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Citation: QIN Zong-Hui, TAN Rong, PU Li-Jun. Formation Mechanism of Ion-Association Complex of CTAB with Evans Blue or Trypan Blue and Spectrophotometric Analysis of CTAB in Water[J]. Chinese Journal of Applied Chemistry, ;2006, 23(8): 886-891. shu

Formation Mechanism of Ion-Association Complex of CTAB with Evans Blue or Trypan Blue and Spectrophotometric Analysis of CTAB in Water

1.
a Department of Chemistry and Environmental Science, Fuling Normal College, Chongqing 408003;
2.
b Fuling Pharmaceutical Factory, Taiji Group, Chongqing

Corresponding author: QIN Zong-Hui,
Received Date: 25 August 2005
Available Online: 10 November 2005

In a weak acidic NaH₂PO₄-Na₂HPO₄ buffer medium,cetyltrimethyl ammonium bromide(CTAB) reacts with evans blue(EB) or trypan blue(TB) to form an ion-association complex.The colors of solutions fade obviously,and the maximum fading wavelength is at 610 nm and 602 nm,respectively.The absorption intensity decrease is also proportional to the CTAB concentration.Based on this a sensitive spectrophotometric method was developed for the determination of cetyltrimethyl ammonium bromide.In the CTAB concentration range of 0~3.36×10^-5 mol/L(EB-CTAB system) and 0~3.91×10^-5(TB-CTAB system) the UV absorption followed Beer' law at the maximum fading wavelength;the apparent molar absorptivity ε was 1.25×10⁴ L/(mol·cm) and 8.61×10³ L/(mol·cm) respectively,with the detection limit of 7.4×10^-7 mol/L and 9.1×10^-7 mol/L respectively.The method has a high sensitivity and a fairly good selectivity,and was applied to the determination of CTAB in water samples with satisfactory results.In addition,the ion-association complex formation mechanism was studied using the density functional theory method of quantum chemistry,and the result was in good agreement with the experiment data.
- spectrophotometry,
- evans blue,
- trypan blue,
- cetyltrimethyl ammonium bromide,
- density functional theory method
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