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Citation: LIU Sa, LIU Shao-Pu, XIE Li-Sha, HU Xiao-Li, SONG Yan-Qi. Determination of Methylene Blue by a Resonance Light Scattering Technique with Dodecyibenzene Sulfonic Acid Sodiumsalt[J]. Chinese Journal of Applied Chemistry, ;2009, 26(8): 966-970. shu

Determination of Methylene Blue by a Resonance Light Scattering Technique with Dodecyibenzene Sulfonic Acid Sodiumsalt

LIU Sa ^a ,
LIU Shao-Pu ^a ,
XIE Li-Sha ^b ,
HU Xiao-Li ^a,, ,
SONG Yan-Qi ^a

1.
a School of Chemistry and Chemical Engineering, Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, Southwest University, Chongqing 400715;
2.
b Sichuan Entry-Exit Inspection and Quarantine Bureau, Chengdu

Corresponding author: HU Xiao-Li,
Received Date: 19 August 2008
Available Online: 23 November 2008
Fund Project: 国家自然科学基金(20475045) (20475045)发光与实时分析重庆市重点实验室(西南大学)(CSTC,2006CA8006) (西南大学)(CSTC,2006CA8006)重庆市科委自然科学基金计划(CSTC,2007BB1359)资助项目 (CSTC,2007BB1359)

In 0.05 mol/L(pH=1.3) HCl,SDBS combined with methylene blue(MB) to form an ion-association complex with a composition ratio of 2:1 by electrostatic and hydrophobic interactions.As a result,the intensities of RRS,FDS,and SOS spectra were enhanced greatly.The maximum wavelengths of RRS,SOS and FDS were located at 310 nm,648 nm and 341 nm respectively,and the scattering intensities were propo-rtional to the concentration of MB.The detection of MB using these three compounds has very high sensitivities,and the detection limits were 1.2×10^-9 g/mL for RRS,1.4×10^-9 g/mL for SOS and 1.7×10^-9 g/mL for FDS,respectively.At the same time,the methods have better selectivity.Based on the above results,a new spectral method for the determination of trace amounts of MB has been developed.It can be applied to the determination of MB in human serum with a satisfactory result,and the recoveries are 94.4%~103.7%.In this work,the optimum conditions of the reaction and the effects of coexisting substances were investigated.In addition,the reaction mechanism and the reasons of enhancement of resonance light scattering were discussed.
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