Open AccessDifluoroboron Curcumin Complex: A Study on Determination of Acidity Constants and Quantitative Analysis of Arsenic(III)
Author(s) -
Nguyêñ Quôć Thǎńg,
Ting An,
Lê Thị Thanh Trân,
Đỗ Tâm Nhân,
Mai Ngoc Tan,
Lê Văn Tán
Publication year - 2021
Publication title -
indonesian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.273
H-Index - 14
eISSN - 2460-1578
pISSN - 1411-9420
DOI - 10.22146/ijc.66990
Subject(s) - chemistry , detection limit , reagent , correlation coefficient , arsenic , dissociation constant , aqueous solution , linearity , curcumin , spectrophotometry , boron , linear correlation , quantitative analysis (chemistry) , chromatography , linear regression , linear range , analytical chemistry (journal) , organic chemistry , biochemistry , statistics , receptor , mathematics , physics , quantum mechanics , machine learning , computer science
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.