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Vol. 26 No. 16 (2014): Vol 26 Issue 16

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Cloud-Point Extraction and Fluorospectrophotometric Determination of Rhodamine B in Water Samples

https://doi.org/10.14233/ajchem.2014.16296
Jun-Chen You
Analytical and Testing Center, Shanxi Normal University, Linfen 041004, Shanxi Province, P.R. China
Hao Wu
Analytical and Testing Center, Shanxi Normal University, Linfen 041004, Shanxi Province, P.R. China
Li-Ming Du
Analytical and Testing Center, Shanxi Normal University, Linfen 041004, Shanxi Province, P.R. China
Yun-Long Fu
Analytical and Testing Center, Shanxi Normal University, Linfen 041004, Shanxi Province, P.R. China

Corresponding Author(s) : Li-Ming Du

lmd@dns.sxnu.edu.cn

Asian Journal of Chemistry, Vol. 26 No. 16 (2014): Vol 26 Issue 16

Abstract

A new micelle-mediated cloud point extraction method is described for the sensitive and selective determination of trace amounts of Rhodamine B by fluorospectrophotometry. The method is based on the cloud point extraction of Rhodamine B from aqueous solutions using [sodium dodecyl benzene sulfonate (SDBS)] anionic surfactants in neutral media. The method does not require any organic solvent in the extraction process. The extracted surfactant-rich phase is diluted with methanol and its fluorescence intensity is measured at 547 nm using a fluorospectrophotometer. The effects of different operating parameters such as the concentrations of surfactant and salt, temperature and pH on the cloud point extraction of Rhodamine B are studied and a set of optimum conditions are determined. Under the optimum conditions, a linear calibration graph ranging within 0.02-14 ng/mL of Rhodamine B in the initial solution with r = 0.9992 (n = 5) is obtained. The detection limit based on three times the standard deviation of the blank (3Sb) is 0.006 ng/mL (n = 11) and the relative standard deviation for 10 ng/mL of Rhodamine B is 3.1 % (n = 5). The method is used to detect Rhodamine B in a tap water sample and a contaminated water sample from a dyestuff factory.

Keywords

Rhodamine B Sodium dodecyl benzene sulfonate Cloud-point extraction Spectrofluorometry
You, J.-C., Wu, H., Du, L.-M., & Fu, Y.-L. (2014). Cloud-Point Extraction and Fluorospectrophotometric Determination of Rhodamine B in Water Samples. Asian Journal of Chemistry, 26(16), 5021–5025. https://doi.org/10.14233/ajchem.2014.16296
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