scholarly journals Visible color changes estimation in colorimetric determination of chromium (VI) using polymeric sensors

ACTA IMEKO ◽  
2016 ◽  
Vol 5 (3) ◽  
pp. 95 ◽  
Author(s):  
Nataliya A. Gavrilenko ◽  
Sergey V. Muravyov ◽  
Nadezhda V. Saranchina ◽  
Alexey V. Sukhanov
Keyword(s):  
Solid Phase ◽  
Tap Water ◽  
Color Difference ◽  
Colorimetric Determination ◽  
Color Analysis ◽  
Color Coordinates ◽  
Color Changes ◽  
Relative Standard ◽  
Solid Phase Spectrophotometry

<p class="Abstract"><span lang="EN-US">The paper describes an application of a kind of optical analytical method, digital color analysis (DCA), using colorimetric polymethacrylate sensors (optodes) in order to determine Cr (VI). The optodes are made of optically transparent polymethacrylate matrix (PMM) with 1.5-diphenylcarbazide immobilized. The developed optode can be used in determination of the analytes using solid phase spectrophotometry and calculating color coordinates as functions of absorbance spectra. Also color coordinates can be represented as basic color (e.g. RGB) data after the optode image digitizing. Then one can determine the content of an analyte in a sample by an appropriate color difference calculated for these coordinates. Experimental results of Cr (VI) determination in tap water show that the DCA relative standard deviation is 8-17 % and recovery is &lt; 12 % at the range of determined concentrations 0.05-1.0 </span><span lang="EN-US">mg·L<sup>–1</sup></span><span lang="EN-US">. The characteristics are comparable with those of the solid phase spectrophotometry.</span></p>

scholarly journals Determination of Se4+ in Drinkable Water by Solid-Phase Microextraction and Gas Chromatography/Mass Spectrometry

2000 ◽  
Vol 83 (5) ◽  
pp. 1082-1086 ◽  
Author(s):  
Maurizio Guidotti
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Tap Water ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Relative Standard ◽  
Drinkable Water

Abstract A method was developed for the selective determination of Se4+ in drinkable water by solid-phase microextraction (SPME) and gas chromatography/mass spectrometry (GC/MS). Se4+ was selectively derivatized to ethane, 1,1′-selenobis by reaction with sodium tetraethylborate, extracted by the SPME fiber, and determined by GC/MS. Both headspace (HS)–SPME and direct SPME were studied. The method requires only a few milliliters of sample and 20 min for completion. At 2.0 μg/L concentration, the relative standard deviation was 10.1% for HS–SPME and 9.1% for direct SPME. For HS–SPME, the theoretical detection limit was 81 ng/L and 166 ng/L for direct SPME. The recovery rate was 95%. The method was used to determine Se4+ in 10 tap water samples.

Determination of Sulfite in Rainwater by Solid-Phase Spectrophotometry

1994 ◽  
Vol 77 (5) ◽  
pp. 1224-1229 ◽  
Author(s):  
Juan M Bosque-Sendra ◽  
Francisca Molina ◽  
Mounir Nechar
Keyword(s):  
Calibration Curve ◽  
Solution Method ◽  
Solid Phase ◽  
Specific Method ◽  
Similar Reaction ◽  
Analytical Sensitivity ◽  
Limit Values ◽  
Relative Standard ◽  
Solid Phase Spectrophotometry

Abstract A simple and specific method was developed for the determination of sulfite in rainwater based on solid-phase spectrophotometry (SPS). Rainwater was collected on morpholine, sulfite was stabilized by forming an adduct that reacted with pararosanil-ine and formaldehyde, and the reaction product was fixed on Dowex 1-X8 resin. The absorbance of the solid phase was measured directly at 565 and 700 nm. The calibration curve was linear in the concentration range of 1-50 μg/L in solution (relative standard deviation = 1.7%); the International Union of Pure and Applied Chemistry detection limit was 0.8 μg/L. In simulated rainwater, the values of the calibration curve slopes were similar to that of the standard calibration curve slope, and recoveries for 40-497 μg/L sulfite ranged from 97 to 105%. Linearity, analytical sensitivity, and precision were better for the SPS method than the solution method, and the detection and quantitation limit values were lower for the SPS method than the solution method based on the similar reaction. The SPS method was subsequently used to determine sulfite in real rainwater.

scholarly journals Microdetermination of Methenamine in the Presence of Formaldehyde by Solid Phase Spectrophotometry

2012 ◽  
Vol 2012 ◽  
pp. 1-5
Author(s):  
Mehdi Taghdiri ◽  
Yadollah Yamini ◽  
Ali Moloudi
Keyword(s):  
Industrial Wastewater ◽  
Solid Phase ◽  
Sample Volume ◽  
Ion Pair ◽  
Pair Formation ◽  
Bromocresol Green ◽  
Green Is ◽  
Relative Standard ◽  
Solid Phase Spectrophotometry

