Thiomalic acid/ferric chloride-based deep eutectic solvent for microextraction of chromium in natural water samples prior to FAAS analysis

2020 ◽  
pp. 1-9 ◽  
Author(s):  
Mohamed A. Habila ◽  
Eman A. Alabdullkarem ◽  
Zeid A. ALOthman ◽  
Erkan Yilmaz ◽  
Mustafa Soylak
Keyword(s):  
Ferric Chloride ◽  
Natural Water ◽  
Water Samples ◽  
Deep Eutectic Solvent ◽  
Natural Water Samples

Hydrogen Peroxide Decay in Waters with Suspended Soils: Evidence for Biologically Mediated Processes

1990 ◽  
Vol 47 (5) ◽  
pp. 888-893 ◽  
Author(s):  
William J. Cooper ◽  
Richard G. Zepp
Keyword(s):  
Hydrogen Peroxide ◽  
Natural Water ◽  
Water Samples ◽  
First Order ◽  
Natural Water Samples ◽  
Major Reaction Product ◽  
Major Reaction ◽  
Chemical Sterilization ◽  
Pseudo First Order ◽  
Catalyzed Oxidation

Hydrogen peroxide decay studies have been conducted in suspensions of several well-characterized soils and in natural water samples. Kinetic and product studies indicated that the decay was biologically-mediated, and could be described by pseudo first-order rate expressions. At an initial H2O2 concentration of 0.5 μM, the hydrogen peroxide half-life varied from 1 to 8 h. The decay was inhibited by thermal and chemical sterilization of the soils. Peroxidase activity was inferred in several natural water samples, where the suspended particles catalyzed the oxidation of p-anisidine by hydrogen peroxide. The mass spectrum of the major reaction product indicated that it was the dimer, possibly benzoquinone-4-methoxyanil, a product that also was observed from the horseradish peroxidase-catalyzed oxidation of p-anisidine by hydrogen peroxide.

Total reflection X-ray fluorescence spectrometric determination of ultra-trace uranium in natural water samples using a dispersive liquid–liquid micro-extraction method

2020 ◽  
Vol 35 (8) ◽  
pp. 1632-1640
Author(s):  
Vikas Kumar Shukla ◽  
Sangita Dhara ◽  
N. L. Mishra
Keyword(s):  
Natural Water ◽  
Water Samples ◽  
Extraction Method ◽  
Total Reflection ◽  
X Ray ◽  
Natural Water Samples ◽  
Ultra Trace

A total reflection X-ray fluorescence (TXRF) method in conjugation with dispersive liquid–liquid micro-extraction (DLLME) was developed for the determination of uranium present at ultra-trace levels in water samples.

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