Buscar
Mostrando ítems 31-40 de 702
An environmentally friendly flow system for high-sensitivity spectrophotometric determination of free chlorine in natural waters
(ELSEVIER SCIENCE BV, 2010)
A green and highly sensitive analytical procedure was developed for the determination of free chlorine in natural waters, based on the reaction with N,N-diethyl-p-phenylenediamine (DPD). The flow system was designed with ...
Cephalothin: Review of Characteristics, Properties, and Status of Analytical Methods
(Oxford Univ Press Inc, 2021-11-01)
Background: Cephalothin (CET), a first generation cephalosporin, is the most efficient cephalosporin against resistant microorganisms. Many studies found in literature and pharmacopeias propose analytical methods which are ...
Greening microwave-assisted acid digestion of animal feeding samples
(Royal Society of Chemistry, 2019-10)
Nowadays it is well-established that microwave-assisted digestion of organic matrices can be efficiently performed in closed vessels using dilute nitric acid solutions. In this work microwave-assisted sample preparation ...
A green flow-based procedure for fluorimetric determination of acid-dissociable cyanide in natural waters exploiting multicommutation
(SPRINGER HEIDELBERG, 2008)
A flow system designed with solenoid valves is proposed for determination of weak acid dissociable cyanide, based on the reaction with o-phthalaldehyde (OPA) and glycine yielding a highly fluorescent isoindole derivative. ...
A green-analytical chemistry method for agrochemical-residue analysis in vegetables
(Elsevier Science, 2016-09)
Ten agrochemicals, including fungicides, insecticides, herbicides and a plant growth regulator, were quantified at part per billion levels in complex matrices using a green-analytical chemistry (GAC) method. Liquid ...
Ionic liquid-based microextraction techniques for trace-element analysis
(Elsevier, 2014-09)
Ionic liquid-based liquid-liquid microextraction (IL-LLME) techniques are turning into remarkable tools to develop greener sample-preparation methods in analytical chemistry. The application of ILs in LLME is receiving ...
Analytical chemistry assisted by multi-way calibration: A contribution to green chemistry
(Elsevier Science, 2019-11-01)
A review is presented of recent multi-way calibration protocols involving three-, four- andfive-way data. A brief description of the various data structures and processing models isshown, with emphasis on model selection ...
Application of the Principles of Green Chemistry for the Development of a New and Sensitive Method for Analysis of Ertapenem Sodium by Capillary Electrophoresis
(2019-01-01)
An innovative method is validated for the analysis of ertapenem sodium by capillary electrophoresis using potassium phosphate buffer 10 mM pH 7 and 15 kV voltage, in the concentration range of 70 to 120 μg mL-1. Ertapenem ...
Is Thermogravimetry an efficient alternative to gas chromatography in degree of biodiesel conversion?
(2018-05-17)
This work aims to determine if thermogravimetry could be used to determine the degree of conversion of soybean oil to biodiesel without knowing the amount of ester in the sample, comparing the results with the values ...
Estudos de resíduos agroindustriais brasileiros como fonte de compostos de alto valor agregado: métodos verdes para a extração de flavonoides derivados de resíduos de laranja
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Química - PPGQCâmpus São Carlos, 2017-07-07)
Currently, there is a need to increase the research aimed at the recovery of agro-industrial and forest residues worldwide. The food industry has produced an enormous amount of waste globally, among them the citrus waste ...