CdS-Intercalated Bentonite/Carbon Composite as Electrode for Sulfide Ion

2010 ◽  
Vol 663-665 ◽  
pp. 690-693 ◽  
Author(s):  
Kemawadee Udomphan ◽  
Atchana Wongchaisuwat ◽  
Ladda Meesuk
Keyword(s):  
Aqueous Solution ◽  
Low Cost ◽  
Carbon Composite ◽  
Good Precision ◽  
Solid Reaction ◽  
Artificial Graphite ◽  
Bright Yellow ◽  
Photochemical Properties

CdS, a bright yellow precipitate is well known for its optical, electrical, electro-optical and photochemical properties. CdS has also been prepared in the interlayer spaces of layered materials such as laponite and montmorillonite (bentonite). Several properties of intercalated CdS have been studied, but for the best of our knowledge there is no reports on its use. In this work, we applied CdS-intercalated bentonite / carbon composite as an electrode for determination of S2- ion in aqueous solution. CdS- intercalated bentonite was prepared by the in situ solid-solid reaction between Cd(II)-bentonite and Na2S. To construct a potentiometric electrode, CdS-intercalated bentonite was mixed with artificial graphite, polytetrafluoroethylene (PTFE) and carboxymethylcellulose (CMC) in an appropriate ratio. The electrode was used to determine S2- in aqueous solution, graphs of log [S2-] vs measured voltage (mv) gave linear relation up to 3 orders of ion concentrations. Apart from the reproducibility and good precision, the electrode is good for its selectivity, durability and low cost.

CdS-Intercalated Bentonite: A Novel Sulfide Ion Selective Electrode

2011 ◽  
Vol 110-116 ◽  
pp. 472-477 ◽  
Author(s):  
Kemawadee Udomphan ◽  
Atchana Wongchaisuwat ◽  
Ladda Meesuk
Keyword(s):  
Carboxymethyl Cellulose ◽  
Low Cost ◽  
Ion Selective Electrode ◽  
Good Precision ◽  
Selective Electrode ◽  
Solid Reaction ◽  
Artificial Graphite ◽  
Sulfide Ion

CdS-intercalated bentonite was prepared by an in situ solid-solid reaction and mixed with artificial graphite, polytetrafluoroethylene (PTFE) and carboxymethyl cellulose (CMC) in an appropriate ratio to construct a novel, potentiometric sulfide ion selective electrode. Apart from its good selectivity, the electrode is low cost and good precision.

scholarly journals Rapid in situ determination of ClO2 in drinking water by improved solid DPD spectrophotometry

2021 ◽  
Vol 252 ◽  
pp. 02063
Author(s):  
Qianqian Zhang ◽  
Lijun Jia ◽  
Tianli Hao ◽  
Ke Zeng
Keyword(s):  
Drinking Water ◽  
Low Cost ◽  
Direct Determination ◽  
Correlation Coefficients ◽  
Good Precision ◽  
Relative Standard ◽  
Relative Errors ◽  
Parallel Tests

This research aims to realize the rapid detection of ClO2 content in drinking water by adopting improved solid DPD. This method is fast and convenient with low cost and less waste liquid. The results show that this method has good precision and sensitivity. The linear correlation coefficients of the cubic regression equation were all greater than 0.999. The detection limit of the method was 0.002mg/L ClO2. The relative standard deviations (RSD) of seven parallel tests were between 1.37% and 8.87%, and the relative errors were small. The recovery rate was 96.67~110%. The method could be used for the direct determination of water samples with a mass concentration of 0.02mg/L~2.00mg/L in drinking water after ClO2 disinfection.

ZnS-Intercalated Montmorillonite: A Low Cost Potentiometric Sensor

2013 ◽  
Vol 787 ◽  
pp. 291-295
Author(s):  
Siriphorn Udkhao ◽  
Atchana Wongchaisuwat ◽  
Ladda Meesuk
Keyword(s):  
Sodium Sulfide ◽  
Low Cost ◽  
Optoelectronic Devices ◽  
Crystal Form ◽  
Good Precision ◽  
Solid Reaction ◽  
Artificial Graphite ◽  
Ion Concentrations ◽  
Measured Voltage ◽  
First Time

ZnS is well known for its potential uses, both in crystal form and powder, as optoelectronic devices and as a phosphor. In this work, we prepared ZnS-intercalated montmorillonite by the insitu solid-solid reaction between Zn (II)-montmorillonite and sodium sulfide. A potentiometric electrode was constructed from a mixture of ZnS-intercalated montmorillonite, artificial graphite, polytetrafluoroethylene (PTFE) and carboxymethylcellulose (CMC) in an appropriate ratio. The electrode was used to determine S2- in aqueous solution, graphs of log [S2-] vs. measured voltage gave linear relation up to 3rd order of ion concentrations. It can be said that, this is the first time that ZnS-intercalated montmorillonite is used to construct a potentiometric electrode. Apart from a good precision, the electrode is good for its selectivity, durability and low cost.

scholarly journals A Simple, Rapid, Fluorometric Assay for Dopamine by In Situ Reaction of Boronic Acids and cis-Diol

