Results 211 to 220 of about 23,375 (241)
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Microwave digestion: an analysis of procedures
Analytica Chimica Acta, 1992Abstract Principal component analysis (PCA) and the multicriteria decision making methods, PROMETHEE and GAIA, were used to select a suitable microwave digestion method for metal analysis of soil samples. When the residuals matrix derived from the Cu, Pb, Co, Mn and Zn analyses of 18 different digests of the NBS 2704 SRM, was subjected to PCA and ...
S. Kokot +3 more
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Rapid stopped-flow microwave digestion system
Journal of Analytical Atomic Spectrometry, 1991A prototype system for stopped-flow microwave assisted wet digestions has been developed. A coiled Teflon PFA tube serves both as a sample container and as a digestion vessel. A sample plug, consisting of a water slurry mixed with an acid mixture, is pumped into the coil.
Vassili Karanassios +3 more
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Chemical Oxygen Demand Using Closed Microwave Digestion System
Environmental Science & Technology, 2005A new approach to determine the chemical oxygen demand (COD) using a closed microwave digestion (CMD) system to replace the conventional, time-consuming open reflux (OR) method is proposed. The procedure uses a laboratory-grade closed microwave digestion system (one magnetron) for the digestion of small volume of samples (3.0 mL) in a completely closed
Dattatray M, Dharmadhikari +2 more
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Microwave-Assisted Enzymatic Digestions
2009Despite advances in “top-down” mass spectrometric methods for characterizing proteins, the traditional “bottom-up” approach of digesting a protein into smaller peptides followed by either peptide mass fingerprinting or reverse-phase separation and tandem mass spectrometric identification remains the most widely employed analytical method for protein ...
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Ultrafast Microwave-Assisted In-Tip Digestion of Proteins
Journal of Proteome Research, 2009Trypsin was immobilized on glycidylmethacrylate-co-divinylbenzene (GMA/DVB) polymerized in pipet tips for online enzymatic digestion of proteins. The major advantages of in-tip digestion are easy handling and small sample amount required for analysis. Microwave-assisted digestion was applied for highly efficient and time saving proteolysis. Adaption to
Hans W, Hahn +4 more
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Digestion of Titanium Bearing Geologic Materials Involving Microwaves
Annali di Chimica, 2007AbstractAn environmentally friendly and rapid digestion procedure involving 10 mL of acid mixture (HNO3 : HCl : HF = 2:2:1) for 0.1 g of sample in closed vessel microwave digester following heating program : 250W for 10 min., hold time 2 min., 600 W for 17 min, and Ventilation time 10 min was developed.
Anju, Tripathi, Partha, Chattopadhyay
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Acid digestion of geological and environmental samples using open-vessel focused microwave digestion
Analytical and Bioanalytical Chemistry, 2002The application of open vessel focused microwave acid digestion is described for the preparation of geological and environmental samples for analysis using inductively coupled plasma-mass spectrometry (ICP-MS). The method is compared to conventional closed-vessel high pressure methods which are limited in the use of HF to break down silicates.
Vivien F, Taylor +2 more
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Reflux pre-digestion in microwave sample preparation
The Analyst, 1993In order to prevent excessive pressure rises in closed microwave acid digestion of fairly large (1 g) samples of high organic content, an open-vessel pre-digestion technique under reflux was designed to allow the escape of oxidation products, such as carbon dioxide, without incurring evaporation losses of acid or analytes.
Helen J. Reid +3 more
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Recovery of polonium from microwave bomb digestions
Analytica Chimica Acta, 1994Abstract The use of microwave digestion of plant and animal tissue in preparation for measurement of the volatile element polonium was evaluated. Digestion in concentrated nitric acid in a closed vessel at up to 1380 kPa took up to 2 h. The nitric acid was removed by evaporation in an open beaker and the Po transferred to hydrochloric acid.
P.H. Towler, J.D. Smith
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Communication. Liquid nitrogen cooling in microwave digestion
The Analyst, 1993In an attempt to minimize the delay in opening Teflon pressure vessels following microwave acid digestion, and thus significantly reduce sample preparation time, various approaches to vessel cooling have been investigated. These include the feasibility of carrying out digestions with the pressure vessels immersed in liquid nitrogen and the use of ...
Helen J. Reid +2 more
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