1. College of Chemistry and Materials Science, Guangdong University of Education, Guangzhou 510303, China; 2. Research Center for Environmental Materials and Resource Utilization, Guangdong University of Education, Guangzhou 510303, China; 3. School of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, China
Abstract：The determination of trace amounts of Al (Ⅲ) in domestic water is of great significance for improving the people's quality of life and physical health. In the Hac-NaAc buffer medium at pH 6.80, chromazurine S (CAS) could form a binary complex with Al (Ⅲ). Based on the spectral correction characterization analysis and surface electrostatic potential theory of CAS, the molecular structure of the complex formed by Al (Ⅲ) and CAS was [Al(CAS)2(OH)2]4-. The absorbance of coloring solution and blank solution was measured using the peak-valley wavelengths of complex as the working wavelength, i.e., 566 nm and 422 nm. The absorbance difference (ΔAr) of the Al-CAS (Ⅲ) complex was calculated. The determination method for the trace aluminum by light-absorption ratio variation was established. When the mass concentration of Al (Ⅲ) was in range of 0-0.20 μg/mL, there was a good linear relationship between the mass concentration of Al (Ⅲ) and the value of ΔAr. The limit of detection of method was 0.59 μg/L. The experimental method was used to determine the trace amounts of Al (Ⅲ) in tap water and Tianma River water at the Huadu Campus of Guangdong Second Normal University. The found results were consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). The relative standard deviations (RSD, n=7) were between 0.90% and 2.7%.
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