A sensitive spectrophotometric method for the determination of methenamine has been developed without any separation steps. Bromocresol green is adsorbed on Sephadex LH-20 gel but the sorption decreases in the presence of methenamine due to ion-pair formation between bromocresol green and methenamine in solution. This attenuation was used to the microdetermination of methenamine by measurement of absorbance of the solid phase (Sephadex LH-20 gel) in a 1.0 mm cell at 625 nm. Methenamine could be determined in the concentration range of 0.42–1.68 μg mL−1 (10-mL Sample volume) with a relative standard deviation (RSD) of 0.03% (n=4). The detection limit obtained was 50 μg L−1 for 10 mL sample volume. The method was used for determination of methenamine in industrial wastewater and a satisfactory result was obtained.

scholarly journals Application of Sephadex LH-20 for Microdetermination of Dopamine by Solid Phase Spectrophotometry

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Mehdi Taghdiri ◽  
Arash Mohamadipour-taziyan
Keyword(s):  
Solid Phase ◽  
Sample Volume ◽  
Ion Pair ◽  
Pair Formation ◽  
Bromocresol Green ◽  
Green Is ◽  
Relative Standard ◽  
Solid Phase Spectrophotometry ◽  
Sensitive Spectrophotometric Method

A sensitive spectrophotometric method for the determination of dopamine was carried out without any separation steps. Bromocresol green is adsorbed on Sephadex LH-20 gel but the sorption decreases in the presence of dopamine due to ion-pair formation between bromocresol green and dopamine in solution. This attenuation was used to the microdetermination of dopamine by measurement of absorbance of the solid phase (Sephadex LH-20 gel) in a 1.0 mm cell at 625 nm. Dopamine could be determined in the concentration range of 0.4–1.6 μg mL−1 (10-mL Sample volume) with a relative standard deviation (RSD) of 0.03% (). The detection limit was obtained, 0.26 μg mL−1 (1.7 μM). The method was used for determination of dopamine in pharmaceutical injection sample and satisfactory result was obtained.

scholarly journals Determination of Copper in Tap Water Using Solid-Phase Spectrophotometry

1994 ◽  
Vol 27 (13) ◽  
pp. 2589-2599 ◽  
Author(s):  
Carol M. Hill ◽  
Kenneth W. Street ◽  
Warren H. Philipp ◽  
Stephen P. Tanner
Keyword(s):  
Solid Phase ◽  
Tap Water ◽  
Solid Phase Spectrophotometry ◽  
Determination Of Copper

scholarly journals Determination of the fenvalerate insecticide in natural waters by a photochemically-induced fluorescence method

2015 ◽  
Vol 34 (2) ◽  
pp. 245 ◽  
Author(s):  
Diène Diégane Thiaré ◽  
Atanasse Coly ◽  
Diégane Sarr ◽  
Abdourakhmane Khonté ◽  
Amadou Diop ◽  
...  
Keyword(s):  
Natural Waters ◽  
Sea Water ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Irradiation Time ◽  
Tap Water ◽  
Analytical Sensitivity ◽  
Photochemically Induced Fluorescence ◽  
Relative Standard

<p>The fenvalerate pyrethroid insecticide was determined in various types of natural waters of Senegal by means of a newly-developed, simple, rapid and very sensitive photochemically-induced fluorescence (PIF) method. The PIF method was optimized with respect to the irradiation time, solvent and pH. The obtained calibration curves yielded correlation coefficients very close to unity. The limit of detection (LOD) and of quantification (LOQ) values were very low (LOD = 0.01–0.66 ng/ml and LOQ = 0.04–2.20 ng/ml, according to the solvent), and the relative standard deviation (RSD) values were small, ranging between 0.1 and 1.5 %, which indicated a very good analytical sensitivity and a great repeatability of PIF. Recovery studies were performed on spiked distilled water, tap water, sea water, well water, river water and draining water samples of Senegal, using the liquid-liquid extraction (LLE), solid phase extraction (SPE), and standard addition procedures. Satisfactory recovery results (about 85–121%) were obtained for the determination of fenvalerate in an aquatic environment.</p>

scholarly journals Determination of Phenol in Tap Water and River Water Samples by Solid-Phase Spectrophotometry

