scholarly journals Determination of Lead Employing Simple Flow Injection AAS with Monolithic Alginate-Polyurethane Composite Packed In-Valve Column

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4397
Author(s):  
Piyanat Issarangkura Na Ayutthaya ◽  
Chonnipa Yeerum ◽  
Kullapon Kesonkan ◽  
Kanokwan Kiwfo ◽  
Kate Grudpan ◽  
...  
Keyword(s):  
Flow Injection ◽  
Polymerization Reaction ◽  
Linear Calibration ◽  
Switching Valve ◽  
Polyurethane Composite ◽  
Methylene Diphenyl Diisocyanate ◽  
Analyte Solution ◽  
Single Standard ◽  
Set Up ◽  
Simple Flow

A simple flow injection FlameAAS for lead determination with an alginate-polyurethane composite (ALG-PUC) monolithic in-valve column has been developed. The ALG-PUC monolithic rod was prepared by mixing methylene diphenyl diisocyanate with polyol and sodium alginate with the ratio of 2:1:1 by weight for a 5 min polymerization reaction. It was then put into a column (0.8 cm i.d × 11 cm length) situated in a switching valve for the FI set up. A single standard calibration could be obtained by plotting the loaded µg Pb2+ vs. FI response (absorbances). The loaded µg Pb2+ is calculated: μg Pb2+ = FRload × LT × CPb2+, where the FR load is the flow rate of the loading analyte solution (mL min−1), LT is the loading time (min), and CPb2+ is the Pb2+ concentration (µg mL−1). A linear calibration equation was obtained: FI response (absorbances) = 0.0018 [µg Pb2+] + 0.0032, R2 = 0.9927 for 1–150 µg Pb2+, and RSD of less than 20% was also obtained. Application of the developed procedure has been demonstrated in real samples.

scholarly journals Chemical Analysis through CL-Detection Assisted by Periodate Oxidation

2007 ◽  
Vol 2007 ◽  
pp. 1-10 ◽  
Author(s):  
Nicholaos P. Evmiridis ◽  
Athanasios G. Vlessidis ◽  
Nicholas C. Thanasoulias
Keyword(s):  
Chemical Analysis ◽  
Flow Injection ◽  
Research Work ◽  
Periodate Oxidation ◽  
Direct Determination ◽  
Good Reproducibility ◽  
Through Flow ◽  
Set Up ◽  
Simple Flow

The progress of the research work of the author and his colleagues on the field of CL-emission generated by pyrogallol oxidation and further application for the direct determination of periodate and indirect or direct determination of other compounds through flow-injection manifold/CL-detection set up is described. The instrumentation used for these studies was a simple flow-injection manifold that provides good reproducibility, coupled to a red sensitive photomultiplier that gives sensitive CL-detection. In addition, recent reports on studies and analytical methods based on CL-emission generated by periodate oxidation by other authors are included.

scholarly journals A Spectrophotometric Flow Injection Method for Determination of Ultratrace Amounts of Phenylhydrazine by Its Inhibition Effect on the Reaction of Thionin and Nitrite

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
M. Keyvanfard ◽  
Kh. Alizad
Keyword(s):  
Sulfuric Acid ◽  
Flow Injection ◽  
Sodium Nitrite ◽  
Calibration Graph ◽  
Optimum Conditions ◽  
Linear Calibration ◽  
Inhibition Effect ◽  
Colorimetric Procedure ◽  
Simple Flow

A simple flow injection colorimetric procedure for determining phenylhydrazine was established. It is based on the reaction of phenylhydrazine in sulfuric acid with thionin and sodium nitrite. Reaction was monitored spectrophotometrically by measuring thionin absorbance atλmax=602 nm. A standard or sample solution was injected into the sulfuric acid stream, which was then merged with sodium nitrite stream and thionin stream. Optimum conditions for determining phenylhydrazine were investigated by univariate method. Under the optimum conditions, a linear calibration graph was obtained over the range 0.05–0.60 μmol L−1, and the detection limit was 0.027 μmol L−1(s/n=3). The proposed method has been satisfactorily applied to the determination of phenylhydrazine in human serum and water samples.

