✦ LIBER ✦

Multi-component analysis in solution using piezoelectric quartz sensors: Part II. Determination of aspirin and salicylic acid in aqueous solutions

✍ Scribed by Wanzhi Wei; Lihua Nie; Shouzhou Yao

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 504 KB
Volume: 263
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(92)85428-9

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✦ Synopsis

Based on the linear relatlonshlp between the conductwlty of an aqueous solution and the plezoelectnc quartz sensor frequency, it was derived that under certam expenmental condltlons the frequency shift should show a hnear dependence on concentration for common acids and asplrm Thus venfied expenmentally A cahbratlon model for the simultaneous determmatlon of asplnn (ASA) and sahcyhc acid @A) was estabhshed The usefulness of the technique was evaluated by the analysis of murtures of known composition usmg a P-matnx cahbratlon method The average relative errors were 0 81% for ASA and 163% for SA

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Multi-component analysis in solution using piezoelectric quartz sensors: Part I. Determination of o-cresol and m-cresol in water

✍ Wanzhi Wei; Zhihong Mo; Shouzhuo Yao 📂 Article 📅 1991 🏛 Elsevier Science 🌐 English ⚖ 501 KB

An array of four piezoelectric crystals, each working at a certain pH, was constructed for the simultaneous determination of o-and m-cresol in water. As there are differences in the reaction of o-and m-cresol with iodine under different pH conditions and because iodine in water can be adsorbed by qu