Incorporation of dithiooxamide as a complexing agent into cellulose for the removal and pre-concentration of Cu(II) and Cd(II) ions from natural water samples

2013 ◽  
Vol 264 ◽  
pp. 368-374 ◽  
Author(s):  
A.O. Jorgetto ◽  
R.I.V. Silva ◽  
M.M. Longo ◽  
M.J. Saeki ◽  
P.M. Padilha ◽  
...  
Keyword(s):  
Natural Water ◽  
Water Samples ◽  
Complexing Agent ◽  
Natural Water Samples

Dual functional rhodamine-immobilized silica toward sensing and extracting mercury ions in natural water samples

2012 ◽  
Vol 41 (9) ◽  
pp. 2620 ◽  
Author(s):  
Wei Huang ◽  
Dayu Wu ◽  
Genhua Wu ◽  
Zhuqing Wang
Keyword(s):  
Natural Water ◽  
Water Samples ◽  
Mercury Ions ◽  
Dual Functional ◽  
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.

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