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Endpoint:
other distribution data
Type of information:
other: published data
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
Sodium dodecylbenzenesulfonate (CAS# 25155-30-0 , EC Number; 246-680-4 ) is a very close analogue of Calcium dodecylbenzenesulfonate (CAS No 26264-06-2, EC Number; 247-557-8) ) and read-across is valid.

Data source

Reference
Reference Type:
publication
Title:
Sorption of sodium dodecylbenzene sulfonate by montmorillonite.
Author:
Yang K and Zhu L and Xing B
Year:
2007
Bibliographic source:
Environ. Pollut.145: 571-576.

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Sorption of Sodium dodecylbenzene sulfonate(SDBS) by montmorillonite was determined by a batch technique at room temperature (25 +/-1 deg C) . A total of 20 mL solution containing different amounts of SDBS and 0.50 g of the solid sample with or without NaCl were added to 50 mL Erlenmeyer flasks with glass stoppers and shaken on a gyratory shaker at 150 rpm for 12 h to reach equilibrium. After equilibrium, the solid and the aqueous phases were separated by centrifugation (4000 rpm) for 30 min. The concentrations of SDBS in the aqueous phase were determined by HPLC. The sorption was calculated by the difference from initial and equilibrium SDBS concentrations. For investigating the effect of concentrations of Ca2 + montmorillonite on the sorption of SDBS, the added amounts of solid sample were 0.25 g, 0.50 g and 1.00 g to obtain Ca2?montmorillonite concentrations of 12.5 g/L, 25.0 g/L and 50.0 g/L, respectively. Precipitation between SDBS and Ca2+ was also determined by batch technique at room temperature (25 +/-1 degree C) . A series of solutions, each with the same concentration of CaCl2 but with various SDBS concentrations, were added to 50 mL Erlenmeyer flasks with glass stoppers and shaken on a gyratory shaker at 150 rpm for 12 h. Then, the solid and the aqueous phases were separated by centrifugation (4000 rpm) for 30 min. The concentrations of SDBS in the aqueous phase were analyzed by HPLC. The precipitation quantity was calculated by the difference between initial and equilibrium SDBS concentrations.
GLP compliance:
not specified
Type of study:
other: Sorption
Media:
other: montmorillonite

Test material

Constituent 1
Chemical structure
Reference substance name:
Sodium dodecylbenzenesulfonate
EC Number:
246-680-4
EC Name:
Sodium dodecylbenzenesulfonate
Cas Number:
25155-30-0
Molecular formula:
C18H30NaO3S
IUPAC Name:
sodium dodecylbenzenesulfonate
Test material form:
solid: compact
Details on test material:
Sodium dodecylbenzene sulfonate (SDBS), with a purity of 95%, was purchased from Tokyo Kasei Kogyo Co., and used without further purification. Its average molecular weight is about 349 g/mol. The critical micelle concentration (CMC) of SDBS determined in this study was about 963 mg/L.

Results and discussion

Applicant's summary and conclusion

Conclusions:
Sodium dodecylbenzene sulfonate will tend to partition to positively charged substrates in soils and sediments.
Executive summary:

In this study, batch experiments were conducted to elucidate the sorption of a widely used anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), by montmorillonite. It was observed that: (i) SDBS was sorbed significantly by montmorillonite saturated with Ca2+, but little by Na-saturated montmorillonite; (ii) the amount of SDBS sorbed by Ca2 + montmorillonite was enhanced by NaCl; and (iii) no significant intercalation of SDBS into Ca2+ montmorillonite was observed by X-ray diffraction (XRD) analysis. These results indicate that the removal of SDBS by Ca2+ montmorillonite was primarily attributed to the precipitation between DBS- and Ca2+ in solution which was released from montmorillonite via cation exchange.

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