of pH 7. The equilibrium between adsorbate and adsorbent was attained in 12 hours. Methyl parathion is removed more efficiently (by seven orders of magnitude) than ethyl parathion. It may be attributed to more available binding sites and less steric hindrance of methyl parathion. Adsorption kinetics indicates that a good correlation exists between distribution coefficient (Kd) and soil organic carbon. A general increase in Kd is noted with increase in induced concentration due to the formation of bound or aged residue.

Liquid-liquid extraction of succinate using a dicopper cryptate

2020 ◽  
Author(s):  
Riccardo Mobili ◽  
Sonia La Cognata ◽  
Francesca Merlo ◽  
Andrea Speltini ◽  
Massimo Boiocchi ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Visible Spectrum ◽  
Tca Cycle ◽  
Residual Concentration ◽  
Waste Products ◽  
Liquid Liquid Extraction ◽  
The Tca Cycle ◽  
Quantitative Extraction ◽  
Uv Visible

<div> <p>The extraction of the succinate dianion from a neutral aqueous solution into dichloromethane is obtained using a lipophilic cage-like dicopper(II) complex as the extractant. The quantitative extraction exploits the high affinity of the succinate anion for the cavity of the azacryptate. The anion is effectively transferred from the aqueous phase, buffered at pH 7 with HEPES, into dichloromethane. A 1:1 extractant:anion adduct is obtained. Extraction can be easily monitored by following changes in the UV-visible spectrum of the dicopper complex in dichloromethane, and by measuring the residual concentration of succinate in the aqueous phase by HPLC−UV. Considering i) the relevance of polycarboxylates in biochemistry, as e.g. normal intermediates of the TCA cycle, ii) the relevance of dicarboxylates in the environmental field, as e.g. waste products of industrial processes, and iii) the recently discovered role of succinate and other dicarboxylates in pathophysiological processes including cancer, our results open new perspectives for research in all contexts where selective recognition, trapping and extraction of polycarboxylates is required. </p> </div>

scholarly journals Liquid-liquid extraction of succinate using a dicopper cryptate

2020 ◽  
Author(s):  
Riccardo Mobili ◽  
Sonia La Cognata ◽  
Francesca Merlo ◽  
Andrea Speltini ◽  
Massimo Boiocchi ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Visible Spectrum ◽  
Tca Cycle ◽  
Residual Concentration ◽  
Waste Products ◽  
Liquid Liquid Extraction ◽  
The Tca Cycle ◽  
Quantitative Extraction ◽  
Uv Visible

<div> <p>The extraction of the succinate dianion from a neutral aqueous solution into dichloromethane is obtained using a lipophilic cage-like dicopper(II) complex as the extractant. The quantitative extraction exploits the high affinity of the succinate anion for the cavity of the azacryptate. The anion is effectively transferred from the aqueous phase, buffered at pH 7 with HEPES, into dichloromethane. A 1:1 extractant:anion adduct is obtained. Extraction can be easily monitored by following changes in the UV-visible spectrum of the dicopper complex in dichloromethane, and by measuring the residual concentration of succinate in the aqueous phase by HPLC−UV. Considering i) the relevance of polycarboxylates in biochemistry, as e.g. normal intermediates of the TCA cycle, ii) the relevance of dicarboxylates in the environmental field, as e.g. waste products of industrial processes, and iii) the recently discovered role of succinate and other dicarboxylates in pathophysiological processes including cancer, our results open new perspectives for research in all contexts where selective recognition, trapping and extraction of polycarboxylates is required. </p> </div>

scholarly journals Exploitation of Bentonite for Wastewater Treatment

2021 ◽  
Author(s):  
Kali Abderrahim ◽  
Loulidi Ilyasse ◽  
Amar Abdelouahed ◽  
Boukhlifi Fatima ◽  
Hadey Chaimaa ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Phenol Adsorption ◽  
Significant Percentage ◽  
Adsorption Study ◽  
The Subject ◽  
Uv Visible ◽  
Xrd Techniques ◽  
Kinetics Of ◽  
Langmuir And Freundlich Models

Bentonite is a clay with interesting surface properties (affinity for water, adsorption capacity for electro-positive compounds….). The characteristics and clarifying properties of bentonite from various companies are the subject of numerous studies. The present work focuses on the study of the efficiency of bentonite and modified bentonite to purify aqueous solutions containing organic pollutants such as phenol. First, before starting the adsorption study, a physical–chemical characterization of the clay by FTIR, BET and XRD techniques was undertaken. The specific surface of the bentonite is calculated by BET. Then, the study of isotherms and kinetics of phenol adsorption on commercial BTC showed that this pollutant can be removed from liquid effluents with a significant percentage. Langmuir and Freundlich models were applied. Finally, the kinetic study performed by UV–Visible was reproduced by FTIR spectroscopy.