2000 ◽  
Vol 16 (3) ◽  
pp. 269-273 ◽  
Author(s):  
Isoshi NUKATSUKA ◽  
Sachiko NAKAMURA ◽  
Kaori WATANABE ◽  
Kunio OHZEKI
Keyword(s):  
River Water ◽  
Water Samples ◽  
Solid Phase ◽  
Tap Water ◽  
River Water Samples ◽  
Solid Phase Spectrophotometry

scholarly journals Determination of 77 Multiclass Pesticides and Their Metabolitesin Capsicum and Tomato Using GC-MS/MS and LC-MS/MS

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1837
Author(s):  
Harischandra Naik Rathod ◽  
Bheemanna Mallappa ◽  
Pallavi Malenahalli Sidramappa ◽  
Chandra Sekhara Reddy Vennapusa ◽  
Pavankumar Kamin ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Solid Phase ◽  
Graphitized Carbon Black ◽  
Limit Of Quantification ◽  
Gas And Liquid Chromatography ◽  
Relative Standard ◽  
The Matrix ◽  
Liquid Chromatography Tandem Mass ◽  
Primary Secondary Amine

A quick, sensitive, and reproducible analytical method for the determination of 77 multiclass pesticides and their metabolites in Capsicum and tomato by gas and liquid chromatography tandem mass spectrometry was standardized and validated. The limit of detection of 0.19 to 10.91 and limit of quantification of 0.63 to 36.34 µg·kg−1 for Capsicum and 0.10 to 9.55 µg·kg−1 (LOD) and 0.35 to 33.43 µg·kg−1 (LOQ) for tomato. The method involves extraction of sample with acetonitrile, purification by dispersive solid phase extraction using primary secondary amine and graphitized carbon black. The recoveries of all pesticides were in the range of 75 to 110% with a relative standard deviation of less than 20%. Similarly, the method precision was evaluated interms of repeatability (RSDr) and reproducibility (RSDwR) by spiking of mixed pesticides standards at 100 µg·kg−1 recorded anRSD of less than 20%. The matrix effect was acceptable and no significant variation was observed in both the matrices except for few pesticides. The estimated measurement uncertainty found acceptable for all the pesticides. This method found suitable for analysis of vegetable samples drawn from market and farm gates.

scholarly journals Quantitative Determination of Azithromycin in Human Plasma by Liquid Chromatography–Mass Spectrometry and its Application in Pharmackokinetic Study

2012 ◽  
Vol 11 (1) ◽  
pp. 55-63 ◽  
Author(s):  
Maizbha Uddin Ahmed ◽  
Mohammad Safiqul Islam ◽  
Tasmin Ara Sultana ◽  
AGM Mostofa ◽  
Muhammad Shahdaat Bin Sayeed ◽  
...  
Keyword(s):  
Mobile Phase ◽  
Solid Phase ◽  
Internal Standard ◽  
Extraction Process ◽  
Serum Samples ◽  
Limit Of Quantification ◽  
Relative Standard ◽  
Linear Concentration Range ◽  
Linear Concentration

Azithromycin is an effective and well-known antimicrobial agent. In the present study, a simple, sensitive and specific LC/MS/MS method has been developed and validated for the quantification of Azithromycin in  human serum samples using Clarithromycin as internal standard. Azithromycin was extracted from biological matrix  by using solid phase extraction process. The chromatographic separation was performed on Luna C18 (3 ?, 2x150   mm) column with a mobile phase consisting of 35 mM ammonium acetate buffer (mobile phase-A) and acetonitrile  and methanol in ratio of 90:10 ( as mobile phase-B) at a flow rate of 0.25 mL/min. The method was validated over a  linear concentration range of 0.5?50.0 ng/mL and limit of quantification (LOQ) was 0.5 ng/mL with a coefficient of  correlation (r2) = 0.9998. The intra-day and inter-day precision expressed as relative standard deviation were 1.64% – 8.43% and 2.32% – 9.92%, respectively. The average recovery of azithromycin from serum was 98.11%. The method  was successfully applied to a pharmacokinetic study after oral administration of Azithromycin 200 mg/5 ml suspension in healthy Bangladeshi volunteers. DOI: http://dx.doi.org/10.3329/dujps.v11i1.12488 Dhaka Univ. J. Pharm. Sci. 11(1): 55-63, 2012 (June)

Solid Phase Spectrophotometry for the Determination of Cobalt in Pharmaceutical Preparations

2001 ◽  
Vol 137 (1-2) ◽  
pp. 29-33 ◽  
Author(s):  
Leonardo Sena Gomes Teixeira ◽  
Ant�nio Celso Sp�nola Costa ◽  
J�lio C�sar Rosa Assis ◽  
S�rgio Luis Costa Ferreira ◽  
Mauro Korn
Keyword(s):  
Solid Phase ◽  
Pharmaceutical Preparations ◽  
Solid Phase Spectrophotometry
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