A Novel Quinoline Derivative for Selective and Sensitive Visual Detection of PPB Level Cu2+ in Aqueous Solution.

2020 ◽  
Vol 16 ◽  
Author(s):  
Nilimesh Das ◽  
Tanmoy Khan ◽  
Aritra Das ◽  
Vipin Kumar Jain ◽  
Joydev Acharya ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Drinking Water ◽  
Visual Detection ◽  
Quinoline Derivative ◽  
Optimum Level ◽  
Yellow Color ◽  
Synthetic Procedure ◽  
Absorption And Emission Spectroscopy ◽  
Steady State Absorption ◽  
Pale Yellow Color

Aim: Selective and sensitive visual detection of Cu2+in aqueous solution at PPB level using easily synthesized compound. Background: The search for a chemosensor that can detect Cu2+ is very long owing to the fact that an optimum level of Cu2+ is required for human health and the recommended amount of Cu2+ in drinking water is set to be 1-2 mgL-1 . Thus, it is very important to detect Cu2+ even at a very low concentration to assess the associated health risks. Objective: We are still seeking for the easiest, cheapest, fastest and greenest sensor that can selectively, sensitively and accurately detect Cu2+ with lowest detection limit. Our objective of this work is to find one such Cu2+ sensor. Methods: We have synthesized a quinoline derivative following very easy synthetic procedures and characterize the compound by standard methods. For sensing study, we used steady state absorption and emission spectroscopy. Results: Our sensor can detect Cu2+ selectively and sensitively in aqueous solution instantaneously even in the presence of excess amount of other salts. The pale-yellow color of the sensor turns red on the addition of Cu2+ . There is no interference from other cations and anions. A 2:1 binding mechanism of the ligand with Cu2+ is proposed using Jobs plot with binding constant in the order of 109 M-2 . We calculated the LOD to be 18 ppb, which is quite low than what is permissible in drinking water. Conclusion: We developed a new quinoline based chemo-sensor following straightforward synthetic procedure from very cheap starting materials that can detect Cu2+ visually and instantaneously in aqueous solution with ppb level sensitivity and zero interference from other ions.

Visual detection of carbonate ions by inverse opal photonic crystal polymers in aqueous solution

2015 ◽  
Vol 3 (37) ◽  
pp. 9524-9527 ◽  
Author(s):  
Lu Li ◽  
Bin Zhao ◽  
Yue Long ◽  
Jin-Ming Gao ◽  
Guoqiang Yang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photonic Crystal ◽  
Polymer Films ◽  
Visual Detection ◽  
Color Change ◽  
Ph Dependence ◽  
Inverse Opal ◽  
Carbonate Ions ◽  
Crystal Polymer

This communication demonstrates a facile method to detect CO32− by naked eyes through color change based on the pH dependence of inverse opal photonic crystal polymer films.

scholarly journals Viability of peach palm by-product, Spirulina platensis, and spinach for the enrichment of dehydrated soup

2018 ◽  
Vol 53 (11) ◽  
pp. 1259-1267
Author(s):  
Paulo Ricardo Los ◽  
Deise Rosana Silva Simões ◽  
Roberta de Souza Leone ◽  
Beatriz Cervejeira Bolanho ◽  
Taís Cardoso ◽  
...  
Keyword(s):  
Spirulina Platensis ◽  
Total Phenolic ◽  
Green Color ◽  
Peach Palm ◽  
Brazilian Legislation ◽  
Yellow Color ◽  
Microbiological Parameters ◽  
Market Niche ◽  
Dark Green ◽  
Pale Yellow Color

Abstract: The objective of this work was to develop dehydrated soup formulations using flour from peach palm by-product (PPB), Spirulina platensis or spinach, as well as to evaluate their composition by physical, chemical, instrumental, and sensory methods. Four formulations were developed: standard, PPB flour, PPB flour and S. platensis, and PPB flour and spinach. The samples were analyzed for proximate composition, chlorophyll content, total phenolic compounds, antioxidant activity, color, viscosity, water absorption, and microbiological parameters. The sensory characterization was performed by the check-all-that-apply method. The soups containing spinach or S. platensis presented the highest protein contents of 3.3 and 4.6 g 100 g-1, respectively. The soups formulated with the microalgae S. platensis showed higher contents of fibers, lipids, and antioxidants. Changes were observed in the color and viscosity of the soups. The standard dehydrated soup was characterized as shiny, creamy, with seasoning flavor and fragments, and a pale-yellow color; the formulation with spinach, as grainy, with an herb odor and flavor, seasoning fragments, and a dark-green color; and with S. platensis, with herb flavor, seasoning fragments, and a dark-green color. The developed formulations are within the microbiological standards for food established by the Brazilian legislation. The sensory analysis revealed a new market niche, and the soups containing PPB and S. platensis showed good acceptability. Peach palm flour, Spirulina platensis, and spinach are alternatives for the nutritional enrichment of dehydrated soups with high protein, ash, fiber, and antioxidant contents.

