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Stepanets, Oleg; Solov’eva, G. Yu.; Михайлова, А. Б.; Kulapin, A. I.

doi:10.1023/a:1009470926575

Cited by 19 publications

(8 citation statements)

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“…The found regularities of interface formation were used in practice: surfactant-selective sensors with graphite leads possessing stable operational characteristics were applied to the detection of surfactants in flow systems [21]. Sensors with small-size silver leads were used for the test control over surfactant concentrations in samples of minor volumes on solid supports.…”

Section: Resultsmentioning

confidence: 99%

Some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors

2005

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Surfactants are the major components of highly toxic substances affecting the ecological state of the hydrosphere; concentrations of surfactants are regulated by MPCs. The ability of surfactants to adsorb on surfaces determines their biological activity, which consists in disturbing the function of biological membranes.The control over the concentration of these toxicants in the presence of organic and inorganic substances is complicated by both the variety of surfactant types and wide ranges of their concentrations, namely, from traces in domestic sewage water to tens of per cent in industrial waste water.At present, chromatographic and extraction-spectrophotometric methods are mainly used for determining surfactants. These methods involve the stage of preliminary separation, which makes the analysis longer and demands for toxic solvents [1][2][3][4][5].Selective electrodes with liquid filling [6-8] were proposed for determining surfactants, but in virtue of their construction features, they were inapplicable to the determination of surfactants without preliminary sampling. The replacement of ISE internal solutions with a solid contact between the current lead and the membrane afforded some advantages to solid-contact electrodes (SCEs): they are convenient in service and can be used in any spatial orientation for monitoring technological processes and environmental samples. Some publications were devoted to the application of solid-contact electrodes of the coated-wire type to the potentiometric titration of surfactants [9][10][11]. The main drawbacks of these electrodes are their instability and poor reproducibility of potentials in time.The choice of electronic conductors and the elucidation of the factors responsible for the stability of the electrochemical and operational characteristics of such sensors are important for designing solid-contact, membrane, surfactant-selective electrodes.In this work, some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors with the given electroanalytical and operational characteristics are considered. EXPERIMENTALThe formulae and percentages of the major substances of the surfactant samples under study (anionic (ASs), cationic (CSs), and nonionic (NSs) surfactants) are summarized in Table 1.Solutions of surfactants (1 × 10 -2 -5 × 10 -4 M) were prepared by dissolving their weighed portions in water under slight heating; solutions with concentrations of 1 × 10 -3 to 1 × 10 -6 M were prepared by successive dilution. A 0.01 M solution of sodium tetraphenylborate (Chemapol Co.) with the concentration of the major substance 98.5% was used throughout.Ion pairs of dodecylsulfate and alkylpyridinium cations ( n = 10-18), those of cetylpyridinium with alkylsulfates ( n = 10-16) and tetraphenylborate, as well as compounds of nonylphenol (NP-10, NP-12) or alcohol (Sintanol DS-10) polyethoxylates with ions of barium(II) and tetraphenylborate (NS-Ba-TPB) were used as ionophores. The synthesis of active components of membranes, the preparation...

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Section: Resultsmentioning

confidence: 99%

Some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors

2005

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“…The surfactants in most of the studies mentioned above are toxic and have adverse effects on human health and the environment. , Also, in situ surfactant (alkaline) flooding is considered to cause groundwater contamination when there is a risk of leakage through the reservoir pores. However, it is a highly effective oil recovery technology that can reduce the IFT at the oil–water interface …”

Section: Introductionmentioning

confidence: 99%

“…Recently, environmentally friendly chemicals have drawn attention worldwide as the environmental damage resulting from chemical EOR processes is profoundly severe. − …”

Section: Introductionmentioning

confidence: 99%

Improvement of Heavy Oil Recovery by Nonionic Surfactant/Alcohol Flooding in Light of the Alkane Carbon Number and Interfacial Tension Properties

et al. 2021

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In this work, we prepared nonionic surfactants from waste cooking oil materials. Hydrolysis was carried out for palm and palm kernel waste cooking oils to get a mixture of free fatty acids. The mixture of free acids was esterified with sorbitan and then ethoxylated at different ethylene oxide units. Two surfactants exhibited promising surface-active properties among the six prepared surfactants based on the results of surface tension. The interfacial tension (IFT) around the critical micelle concentration was measured against a series of n-hydrocarbon to detect the minimum alkane carbon number (ACN) (Πmin) for each of these surfactants. The effect of normal and branched alcohols on Πmin was also studied to design the surfactant/alcohol mixture for the chemical flooding process. From the results of IFT, the ethoxylated ester derivatives of palm kernel fatty acids (EPK-20) exhibited minimum IFT γmin (0.06 mN m–1) at Πmin equal to 12, and the ethoxylated ester derivatives of palm fatty acids (EP-40) achieved γmin equal to 0.09 mN m–1 at Πmin of 10. Branched alcohols shifted Πmin to a higher value to reach the equivalent ACN of the crude oil and decrease the IFT to lower values. The flooding process showed that the maximum oil recovery was obtained by EPK-20 (54.2% when used purely and 66.2% when used with isoamyl alcohol). In comparison, EP-40 exhibited that oil recovery equals 46% without alcohol and 46.4% with iso-butanol alcohol. The results were interpreted and discussed based on interfacial properties, wettability alteration, and the ACN.

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“…Up to now, SISEs were primarily used to determine the monomer concentration of cationic or anionic surfactants, phase-transfer catalysts, foods and cosmetics additives in solution, mostly in environmental samples such as wastewater. [101][102][103][104][105][106][107][108][109][110][111] Surfactants, including anionic and cationic surfactants, are widely used both in technological processes and as household cleaners. So, the determination of ionic surfactants in aqueous solutions is very important because of their wide-ranging applications.…”

Section: Applications For the Interactions Of Surfactant Systemsmentioning

confidence: 99%

Surfactantion-selective electrodes: A promising approach to the study of the aggregation of ionic surfactants in solution

Hao

2012

Soft Matter

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Cited by 19 publications

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Some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors

Some regularities of interface formation in solid-contact potentiometric surfactant-selective sensors

Improvement of Heavy Oil Recovery by Nonionic Surfactant/Alcohol Flooding in Light of the Alkane Carbon Number and Interfacial Tension Properties

Surfactantion-selective electrodes: A promising approach to the study of the aggregation of ionic surfactants in solution

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