2013
DOI: 10.1021/la4024508
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Anomalies in Solution Behavior of an Alkyl Aminopolycarboxylic Chelating Surfactant

Abstract: The solution behavior of a DTPA (diethylenetriamine pentaacetic acid)-based chelating surfactant, 4-C12-DTPA, has been studied by tensiometry and NMR diffusometry. In the absence of metal ions, the eight donor atoms in the headgroup are titrating, and the charge of the headgroup can thus be tuned by altering the pH. 4-C12-DTPA changes from cationic at very low pH, over a number of zwitterionic species as the pH is increased, and eventually becomes anionic at high pH. Around the isoelectric point, the chelating… Show more

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Cited by 13 publications
(63 citation statements)
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“…This picture becomes even more complex as micelles start to form, since the high charge density at the micellar surface affects the dissociation of surfactants in micelles. 21 A solution of a 4-C 12 -DTPA metal complex is thus already a mixed system, where the different components and mixing ratio depend on the pH. Therefore, when treating mixtures of a 4-C 12 -DTPA metal complex and a foaming agent as a binary mixture, the following limitations are assumed: (i) the metal complex of 4-C 12 -DTPA is defined as the distribution of differently charged species at a specific pH, (ii) the dissociation of the metal complex in the mixed micelles will be affected by the presence of the foaming agent, and thus the mixed micelles may consist of a distribution of species that differs from the distribution in micelles of the metal complex alone, and (iii) the interaction parameter is dominated by the strongest interactions in the systems, and the calculated β parameter primarily describes these interactions.…”
Section: Resultsmentioning
confidence: 99%
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“…This picture becomes even more complex as micelles start to form, since the high charge density at the micellar surface affects the dissociation of surfactants in micelles. 21 A solution of a 4-C 12 -DTPA metal complex is thus already a mixed system, where the different components and mixing ratio depend on the pH. Therefore, when treating mixtures of a 4-C 12 -DTPA metal complex and a foaming agent as a binary mixture, the following limitations are assumed: (i) the metal complex of 4-C 12 -DTPA is defined as the distribution of differently charged species at a specific pH, (ii) the dissociation of the metal complex in the mixed micelles will be affected by the presence of the foaming agent, and thus the mixed micelles may consist of a distribution of species that differs from the distribution in micelles of the metal complex alone, and (iii) the interaction parameter is dominated by the strongest interactions in the systems, and the calculated β parameter primarily describes these interactions.…”
Section: Resultsmentioning
confidence: 99%
“…Since chelating surfactant 4-C 12 -DTPA has eight possible donor atoms that can coordinate to metal ions, the strength of interaction, usually depicted by the conditional stability constant, K, is dependent on the specific metal ion's physical properties and the solution conditions. 19,21,22 Interactions with metal ions of valency higher 22 For instance, for copper and zinc ions, the conditional stability constants with 4-C 12 -DTPA determined at room temperature and pH 5 were log K Cu = 11.9 and log K Zn = 9.9, respectively. In Figure 7, ion flotations of 1 ppm solutions of (a) copper and (b) zinc using DDAO as a foaming agent are shown.…”
Section: Resultsmentioning
confidence: 99%
“…The chelating surfactant 2‐dodecyldiethylenetriaminepentaacetic acid (C 12 ‐DTPA) was delivered by Syntagon AB. The synthesis and analyses have been reported earlier . Diethylenetriaminepentaacetic acid (DTPA), copper sulfate pentahydrate (CuSO 4 ·5H 2 O), sodium sulfate (Na 2 SO 4 ), sodium hydroxide (NaOH), and sulfuric acid (H 2 SO 4 ) were of analytical grade and used without further purification.…”
Section: Methodsmentioning
confidence: 99%
“…Chelating agents have been extensively used to manage the free metal ions in a variety of water‐based industrial processes. Chelating agents can prevent a range of adverse reactions, such as formation of insoluble precipitates, undesired chemical reactions due to heavy metal catalysis, and so on, which otherwise would have detrimental effects on several practical processes . In such processes, industrial effluents typically contain large amounts of heavy metals and chelating agents that are hazardous because of their toxicity and non‐biodegradability .…”
Section: Introductionmentioning
confidence: 99%
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