Difluoroboron Curcumin Complex: A Study on Determination of Acidity Constants and Quantitative Analysis of Arsenic(III)


Nguyen Quoc Thang(1), Tran Nguyen Minh An(2), Le Thi Thanh Tran(3), Do Tam Nhan(4), Mai Ngoc Tan(5), Le Van Tan(6*)

(1) Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam
(2) Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam
(3) Chemical and Environmental Science Department, Dalat University, Lam Dong Province, Vietnam
(4) Nuclear Research Institute, Lam Dong Province, Vietnam
(5) Faculty of Retraining and Continuing Education, Dak Nong Community College, Dak Nong Province, Vietnam
(6) Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam
(*) Corresponding Author


In this study, the complex of difluoroboron, curcumin (BF2-Cur), has been synthesized and characterized via the combination of Boron trifluoride-diethyl etherate ((C2H5)2OBF3) and curcumin. However, the new dissociation constants, pKa1 and pKa2 of the BF2-Cur complex, have been indicted by the values of 8.44 ± 0.16 and 9.76 ± 0.13, respectively. On the other hand, the reagent was also used to determine As(III) in aqueous solutions by UV–Vis spectrophotometry. As a result, the method was validated for accuracy, precision, linearity, and sensitivity, and the linear range was from 1.0 to 25.0 µmol/L, with the linear regression, A = 0.0027 C + 0.0106, correlation coefficient R2 = 0.9969. Besides, the limit of detection (LOD) and limit of quantification (LOQ) were determined as 0.83 and 2.10 µmol/L, respectively. Thus, the developed method is successfully used for quantitative analysis of total arsenic in wastewater by reducing As(V) to As(III), then determining As(III) with high accuracy results.


BF2-Cur; total arsenic; UV-Vis spectrophotometry; the conformation of complex; UFF

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DOI: https://doi.org/10.22146/ijc.66990

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