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EC number: 939-479-4 | CAS number: 1471311-60-0
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
The vapour pressure of a commercial sample of Benzenesulfonic acid, 2(or 4)-C10-14-alkyl derivs., compds. with isopropanolamine is <5 Pa at 20°C and 50 °C. All available evidence support the hypothesis that the vapour pressure of the LAS-MIPA salt would be much lower than this measured value. Based on a weight of evidence a value of 0.01 Pa at 25oC is used for the CSR.
Key value for chemical safety assessment
- Vapour pressure:
- 0.01 Pa
- at the temperature of:
- 25 °C
Additional information
The vapour pressure of <5 Pa at 20°C was determined in a reliable study. The vapour pressure of chemical substances is a thermodynamic property. At the boiling point of a liquid substance, the vapour pressure is equal to the (atmospheric) pressure over the liquid. The vapour pressure at different temperatures can be calculated using the Clausius-Clapeyron equation, where the natural log of the vapour pressure is directly proportional to the heat of vaporization of the substance.
The heat of vaporization of the substance can be determined by measuring vapour pressure at (at least) two different temperatures. Since the energy needed for boiling directly determines the boiling point of a substance, the heat of vaporization, at the boiling point, can be estimated from the absolute temperature at the boiling point. Lyman (1982) describes a number of estimation models for predicting the heat of vaporization. With such a model, the vapour pressure at any temperature can be estimated directly from the boiling point, since the vapour pressure at the boiling point is by definition known (i.e. equal to atmospheric pressure). Grain, in Lyman (1982), recommends the Fishtine-Klein method.
The heat of vaporization is not a constant, but varies with temperature. This means that although this approach suffices for estimating vapour pressure at temperatures close to the boiling point (in temperature ranges where the heat of vaporizationcan be assumed to be constant), and therefore for estimating vapour pressure at ambient temperature for low-boiling substances, for substances with a much higher boiling point, the temperature-dependence of the heat of vaporization has to be taken into account. Grain recommends the (modified) Watson approach.
Based on this approach, Grain proposed a method for estimating vapour pressure at temperatureTof organic substances from (measured) boiling point data at atmospheric pressure
With this approach, the vapour pressure of LAS-MIPA at atmospheric pressure and ambient temperature can be estimated, if its boiling point at atmospheric pressure is known. LAS-MIPA decomposes (long) before it reaches boiling point. Reliable studies record decomposition at temperatures > 290°C. Boiling point (BP) is therefore > 290°C.
The boiling point of linear dodecylbenzene, as reported in its SIDS report, is around 280°C; several other sources are available, notably a Wikipedia entry giving 290°C. The BP of linear dodecyl benzene sulfonate, according to supplier Fisher Scientific, is >300–315°C. For linear dodecyl benzene sulfonate, sodium salt, the relevant SIDS report reports decomposition > 444°C. Finally, for linear dodecyl benzene sulfonate, ammonium salt, LookChem reports a BP of 511°C. Although these data are not equally reliable, they collectively support the notion that the BP of LAS-MIPA will be higher than that of LAS or LAS-Na, and that therefore LAS-MIPA BP will be > 444°C.
Using a BP of 444°C to estimate the vapour pressure of LAS-MIPA, the Grain equation results in a value of 4.45E10-9Pa. When using a very conservative value of 315oC, a vapour pressure of 6.94E10-4is obtained. It can therefore be stated that the vapor pressure of LAS-MIPA is very likely lower than 0.01 Pa.
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