scholarly journals Self-assembled graphene-based microfibers with eclectic optical properties

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mahdi Ghamsari ◽  
Tayyebeh Madrakian ◽  
Abbas Afkhami ◽  
Mazaher Ahmadi
Keyword(s):  
Optical Properties ◽  
Free Standing ◽  
Mechanical And Electrical Properties ◽  
Near Ir ◽  
The Subject ◽  
Uv Visible ◽  
Self Assembled ◽  
Optical Applications ◽  
Upconversion Emissions ◽  
Tunable Interference

AbstractThe construction of graphene-based microfibers with reinforced mechanical and electrical properties has been the subject of numerous researches in recent years. However, the fabrication of graphene-based fibers with remarkable optical features still remains a challenge and has not been addressed so far. This paper aims to report a series of flexible self-assembled fibers, synthesized through a few-minute sonication of thermally oxidized graphene oxide nanosheets, so-called Nanoporous Over-Oxidized Graphene (NOG), in an acidic medium. These free-standing glassy fibers were classified into four distinct morphological structures and displayed a collection of intriguing optical properties comprising high transparency, strong birefringence, fixed body colorations (e.g. colorless, blue, green, and red), tunable interference marginal colorations, UV–visible-near IR fluorescence, and upconversion emissions. Moreover, they exhibited high chemical stability in strongly acidic, basic, and oxidizing media. The foregoing notable attributes introduce the NOG fiber as a promising candidate both for the construction of graphene-based photoluminescent textiles and the development of a wide variety of optical applications.

scholarly journals STANDARDIZATION AND COMPARATIVE ANALYSIS OF DIFFERENT MARKETED FORMULATION OF AGNIMUKH CHURNA

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Sharath M.V. ◽  
S.M. Prasanna ◽  
G. Narayana Murthy ◽  
M.C Ravi
Keyword(s):  
Comparative Analysis ◽  
Chemical Properties ◽  
Mental Function ◽  
Herbal Products ◽  
Marker Compound ◽  
Polyherbal Formulation ◽  
Physico Chemical ◽  
The Subject ◽  
Uv Visible ◽  
Bleeding Hemorrhoids

The subject of herbal drug standardization is massively wide and deep, there is so much to know and so much seemingly contradictory theories on the subject of herbal medicine and its relationship with human physiology and mental function. India needs to explore the important formulations in the classical ayurvedic texts. This can be achieved only if the herbal products are evaluated and analysed using sophisticated modern techniques of standardization such as UV-Visible, TLC, HPLC, HPTLC, etc. The present paper reports on Standardization and Comparative Analysis of Different Marketed Formulation of Agnimukh Churna, a poly herbal ayurvedic medicine used in treatment of anorexia, indigestion, constipation, spleen disorders, non bleeding hemorrhoids’ and abdominal pain. Agnimukh Churna was prepared as per Ayurvedic text of Yogaratnakara, India. In-house preparation and two marketed have been standardized on the basis of organoleptic characters, physical characteristics, physico-chemical properties, TLC and HPLC for the estimation of marker compound Piperine. The set parameters were found to be sufficient to evaluate the Churna and can be used as reference standards for the quality control/quality assurance laboratory of a Pharmaceutical house. Keywords: Agnimukh Churna; Physicochemical parameters; organoleptic characters; Polyherbal formulation; Standardization; Piperine

scholarly journals Adaptasi Masyarakat Transmigran di Desa Batang Pane II, Kecamatan Padang Bolak, Kabupaten Padang Lawas Utara

2019 ◽  
Vol 4 (2) ◽  
pp. 188
Author(s):  
Yuyun Trisna Yuningsih ◽  
Nurjannah Nurjannah
Keyword(s):  
Ethnic Group ◽  
Indigenous People ◽  
Standard Of Living ◽  
Social Solidarity ◽  
The Social ◽  
Barren Soil ◽  
History Of ◽  
Qualitative Descriptive ◽  
The Subject ◽  
The Government

