Flow injection potentiometric determination of saccharin in dietary products using a tubular ion-selective electrode

Laboratory Robotics and Automation Pub Date : 1999-08-31 DOI:10.1002/(SICI)1098-2728(1999)11:4<234::AID-LRA9>3.0.CO;2-A

Orlando Fatibello-Filho, Clezio Aniceto

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引用次数: 6

Abstract

The construction and analytical evaluation of a tubular ion-selective electrode coated with an ion pair formed between saccharinate anion and toluidine blue O cation incorporated on a poly(vinylchloride) (PVC) matrix was constructed and adapted in a flow-injection (FI) system. The optimum experimental conditions found were an analytical path of 120 cm, an injection sample volume of 500 μL, a pH of 2.5, a flow rate of 2.3 mL min⁻¹, and a tubular electrode length of 2.5 cm. The linear response to saccharin concentration ranged from 1.0 × 10⁻⁴ to 2.0 × 10⁻² mol L⁻¹, with a slope of −53.1 ± 0.4 mV/decade and a detection limit of 8.0 × 10⁻⁵ mol L⁻¹. The analytical frequency was 40 determinations h⁻¹, and this system was used with success for saccharin determination in several dietary products. © 1999 John Wiley & Sons, Inc. Lab Robotics and Automation 11: 234–239, 1999

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用管状离子选择电极流动注射电位法测定膳食产品中的糖精

在流动注射(FI)系统中，构建了一种由糖精阴离子和甲苯胺蓝O离子组成的离子对包覆在聚氯乙烯(PVC)基体上的管状离子选择电极，并对其进行了分析评价。最佳实验条件为分析路径为120 cm，进样量为500 μL, pH为2.5，流速为2.3 mL min - 1，管状电极长度为2.5 cm。对糖精浓度的线性响应范围为1.0 × 10−4 ~ 2.0 × 10−2 mol L−1，斜率为- 53.1±0.4 mV/ 10年，检出限为8.0 × 10−5 mol L−1。分析频率为40个h−1，该系统已成功用于多种食品中糖精的测定。©1999 John Wiley &儿子,Inc。机械工程学报，2009,31 (2):444 - 444

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Laboratory Robotics and Automation

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