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoxia Liu ◽  
Miaomiao Tian ◽  
Wenmei Gao ◽  
Jinzhong Zhao
Keyword(s):  
Low Cost ◽  
Boronic Acids ◽  
Emission Peak ◽  
Excitation Wavelength ◽  
Fluorescence Sensing ◽  
Serum Samples ◽  
Turn On ◽  
Rapid Reaction

An efficient, sensitive, and low-cost method has been developed for turn-on fluorescence sensing of dopamine (DA). The method relies on the rapid reaction of DA and 3-Hydroxyphenylboronic acid (3-HPBA) via specific recognition between boronic acids and cis-diol of DA in alkaline solution. The reaction product shows an excitation wavelength of 417 nm and the maximum emission peak at 470 nm. The proposed method allows the determination of DA in the range of 50 nM–25 μM, and the whole detection can be completed within 5 minutes. Furthermore, the presented approach has good selectivity and has been successfully applied to DA sensing in human serum samples, showing great potential in clinical diagnosis.

scholarly journals Development and application of a portable instrument for drugs analysis in pharmaceutical preparations

2015 ◽  
Vol 51 (3) ◽  
pp. 699-708
Author(s):  
Paulo Roberto da Silva Ribeiro ◽  
Helena Redigolo Pezza ◽  
Leonardo Pezza ◽  
Liliane Spazzapam Lima ◽  
Matthieu Tubino
Keyword(s):  
Low Cost ◽  
Pharmaceutical Preparations ◽  
Pharmaceutical Products ◽  
Ammonium Molybdate ◽  
Quantitative Studies ◽  
Significant Difference ◽  
Drugs Analysis ◽  
And Performance

This article describes the application and performance of an inexpensive, simple and portable device for colorimetric quantitative determination of drugs in pharmaceutical preparations. The sensor is a light detector resistor (LDR) incorporated into a black PTFE cell and coupled to a low-cost multimeter (Ohmmeter). Quantitative studies were performed with captopril/p-chloranil/H2O2 and methyldopa/ammonium molybdate systems. Calibration curves were obtained by plotting the electrical resistance of the LDR against the concentration of the colored species in the ranges 1.84 × 10-4 to 1.29 × 10-3mol L-1 and 5.04 × 10-4 to 2.52 × 10-3 mol L-1 for captopril/p-chloranil/H2O2 and methyldopa/ammonium molybdate systems, respectively, exhibiting good coefficients of determination. Statistical analysis of the results obtained showed no significant difference between the proposed methodologies and the official reported methods, as evidenced by the t-test and variance ratio at a 95% confidence level. The results of this study demonstrate the applicability of the instrument for simple, accurate, precise, fast,in situ and low-cost colorimetric analysis of drugs in pharmaceutical products.

scholarly journals In Situ Determination of Urea in Milk Employing a Portable and Low-Cost LED Photometer

2017 ◽  
Vol 11 (4) ◽  
pp. 1149-1154
Author(s):  
Willian Toito Suarez ◽  
Benedito Roberto de Alvarenga Junior ◽  
Mathews de Oliveira Krambeck Franco ◽  
Wesley Lira Gabriel ◽  
Denílson Mendes de Oliveira ◽  
...  
Keyword(s):  
Low Cost ◽  
Led Photometer

[Ca (2,2′-Bipyridine)3]2+-Intercalated Montmorillonite: An Application as Potentiometric Sensor

2012 ◽  
Vol 428 ◽  
pp. 7-13 ◽  
Author(s):  
S. Payungsak ◽  
Atchana Wongchaisuwat ◽  
Ladda Meesuk
Keyword(s):  
Interlayer Space ◽  
C:N Ratio ◽  
Potentiometric Sensor ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Solid Reaction ◽  
X Ray ◽  
Artificial Graphite ◽  
Higher Sensitivity

This article involves the use of [Ca (2,2′-bipyridine)3]2+-intercalated montmorillonite as a potentiometric sensor to measure anions in aqueous solution. The [Ca (2,2′-bipyridine)3]2+-intercalated montmorillonite was prepared by modification of an in situ solid-solid reaction, between natural Ca (II)-montmorillonite and 2,2′-bipyridine at a molar ratio 1:3. The formation of [Ca (2,2′-bipyridine)3]2+- in the interlayer space of montmorillonite was confirmed by powder X-ray diffraction (XRD) and the existence of 2,2′-bipyridine was confirmed by the C:N ratio of the product compared with that of the 2,2′-bipyridine molecule. The potentiometric sensor was constructed by mixing [Ca (2,2′-bipyridine)3]2+-intercalated montmorillonite with artificial graphite, polytetrafluoroethylene (PTFE) and carboxymethylcellulose (CMC) in an appropriate ratio. It was found that the sensor had higher sensitivity to S2- rather than other anions, graphs of log [S2-] vs voltage (mv) gave a slope 30.0 which was closed to theoretical value, 29.5. Activity of the [Ca (2,2′-bipyridine)3]2+ sensor was verified by using sensor made from Ca (II)-montmorillonite as a reference. Reproducibility and precision of the electrode were also determined.

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