scholarly journals A potentiometric titration for H2O2 determination in the presence of organic compounds

2013 ◽  
Vol 5 (6) ◽  
pp. 1510 ◽  
Author(s):  
M. P. Gimeno ◽  
M. C. Mayoral ◽  
J. M. Andrés
Keyword(s):  
Potentiometric Titration ◽  
Organic Compounds ◽  
H2o2 Determination

Determination of dissociable acid groups of organic compounds extracted from soils, using automated potentiometric titration

Chemosphere ◽  
1989 ◽  
Vol 19 (8-9) ◽  
pp. 1413-1419 ◽  
Author(s):  
G. Brunelot ◽  
P. Adrian ◽  
J. Rouiller ◽  
B. Guillet ◽  
F. Andreux
Keyword(s):  
Potentiometric Titration ◽  
Organic Compounds

scholarly journals Determination of Fluorine in Organic Compounds by Potentiometric Titration with Aluminum Chloride Solution Combined with Oxygen Flask Combustion.

1998 ◽  
Vol 14 (6) ◽  
pp. 1145-1147 ◽  
Author(s):  
Taketsune MIYAHARA ◽  
Fumitaka OGAI ◽  
Hisayo KITAMURA ◽  
Kusuo NARITA ◽  
Yoshio TAKINO ◽  
...  
Keyword(s):  
Potentiometric Titration ◽  
Organic Compounds ◽  
Aluminum Chloride ◽  
Chloride Solution

Exchangeable aluminium on kaolinite

Soil Research ◽  
1976 ◽  
Vol 14 (1) ◽  
pp. 43 ◽  
Author(s):  
BH Smith ◽  
WW Emerson
Keyword(s):  
Hydrochloric Acid ◽  
Potassium Chloride ◽  
Potentiometric Titration ◽  
Organic Compounds ◽  
Total Charge ◽  
The Third ◽  
Titration Curves ◽  
Isomorphous Replacement ◽  
Nominal Form ◽  
Electro Osmosis

Three salt-free preparations of a ceramic kaolinite were made with different amounts and forms of (Al), where (Al) denotes aluminium ions balancing the isomorphous replacement charge of the clay. In two, (H) clay and (K/H) clay, prepared by washing with hydrochloric acid then water and potassium chloride/hydrochloric acid then water respectively, the (Al) was derived by decomposition of the clay itself. In the third, (Al/OH) clay, a known amount of aluminium together with sufficient alkali was added to give (Al) of the nominal form A1(OH)2.5. Electro-osmosis was used to determine the total charge carried by (Al). The moles of aluminium present as (Al) were estimated by series extraction of aluminium from the clay with potassium chloride/oxalate. Both the charge and the amount of (Al) were deduced from conductimetric titration curves of the clays with alkali. The isomorphous replacement charge of the clay was found to be 3.4 m-equiv./100 g. The average values deduced for the charge per (Al) ion were 3, 1.4 and 0.5 for the (H), (K/H) and (Al/OH) clays respectively. The potentiometric titration curves with alkali of the clays in 1N potassium chloride are discussed in terms of the form of (Al) present. The absorption of organic compounds by salt-free suspensions of kaolinite is also briefly discussed.

The Tempo and mode(S) of Prebiotic Evolution

1997 ◽  
Vol 161 ◽  
pp. 419-429 ◽  
Author(s):  
Antonio Lazcano
Keyword(s):  
Origin Of Life ◽  
Organic Compounds ◽  
Biological Evolution ◽  
Current Evidence ◽  
Early Diversification ◽  
Time Period ◽  
The Galaxy ◽  
History Of ◽  
Widespread Phenomenon ◽  
The Origin Of Life

AbstractDifferent current ideas on the origin of life are critically examined. Comparison of the now fashionable FeS/H2S pyrite-based autotrophic theory of the origin of life with the heterotrophic viewpoint suggest that the later is still the most fertile explanation for the emergence of life. However, the theory of chemical evolution and heterotrophic origins of life requires major updating, which should include the abandonment of the idea that the appearance of life was a slow process involving billions of years. Stability of organic compounds and the genetics of bacteria suggest that the origin and early diversification of life took place in a time period of the order of 10 million years. Current evidence suggest that the abiotic synthesis of organic compounds may be a widespread phenomenon in the Galaxy and may have a deterministic nature. However, the history of the biosphere does not exhibits any obvious trend towards greater complexity or «higher» forms of life. Therefore, the role of contingency in biological evolution should not be understimated in the discussions of the possibilities of life in the Universe.

Sign in / Sign up

Export Citation Format

Share Document