Sensitive Determination of Sulfate in Drinks and Vegetables Digests by Rayleigh Light Scattering Technique
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- 作者：Ting Zhao ; Jiyou Zhang ; Xingguo Cheng ; Xingguo Chen ; and Zhide Hu
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2004
- 出版时间：June 16, 2004
- 年：2004
- 卷：52
- 期：12
- 页码：3688 - 3692
- 全文大小：73K
- 年卷期：v.52,no.12(June 16, 2004)
- ISSN：1520-5118
文摘
In this paper, a novel and sensitive method based on Rayleigh light scattering technique (RLS) wasproposed for the determination of sulfate using a conventional spectrofluorometer. Sulfate wastransformed to BaSO4 particles, which displayed intense light scattering in aqueous solutions. Theeffects of factors such as wavelength, acidity, stabilizers and interferents were studied in detail. TheRLS intensity of the BaSO4 suspension was obtained in 0.1 mol L-1 of [H+] and the addition of 2 mLof cationic polyacrylamide (CPAM) with 7.05 × 10-3 mmol mL-1 charged cations and 1.0 mL of BaCl2·2H2O (5.0%) at 510 nm. In the range of 8-400 
g mL-1, RLS intensity was linear to the concentrationof BaSO4, and the detection limit was 0.3 g mL-1. To determine the feasibility of the proposedmethod, some samples of water, drinks, and vegetables digests were analyzed, and the results werein agreement with the standard turbidimetric method. Good recovery results were also obtained inthe range of 94-105%. Although this method was limited in stability, it was characterized withsimplicity, sensitivity, reliability, and little interference.Keywords: Sulfate determination; Rayleigh light scattering; barium sulfate
g mL-1, RLS intensity was linear to the concentrationof BaSO4, and the detection limit was 0.3 g mL-1. To determine the feasibility of the proposedmethod, some samples of water, drinks, and vegetables digests were analyzed, and the results werein agreement with the standard turbidimetric method. Good recovery results were also obtained inthe range of 94-105%. Although this method was limited in stability, it was characterized withsimplicity, sensitivity, reliability, and little interference.Keywords: Sulfate determination; Rayleigh light scattering; barium sulfate