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.

Reaction of metallic nitrilotriacetates with histamine

1969 ◽  
Vol 47 (8) ◽  
pp. 1269-1273 ◽  
Author(s):  
A. L. Beauchamp ◽  
J. Israeli ◽  
H. Saulnier
Keyword(s):  
Potentiometric Titration ◽  
Formation Constants ◽  
Amino Group ◽  
Mixed Complex ◽  
Ph Values ◽  
Titration Curves ◽  
Terminal Amino ◽  
Complex Ion

Cu(II), Ni(II), Co(II), and Zn(II) nitrilotriacetates (MeX−) react with histamine nitrate (LH+) to form a protonated mixed complex MeXLH where the metal appears to be bound only to the tertiary imidazolic nitrogen of histaminium ion. At higher pH values the proton dissociates to yield a mixed complex ion MeXL− in which both the imidazolic nitrogen and the terminal amino group are coordinated. The formation constants of these species were calculated from the potentiometric titration curves.

scholarly journals Assessment of Two Theoretical Methods to Estimate Potentiometric Titration Curves of Peptides:  Comparison with Experiment

2006 ◽  
Vol 110 (9) ◽  
pp. 4451-4458 ◽  
Author(s):  
Joanna Makowska ◽  
Katarzyna Bagiñska ◽  
Mariusz Makowski ◽  
Anna Jagielska ◽  
Adam Liwo ◽  
...  
Keyword(s):  
Potentiometric Titration ◽  
Theoretical Methods ◽  
Titration Curves ◽  
Comparison With Experiment

Corrosion inhibition of some azole derivatives on carbon steel in hydrochloric acid solution

2014 ◽  
Vol 61 (5) ◽  
pp. 300-306 ◽  
Author(s):  
B.P. Markhali ◽  
R. Naderi ◽  
M. Sayebani ◽  
M. Mahdavian
Keyword(s):  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Organic Compounds ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Acid Corrosion ◽  
Molecular Structures ◽  
Inhibition Mechanism ◽  
Content Type

Purpose – The purpose of this paper is investigate the inhibition efficiency of three similar bi-cyclic organic compounds, namely, benzimidazole (BI), benzotriazole (BTAH) and benzothiazole (BTH) on carbon steel in 1 M hydrochloric acid (HCl) solution. Organic inhibitors are widely used to protect metals in acidic media. Among abundant suggestions for acid corrosion inhibitors, azole compounds have gained attention. Design/methodology/approach – The inhibition efficiency of the three organic compounds was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Findings – Superiorities of BTH and BTAH corrosion inhibitors were shown by EIS data and polarization curves. Moreover, the results revealed that BTAH and BTH can function as effective mixed-type adsorptive inhibitors, whereas no inhibition behavior was observed for BI. Both BTAH and BTH obeyed Longmuir adsorption isotherm. The results obtained from this isotherm showed that both inhibitors adsorbed on the specimen surface physically and chemically. The difference in inhibition efficiencies of BTAH, BTH and BI was related to the presence of nitrogen and sulfur hetero atoms on their molecular structures. Originality/value – This study evaluated inhibition efficiency of BI, BTAH and BTH using electrochemical methods. In addition, the study attempted to find inhibition mechanism of the inhibitors and to find modes of adsorption of the inhibitors, correlating effects of heteroatoms and inhibition efficiency.

The Technology Demonstration of the Third Generation JPL Electronic Nose on the International Space Station

2012 ◽  
pp. 275-295 ◽  
Author(s):  
Abhijit V. Shevade ◽  
Margie L. Homer ◽  
Adam K. Kisor ◽  
Shiao-Ping S. Yen ◽  
Liana M. Lara ◽  
...  
Keyword(s):  
International Space Station ◽  
Organic Compounds ◽  
Electronic Nose ◽  
Space Station ◽  
Chemical Species ◽  
Third Generation ◽  
Short Term ◽  
International Space ◽  
The Third ◽  
Technology Demonstration

This chapter describes the development, operation, and experimental results of the Third Generation JPL Electronic Nose (ENose), which operated on board the International Space Station (ISS) as a technology demonstration for seven months from 2008-2009. The JPL ENose is an array of chemiresistive sensors designed to monitor the environment for the sudden release of targeted chemical species, such as leaks or spills. The Third Generation JPL ENose was designed to detect, identify, and quantify eleven chemical species, three inorganic, ammonia, mercury, and sulfur dioxide, and eight organic compounds, which represent common classes of organic compounds such as alcohols, aromatics, and halocarbons. Chemical species were quantified at or below their 24 hour Spacecraft Maximum Allowable Concentrations (SMAC), generally in the parts-per-million range; some targeted species were detected in the parts-per-billion range. Analysis of third generation JPL ENose monitoring data on ISS show the short term presence of low concentrations of alcohols, octafluoropropane, and formaldehyde as well as frequent short term unknown events. Repeated unknown events were identified post-flight as sulfur hexafluoride.

Potentiometric titration curves for lubricants

1977 ◽  
Vol 13 (3) ◽  
pp. 213-216 ◽  
Author(s):  
V. S. Luneva ◽  
T. V. Pavlova
Keyword(s):  
Potentiometric Titration ◽  
Titration Curves

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
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