A self-assembled triphenylamine-based fluorescent chemosensor for selective detection of Fe3+ and Cu2+ ions in aqueous solution

RSC Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 6869-6878 ◽  
Author(s):  
Li Wenfeng ◽  
Ma Hengchang ◽  
Lu con ◽  
Ma Yuan ◽  
Qi Chunxuan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Drinking Water ◽  
High Selectivity ◽  
Fluorescent Chemosensor ◽  
Selective Detection ◽  
Simple Method ◽  
Self Assembled ◽  
Nanomolar Range

Triphenylamine-based fluorescent chemosensor m-TAPA (S) shows high selectivity and sensitivity toward Fe3+/Cu2+ in natural and drinking water. Additionally, the TCL strips serve as a simple method for detection of Fe3+/Cu2+ at the nanomolar range.

Prediction of chlorine and trihalomethanes concentration profile in bulk drinking water distribution systems from laboratory data

2003 ◽  
Vol 3 (1-2) ◽  
pp. 239-246 ◽  
Author(s):  
G. Kastl ◽  
I. Fisher ◽  
V. Jegatheesan ◽  
J. Chandy ◽  
K. Clarkson
Keyword(s):  
Drinking Water ◽  
Distribution System ◽  
Distribution Systems ◽  
Water Distribution ◽  
Laboratory Data ◽  
Water Distribution Systems ◽  
Optimum Level ◽  
Drinking Water Distribution Systems ◽  
Drinking Water Distribution ◽  
Chlorine Decay

Nearly all drinking water distribution systems experience a “natural” reduction of disinfection residuals. The most frequently used disinfectant is chlorine, which can decay due to reactions with organic and inorganic compounds in the water and by liquid/solids reaction with the biofilm, pipe walls and sediments. Usually levels of 0.2-0.5 mg/L of free chlorine are required at the point of consumption to maintain bacteriological safety. Higher concentrations are not desirable as they present the problems of taste and odour and increase formation of disinfection by-products. It is usually a considerable concern for the operators of drinking water distribution systems to manage chlorine residuals at the “optimum level”, considering all these issues. This paper describes how the chlorine profile in a drinking water distribution system can be modelled and optimised on the basis of readily and inexpensively available laboratory data. Methods are presented for deriving the laboratory data, fitting a chlorine decay model of bulk water to the data and applying the model, in conjunction with a simplified hydraulic model, to obtain the chlorine profile in a distribution system at steady flow conditions. Two case studies are used to demonstrate the utility of the technique. Melbourne’s Greenvale-Sydenham distribution system is unfiltered and uses chlorination as its only treatment. The chlorine model developed from laboratory data was applied to the whole system and the chlorine profile was shown to be accurately simulated. Biofilm was not found to critically affect chlorine decay. In the other case study, Sydney Water’s Nepean system was modelled from limited hydraulic data. Chlorine decay and trihalomethane (THM) formation in raw and treated water were measured in a laboratory, and a chlorine decay and THM model was derived on the basis of these data. Simulated chlorine and THM profiles agree well with the measured values available. Various applications of this modelling approach are also briefly discussed.

A reversible fluorescent-colorimetric chemosensor based on a novel Schiff base for visual detection of CO32− in aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72185-72192 ◽  
Author(s):  
Anupam Ghorai ◽  
Jahangir Mondal ◽  
Rukmani Chandra ◽  
Goutam K. Patra
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Visual Detection ◽  
Colorimetric Detection ◽  
Aqueous Media ◽  
Rapid Response ◽  
Colorimetric Chemosensor ◽  
Excellent Selectivity

A novel Schiff base receptor L has been fabricated for fluorescent-colorimetric detection of CO32− in aqueous media. L shows an excellent selectivity, rapid response and reversibility and its sensitivity for CO32− is the lowest ever found (96 nM).

