MULTISITE DETECTION IN FLOW-ANALYSIS .3. PERIODATE TUBULAR ELECTRODE WITH LOW INNER VOLUME AS A RELOCATABLE DETECTOR

• Type: Article in International Scientific Journal
• Date: 1994

Authors

NETO, JAG (Author) Other; NOGUEIRA, ARA (Author) Other; BERGAMIN, H (Author) Other; ZAGATTO, EAG (Author) Other; LIMA, JLFC (Author) FFUP; MONTENEGRO, MCBSM (Author) FFUP

Journal

Title: Analytica Chimica Acta

Vol. 285

Pages: 293-299

ISSN: 0003-2670

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 22 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-001-KFK

Abstract (EN): Periodate oxidation was exploited for the determination of sucrose and glycerol with potentiometric monitoring of the remaining periodate. For this task, a tubular electrode with a small inner volume and a fast response time was used in a flow-injection procedure with multi-site detection. With parallel monitoring, two almost identical systems shared the same detection unit. After peak maximum measurement, the detector was displaced to the other analytical channel, and then washing time was no longer a limiting factor with respect to sampling rate. The approach was applied to the determination of glycerol in soaps, detergents and lixivia samples. The sampling rate was improved by 85% relative to a comparable conventional flow-injection system without impairing other favourable analytical characteristics. The reagent consumption was only 190 mu g of NaIO4 per determination. With serial monitoring, measurements were made at two manifold sites under different sample processing conditions. In this way, sucrose was determined in sugar-cane juice and syrups by monitoring the sample zone prior to and after in-line acidic hydrolysis. The proposed system is very stable, no baseline drift being observed during 4-h operation periods. It provides 50 measurements per hour and yields precise results (R.S.D. usually < 2%) in agreement with liquid chromatography. Clarification of the sample is not required.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7