Assay of Three Kinds of Aluminum Fractions (Ala, Alb and Alc) in Polynuclear Aluminum Solutions by Al-Ferron Timed Spectrophotometry and Demarcation of Their Time Limits
WANG Chen-yi1,2, ZHANG Cai-hua1, BI Shu-ping1*, ZHANG Zhen-chao3, YANG Wei-hua3
1. Department of Chemistry, Nanjing University, Nanjing 210093, China 2. Department of Chemistry, Huzhou Teachers College, Huzhou 31300, China 3. Department of Chemistry, Xuzhou Normal University, Xuzhou 221009, China
Abstract：Al-Ferron timed spectrophotometry assay is a basic method in the study on the formation of polynuclear hydroxyl aluminum species and their transformation laws in aqueous systems. In actual working process, this methodology has some dogmatism and arbitrariness in the time limits demarcation of the three kinds of aluminum fractions (Ala, Alb and Alc) in polynuclear aluminum solutions, which makes this kind of classification rougher, and the experimental results non-reproducible. The reason for this difference is that the specific species within Ala, Alb and Alc have different reaction mechanism and dynamics, and that specific species of Alb having different OH／Al ratios have different reaction rates with ferron. In this paper, the ExpAssoc distribution was applied to quantitatively fit the Al-Ferron reaction dynamics curve, and the extrapolation method was used to survey the 1 min measured value [Ala] of monomeric Al, which is hard to obtain in manual manipulation. The time demarcation between Alb and Alc should reach the point of the experimental data curve up to horizontal platform. The microwave-radiated technology was used to fast assay the total aluminum concentration [AlT]. With these methods, the contents of monomeric Ala, polynuclear Alb and gel Alc can be conveniently and quantitatively measured. It offers a novel method for surmounting the arbitrariness in the measurement of the three kinds of aluminum fractions and the repetitive calculation of Ala and Alb.
Key words：Polynuclear aluminum species;Al-Ferron timed spectrophotometry assay;ExpAssoc distribution;Microwave digest;Time limits demarcaton of Ala;Alb and Alc
王趁义1, 2，张彩华1，毕树平1*，张振超3，杨伟华3 . Al-Ferron逐时络合比色光度法测定聚合铝溶液中Ala, Alb和Alc三种铝形态的时间界限研究 [J]. 光谱学与光谱分析, 2005, 25(02): 252-256.
WANG Chen-yi1,2, ZHANG Cai-hua1, BI Shu-ping1*, ZHANG Zhen-chao3, YANG Wei-hua3 . Assay of Three Kinds of Aluminum Fractions (Ala, Alb and Alc) in Polynuclear Aluminum Solutions by Al-Ferron Timed Spectrophotometry and Demarcation of Their Time Limits. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(02): 252-256.
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