Development of a high sensitivity photometric procedure for the determination of vanadium in mineral and fresh waters employing a downsized multicommuted flow analysis approach

2014 ◽  
Vol 6 (24) ◽  
pp. 9667-9674 ◽  
Author(s):  
Tuanne R. Dias ◽  
Jarbas J. R. Rohwedder ◽  
Marcos A. S. Brasil ◽  
Boaventura F. Reis
Keyword(s):  
Analytical Procedure ◽  
Flow Analysis ◽  
High Sensitivity ◽  
Photometric Determination ◽  
Mineral Waters ◽  
Analysis Approach ◽  
Fresh Waters

This article focuses on the development of an analytical procedure for the photometric determination of vanadium in fresh and mineral waters, implemented employing a downsized multicommuted flow analysis approach.

Development of a photometric procedure for tin determination in canned foods employing a multicommuted flow analysis approach

2016 ◽  
Vol 8 (17) ◽  
pp. 3620-3628 ◽  
Author(s):  
Tuanne R. Dias ◽  
Boaventura F. Reis
Keyword(s):  
Analytical Procedure ◽  
Flow System ◽  
Flow Analysis ◽  
Photometric Determination ◽  
Analysis Approach ◽  
Analysis Process ◽  
Tin Determination ◽  
Canned Foods

This work describes an automated analytical procedure for the photometric determination of tin in canned foods, employing a multicommuted flow analysis process. The flow system manifold comprises a set of three-way solenoid valves to handle solutions and a multisyringe module for fluid propelling.

A novel multicommuted flow analysis strategy for the spectrophotometric determination of cadmium in water at μg L−1 levels without using a preconcentration step

2018 ◽  
Vol 10 (8) ◽  
pp. 900-909 ◽  
Author(s):  
Ticiane da Silva Magalhães ◽  
Boaventura F. Reis
Keyword(s):  
Spectrophotometric Determination ◽  
Flow Analysis ◽  
Photometric Determination ◽  
Analysis Approach ◽  
Analysis Strategy

An automated flow analysis approach for the photometric determination of cadmium in water with improved sensitivity is described.

scholarly journals A multicommuted flow analysis method for the photometric determination of amoxicillin in pharmaceutical formulations using a diazo coupling reaction

2011 ◽  
Vol 22 (2) ◽  
pp. 279-285 ◽  
Author(s):  
Sueny K. B Freitas ◽  
Valdinete Lins da Silva ◽  
Alberto N Araújo ◽  
Maria Conceição B. S. M Montenegro ◽  
Boaventura F Reis ◽  
...  
Keyword(s):  
Flow Analysis ◽  
Coupling Reaction ◽  
Pharmaceutical Formulations ◽  
Photometric Determination ◽  
Analysis Method ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction

A Compact Microcontrolled Microfluidic System for Photometric Determination of Phosphate in Natural Water Samples

2015 ◽  
Vol 68 (7) ◽  
pp. 1108 ◽  
Author(s):  
Osmundo Dantas Pessoa-Neto ◽  
Tiago Almeida Silva ◽  
Vagner Bezerra dos Santos ◽  
Orlando Fatibello-Filho
Keyword(s):  
Light Emitting Diode ◽  
Flow Analysis ◽  
Photometric Determination ◽  
Microfluidic System ◽  
Experimental Conditions ◽  
Light Emitting ◽  
Experimental Parameters ◽  
Led Photometer

A compact environmentally friendly microcontrolled microfluidic device ideal for in situ phosphate determination was developed based on a microsystem based on low-temperature co-fired ceramics (LTCC) coupled to a light-emitting diode (LED)–photometer with a multicommutation flow analysis (MCFA) approach. The experimental parameters of the MCFA analyzer were optimized by chemometric studies. Under the best experimental conditions, limits of detection and quantification of 0.02 mg P L–1 and 0.07 mg P L–1, respectively, and a sampling frequency of 67 h–1 were estimated. Moreover, a low sample consumption of only 60 μL per determination was the other advantage that fully meets the requirements of sustainable research and green chemistry purposes.

Development of a new procedure for the determination of captopril in pharmaceutical formulations employing chemiluminescence and a multicommuted flow analysis approach

Luminescence ◽  
2015 ◽  
Vol 31 (1) ◽  
pp. 288-294 ◽  
Author(s):  
Manoel J. A. Lima ◽  
Ridvan N. Fernandes ◽  
Auro A. Tanaka ◽  
Boaventura F. Reis
Keyword(s):  
Flow Analysis ◽  
Pharmaceutical Formulations ◽  
Analysis Approach

Photometric determination of 2-oxoglutaric acid and some other 2-oxo acids by reaction with 3-methyl-2-benzothiazolinone hydrazone

1984 ◽  
Vol 49 (8) ◽  
pp. 1869-1880 ◽  
Author(s):  
Jiří Šafanda ◽  
Pavel Sobotka
Keyword(s):  
Glutamic Acid ◽  
High Sensitivity ◽  
Photometric Determination ◽  
Acid Solutions ◽  
Yellow Colour

2-Oxoglutaric acid reacts with 3-methyl-2-benzothiazoline hydrazone in acid solutions in the presence of FeCl3 to give a stady yellow colour. The method enables the substance to be determined in concentrations as low as 15 μmol l-1 with an accuracy of about 10%. The analysis can be performed in the presence of some additional natural or synthetic 2-oxo acids. The applicability of the method was tested in the determination of the activity of some enzymes involved in the metabolism of 2-oxoglutaric acid. Glutamic acid can be determined after its prior nonenzymatic transamination. A number of 2-oxo acids including 2-oxoglutaric acid can be determined photometrically with a high sensitivity by reaction with 3-methyl-2-benzothiazolinone hydrazone in conditions favouring the formation of blue tetra-aza-pentamethinecyanine dyes. The molar absorptivities largely lay within the region of (2-4.5) . 104 l mol-1cm-1.

Elimination of Aliquoting in Automated Flame Photometric Determination of K2O in Fertilizers

1984 ◽  
Vol 67 (4) ◽  
pp. 847-850
Author(s):  
Layna D Steele ◽  
Kelly J Ramsey ◽  
Peter F Kane
Keyword(s):  
Full Range ◽  
Flow Analysis ◽  
Photometric Determination ◽  
Photometric Method ◽  
Official Method ◽  
Significant Saving ◽  
Large Numbers ◽  
Continuous Flow Analysis ◽  
Automated Instrument

Abstract Current automated instrument systems used in conjunction with the official AOAC flame photometric method for K2O in fertilizer, 2.D06, all require a dilution step to bring the fertilizer extract to the appropriate concentration range. Two CFA (Continuous Flow Analysis) automated instrument systems are described which together eliminate aliquoting over the full range of fertilizer potassium, a significant saving of analyst effort if large numbers of samples are analyzed. The systems have performance characteristics well within the limits in the official method, and produce results comparable to current methods on routine samples.

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