scholarly journals REXIC project: retrospective cross-sectional study of documentation of informed consent for research biobanking in a public research and teaching hospital

2013 ◽  
Vol 2 (1) ◽  
pp. 10 ◽  
Author(s):  
Marta Nobile ◽  
Elena Garavelli ◽  
Barbara Gagliardi ◽  
Silvia Giovanelli ◽  
Paolo Rebulla ◽  
...  
Keyword(s):  
Informed Consent ◽  
Standard Model ◽  
Cross Sectional Study ◽  
Essential Elements ◽  
Cross Sectional ◽  
Research And Teaching ◽  
Single Standard ◽  
Set Up ◽  
Design And Methods

<em>Background</em>. The Center for Transfusion Medicine, Cell Therapy and Cryobiology, Milan, Northern Italy, is the headquarter of the POLI-MI biobank. It co-ordinates the biobank activities of the Fondazione Ca’ Granda Ospedale Maggiore Policlinico of Milan. Such activities require specific safeguarding of donors’ rights and protection of sensitive and genetic data. The Fondazione Ca’ Granda Ospedale Maggiore Policlinico has set up a project on informed consent with the aim of developing awareness and understanding of this issue. Within this project, it has been decided to evaluate how consent for biobanking material is expressed. <em>Design and methods.</em> The aim of the study was to evaluate the quality and completeness of consent to biobanking in the POLI-MI biobank. This was a retrospective study carried out in 2012 on samples of consent declarations collected by biobank units in 2011. Some units used a single, standard consent model available from a previous POLI-MI biobank workgroup. Other units used models which had been previouly formulated. Evaluation was made using a form that indicated the essential elements of consent. <em>Results</em>. A total of 48 consent declarations were collected using the single, standard model and 84 were collected using other models. The consent declarations that used the single, standard model were found to be the most complete and were filled in better than other models. <em>Conclusions</em>. Progressive adoption of a simple, standard consent model is expected to improve the quality of consent acquisition. Regular audit of the compliance of consent practices with ethical and legal requirements is mandatory to improve the quality of research biobanking.

scholarly journals Flow injection analysis of water. Part 1: Automatic preconcentration determination of sulphate, ammonia and iron(II)/iron(III)

1993 ◽  
Vol 15 (4) ◽  
pp. 141-146 ◽  
Author(s):  
J. S. Cosano ◽  
M. D. Luque de Castro ◽  
M. Valcárcel
Keyword(s):  
Flow Injection ◽  
Good Reproducibility ◽  
Chemical Systems ◽  
Sequential Determination ◽  
On Line ◽  
Exchange Material ◽  
Iron Complexation ◽  
Simple Flow ◽  
Ammonia Formation

This paper describes a simple flow-injection (FI) manifold for the determination of a variety of species in industrial water. The chemical systems involved in the determination of ammonia (formation of Indophenol Blue), sulfate (precipitation with Ba(II)), and iron (complexation with 1,10-phenanthroline with the help of a prior redox reaction for speciation) were selected so that a common manifold could be used for the sequential determination of batches of each analyte. A microcolumn of a suitable ion exchange material was used for on-line preconcentration of each analyte prior to injection; linear ranges for the determination of the analytes at the ng/ml levels were obtained with good reproducibility. The manifold and methods are ready for full automation.

Rapid Determination of Sulfite by Flow Injection Analysis Based on Fuchsin′s Addition

2013 ◽  
Vol 295-298 ◽  
pp. 950-953 ◽  
Author(s):  
Dong Yuan ◽  
Da You Fu ◽  
Wen Yuan Tan
Keyword(s):  
Flow Injection ◽  
Addition Reaction ◽  
Rapid Determination ◽  
Sampling Rate ◽  
Optimum Conditions ◽  
Linear Calibration ◽  
Relative Standard ◽  
Replicate Measurements ◽  
Good Agreement

A rapid spectrophotometric method for flow injection determination of sulfite in tan wastewater is described. The proposed method was based on the addition reaction of sulfite with fuchsin in Na2B4O7-NaOH medium. The optimum conditions allow a linear calibration range of 0.01-1.20 μg ml-1 SO32-. The detection limit is 0.0023μg ml-1 (S/N=3), and the relative standard deviation for night replicate measurements is 1.1% for 0.5μg ml-1 of sulfite. The sampling rate is 60 samples h-1. The procedure has been applied to the determination of sulfite in tan wastewater. The results were in good agreement with those obtained by pararosaniline method.

