Elution of 17 alpha 25-Norhopanes and Triaromatic Steroids from Weathered Soils by Mixed Triton X-100/Na2SiO3 Surfactant Solution

作者：Ji Guo dong^*; Zhou Guo hui

来源：Chemical Research in Chinese Universities, 2012, 28(3): 419-423.

• Triton X-100 surfactant solution
• Na2SiO3
• 17 alpha 25-Norhopane
• Triaromatic steroid
• Biomarker

Sodium silicate(Na2SiO3) was used to improve the elution of super heavy oil from weathered soil on an ultrasound-enhanced elution system by the solution containing 0-6000 mg/L surfactant Triton X-100. The removal extent of three markers[C26-34 17 alpha 25-norhopanes, C26-28 triaromatic steroids(TAS), and C27-29 methyl triaromatic steroids(MTAS)] was monitored. The average elution percentages of C26-34 norhopanes, C26-28 TAS, and C27-29 MTAS by Triton X-100/Na2SiO3 solutions were increased by 11%-13%, 9%-11% and 8%-13% with increasing Triton X-100 concentrations from 150 mg/L to 6000 mg/L. All the concentrations of Triton X-100 improved the elution of TAS homologs containing fewer carbon atoms, whereas high concentrations improved the elution of larger 17 alpha 25-norhopane and MTAS species. Addition of Na2SiO3 produced a noticeable increase in elution, particularly for lower-weight species. Scanning electron microscope(SEM) images and energy spectroscopy data reveal that surfactant solution of 6000 mg/L Triton X-100 and 4000 mg/L Na2SiO3 produced the greatest improvement in the elution of super heavy oil aggregates encapsulating the soil surface and the emulsification of particle dispersions. That is to say mixed solutions of Triton X-100 and Na2SiO3 in combination with ultrasound are a potential means of removing super heavy oil from weathered soils.

• 出版日期2012-5
• 单位北京大学