THE REACTION OF CARBON DISULPHIDE WITH ALUMINA

1958 ◽  
Vol 36 (2) ◽  
pp. 296-302 ◽  
Author(s):  
A. G. Pinkus ◽  
J. S. Kim
Keyword(s):  
Aqueous Solution ◽  
Absorption Spectrum ◽  
Sodium Hydroxide ◽  
Carbon Disulphide ◽  
Minimum Value ◽  
Yellow Substance ◽  
Yellow Color

The absorption spectrum in aqueous solution of the yellow substance formed by the reaction of carbon disulphide and alumina exhibits absorption maxima at 398 and 325 mμ. This yellow color is not due to sodium disulphide as previously proposed since the latter substance showed an entirely different spectrum with shoulders at about 360–375 mμ and 290–300 mμ. The presence of both water and sodium hydroxide in the alumina is necessary for the formation of the yellow color in confirmation of previous work. A study of the gain in weight of the alumina with time of contact with carbon disulphide showed that this reaction begins to level off after about 24 hours. A minimum value for the heat evolved for the alumina–carbon disulphide system was determined as 8.6 cal. per g. of alumina reacting with an excess of carbon disulphide.

A Highly Selective and Sensitive Fluorescent Probe Based on Quinolone Derivative for Hg2+ in Aqueous Solution

2012 ◽  
Vol 549 ◽  
pp. 229-233
Author(s):  
Juan Juan Tian ◽  
Xin Zhou ◽  
Hui Juan Hao ◽  
Xue Wu
Keyword(s):  
Aqueous Solution ◽  
Fluorescent Probe ◽  
Limit Of Detection ◽  
Transition Metal Ions ◽  
Quinoline Derivative ◽  
Ligand Complex ◽  
Quinolone Derivative ◽  
Ph Range ◽  
Metal Ligand ◽  
Tof Ms

A new fluorescent probe, quinoline derivative DPQ bearing a methyl pyrrolidine-1-carbodithioate group, was synthesized and characterized by IR, Tof-MS and NMR. Its fluorescent behaviors toward transition metal ions were investigated. The results indicate that DPQ shows unique selective and high sensitive for Hg2+ in aqueous solution with a broad pH range 4-10. DPQ forms a 1:2 metal-ligand complex with Hg2+ ions with a limit of detection as low as 1.7×10-6 mol/L.

Fluoride removal from aqueous solution by Ca-pretreated macrophyte biomass

2008 ◽  
Vol 5 (1) ◽  
pp. 68 ◽  
Author(s):  
Patricia Miretzky ◽  
Carolina Muñoz ◽  
Alejandro Carrillo-Chávez
Keyword(s):  
Aqueous Solution ◽  
Developing Countries ◽  
Drinking Water ◽  
Sorption Capacity ◽  
Aquatic Macrophyte ◽  
Low Cost ◽  
Isotherm Models ◽  
Fluoride Removal ◽  
Natural Material ◽  
Macrophyte Biomass

Environmental context. Fluoride concentrations in drinking water above 1.5 mg L–1 may be detrimental to human health. Many methods have been developed for removing excessive fluoride from drinking water. The use of an aquatic macrophyte biomass (Eleocharis acicularis) pretreated with Ca2+, a low-cost natural material, could be a technique for rural populations in developing countries that cannot afford treated or bottled water for daily consumption. Abstract. The use of an aquatic macrophyte biomass (Eleocharis acicularis) pretreated with Ca2+ as a low-cost natural material for the removal of fluoride from aqueous solution was studied. Batch experiments were carried out to determine fluoride sorption capacity and the efficiency of the sorption process under different pH, initial F– and macrophyte biomass doses. The experimental data showed good fitting to Langmuir and Freundlich isotherm models. The maximum F adsorption capacity was 0.110 mmol g–1 with an efficiency of 64.5% (pH 6.0; 5.0 g L–1 Ca-pretreated biomass). The binding of Ca2+ to the biomass increased the removal efficiency over 100%. The F– removal kinetics were rapid, less than 30 min, and best described by the pseudo-second order rate model. The rate constant, the initial sorption rate and the equilibrium sorption capacity were determined. These results may be useful for deprived rural population water supply schemes in Mexico and in other developing countries.

Sign in / Sign up

Export Citation Format

Share Document