This study aims to determine the history, driving factors, adaptation, social solidarity, and barriers faced by Javanese and Sundanese ethnic transmigrant communities in adapting in Batang Pane II Village, Padang Bolak District, North Padang Lawas Regency. This study used a qualitative descriptive study with the subject of Javanese, Sundanese, and indigenous ethnic transmigrant communities namely the Batak Angkola sub-community. The results of the study show that the history of their transmigration was a result of the general transmigration program of 1982 under the rule of President Suharto. The driving factor is because you want to improve your standard of living, and get a more prosperous life. The adaptation of the transmigrant community went well, as evidenced by the interaction and communication that took place between each ethnic group. The social solidarity that occurs, can be seen in various kinds of activities carried out jointly, collaborating with each other and establishing cohesiveness in the community. Barriers to adaptation to barren soil environments so that people cannot grow crops other than perennials at the beginning of transmigration. The obstacle in communicating is because each ethnic group has a different language. The conclusion is that transmigrant communities with indigenous people each adapt to each other. The adaptation process does not fully occur naturally, but has been programmed by the government with evidence of laying houses for transmigrants and indigenous people randomly.

scholarly journals Biodegradation of Methyl Parathion Using Pseudomonas stutzeri (MTCC 2643)

2020 ◽  
Vol 2 (2) ◽  
pp. 19-33
Author(s):  
Archana S ◽  
Surendran A ◽  
Thatheyus AJ
Keyword(s):  
Bacterial Strain ◽  
Hplc Analysis ◽  
Methyl Parathion ◽  
Crop Protection ◽  
Pseudomonas Stutzeri ◽  
Cost Effective ◽  
Agricultural Fields ◽  
Microbial Remediation ◽  
Uv Visible

Pesticides applied in agricultural fields for crop protection result in the contamination of the environment. They also affect the flora and fauna as well as the quality of air, water and soil. Hence their remediation is of concern. Among different strategies available, microbial remediation is cost effective and ecofriendly. The present work is designed to test the efficiency of Pseudomonas stutzeri, a bacterial strain obtained from MTCC, IMTECH, Chandigarh, India. After treating with 50, 100, 150 and 200 ppm of methyl parathion, parameters like, orthophosphate released, pH and turbidity changes were monitored upto thirty hours. Degradation of 200 ppm concentration was confirmed by UV-Visible spectrophotometry and HPLC analysis. This strain effectively degraded methyl parathion and it can be used in the remediation of contaminated agricultural fields.

Words

PMLA ◽  
1935 ◽  
Vol 50 (4) ◽  
pp. 1320-1327
Author(s):  
Colbert Searles
Keyword(s):  
Subject Matter ◽  
Assistant Professor ◽  
The Subject

THE germ of that which follows came into being many years ago in the days of my youth as a university instructor and assistant professor. It was generated by the then quite outspoken attitude of colleagues in the “exact sciences”; the sciences of which the subject-matter can be exactly weighed and measured and the force of its movements mathematically demonstrated. They assured us that the study of languages and literature had little or nothing scientific about it because: “It had no domain of concrete fact in which to work.” Ergo, the scientific spirit was theirs by a stroke of “efficacious grace” as it were. Ours was at best only a kind of “sufficient grace,” pleasant and even necessary to have, but which could, by no means ensure a reception among the elected.

Artificial satellite orbit computations

1966 ◽  
Vol 25 ◽  
pp. 363-371
Author(s):  
P. Sconzo
Keyword(s):  
Artificial Satellite ◽  
Satellite Orbit ◽  
Artificial Satellites ◽  
Orbital Elements ◽  
Differential Correction ◽  
Gravitational Effects ◽  
Short Intervals ◽  
The Subject ◽  
Introductory Discussion ◽  
Orbit Computation

In this paper an orbit computation program for artificial satellites is presented. This program is operational and it has already been used to compute the orbits of several satellites.After an introductory discussion on the subject of artificial satellite orbit computations, the features of this program are thoroughly explained. In order to achieve the representation of the orbital elements over short intervals of time a drag-free perturbation theory coupled with a differential correction procedure is used, while the long range behavior is obtained empirically. The empirical treatment of the non-gravitational effects upon the satellite motion seems to be very satisfactory. Numerical analysis procedures supporting this treatment and experience gained in using our program are also objects of discussion.

C. Wire Cabling for Telescope Systems

1966 ◽  
Vol 27 ◽  
pp. 159-161
Keyword(s):  
The Subject ◽  
Data Multiplexing

Rule: I'd like at this point to bring up the subject of cables and wireways around the telescope. We've touched upon this twice during previous sessions: the cable wrap up problem, the communications problem, and data multiplexing problem. I think we'll ask Bill Baustian if he will give us a brief run down on what the electrical run problems are, besides doubling the system every year.

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