MULTISITE DETECTION IN FLOW-ANALYSIS .2. MONOSEGMENTED SYSTEMS WITH RELOCATING DETECTORS FOR THE SPECTROPHOTOMETRIC DETERMINATION OF BORON IN PLANTS

• Type: Article in International Scientific Journal
• Date: 1993

Authors

NOGUEIRA, ARA (Author) Other; BRIENZA, SMB (Author) Other; ZAGATTO, EAG (Author) Other; LIMA, JLFC (Author) FFUP; ARAUJO, AN (Author) FFUP

Journal

Title: Analytica Chimica Acta

Vol. 276

Pages: 121-125

ISSN: 0003-2670

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 29 Citations

Scopus - 30 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-001-N5D

DOI: 10.1016/0003-2670(93)85046-m

Abstract (EN): Monosegmented systems with detector relocation are proposed. The sample is injected with an air plug positioned at its tailing portion in order to minimize dispersion. After the peak maximum, the detector is displaced from its original position, allowing the air phase to be discarded without flowing through it. The sample portion inside the detector is either trapped or pushed towards waste. The advantages and limitations of the approach are described, and the need for an optional washing stream is discussed. As an application, an improved system for the spectrophotometric determination of boron in plants is proposed. Four samples are simultaneously processed at a sampling frequency of 120 h-1. With a low reagent consumption (0.52 mg of Azomethine-H per determination), the system yields precise results (R.S.D. < 3%), in agreement with those given by inductively coupled plasma atomic emission spectrometry.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5