Determination of lead in whole blood with a simple flow-injection system and computerized stripping potentiometry

1988 ◽  
Vol 209 ◽  
pp. 339-343 ◽  
Author(s):  
L. Almestrand ◽  
M. Betti ◽  
Chi Hua ◽  
D. Jagner ◽  
L. Renman
Keyword(s):  
Flow Injection ◽  
Whole Blood ◽  
Injection System ◽  
Flow Injection System ◽  
Simple Flow

Highly improved sensitivity of TS-FF-AAS for Cd(ii) determination at ng L−1levels using a simple flow injection minicolumn preconcentration system with multiwall carbon nanotubes

2006 ◽  
Vol 21 (11) ◽  
pp. 1305-1313 ◽  
Author(s):  
César Ricardo Teixeira Tarley ◽  
Adriano Francisco Barbosa ◽  
Mariana Gava Segatelli ◽  
Eduardo Costa Figueiredo ◽  
Pedro Orival Luccas
Keyword(s):  
Carbon Nanotubes ◽  
Flow Injection ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Simple Flow

scholarly journals Development of a Simple Reversible-Flow Method for Preparation of Micron-Size Chitosan-Cu(II) Catalyst Particles and Their Testing of Activity

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 1798 ◽  
Author(s):  
Apichai Intanin ◽  
Prawpan Inpota ◽  
Threeraphat Chutimasakul ◽  
Jonggol Tantirungrotechai ◽  
Prapin Wilairat ◽  
...  
Keyword(s):  
Alkaline Solution ◽  
Catalytic Reduction ◽  
Flow System ◽  
Flow Line ◽  
Switching Valve ◽  
Micron Size ◽  
Droplet Production ◽  
The Mean ◽  
Simple Flow ◽  
Representative Samples

A simple flow system employing a reversible-flow syringe pump was employed to synthesize uniform micron-size particles of chitosan-Cu(II) (CS-Cu(II)) catalyst. A solution of chitosan and Cu(II) salt was drawn into a holding coil via a 3-way switching valve and then slowly pumped to drip into an alkaline solution to form of hydrogel droplets. The droplets were washed and dried to obtain the catalyst particles. Manual addition into the alkaline solution or employment of flow system with a vibrating rod, through which the end of the flow line is inserted, was investigated for comparison. A sampling method was selected to obtain representative samples of the population of the synthesized particles for size measurement using optical microscopy. The mean sizes of the particles were 880 ± 70 µm, 780 ± 20 µm, and 180 ± 30 µm for the manual and flow methods, without and with the vibrating rod, respectively. Performance of the flow methods, in terms of rate of droplet production and particle size distribution, are discussed. Samples of 180 µm size CS-Cu(II) particles were tested for catalytic reduction of 0.5 mM p-nitrophenol to p-aminophenol by 100-fold excess borohydride. The conversion was 98% after 20 min, whereas without the catalyst there was only 14% conversion.

Determination of total CO2 in plasma by automated flow-injection analysis.

1979 ◽  
Vol 25 (3) ◽  
pp. 443-445 ◽  
Author(s):  
H Baadenhuijsen ◽  
H E Seuren-Jacobs
Keyword(s):  
Flow Injection ◽  
Flow Injection Analysis ◽  
Indicator System ◽  
Rubber Membrane ◽  
Analysis Technique ◽  
Membrane Technique ◽  
Silicone Rubber Membrane ◽  
Acid Reagent ◽  
Set Up

Abstract We describe a procedure for measuring total CO2 in plasma, based on the principles of the flow-injection analysis technique, which makes use of unsegmented fast-flowing reagent streams, as developed by Růziĉka and co-workers. The further methodological design resembles the silicone-rubber membrane technique of Kenny and Cheng. CO2 in the sample is released by reaction with H2SO4. Appropriate amounts of CO2 permeate through the membrane that separates the acid reagent streams and a buffered cresol-red indicator system. The experimental set-up and functioning of this system are described.

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