Multi-syringe flow injection system with in-line microwave digestion for the d...

• Author(s): Almeida, M. Inês G.S. ; Segundo, Marcela A. ; Lima, José L.F.C. ; Rangel, António O.S.S.
• Date: 2004
• Persistent ID: http://hdl.handle.net/10400.14/3515
• Origin: Veritati - Repositório Institucional da Universidade Católica Portuguesa
• Subject(s): Multi-syringe flow analysis; Total phosphorus; Microwave; In-line digestion; Waste waters
• Document Type: Article
• Language: English

Description

A multi-syringe system for spectrophotometric determination of total phosphorus involving in-line digestion is proposed. Sample and digestion solution were dispensed and directed towards a digestion vessel located inside a domestic microwave oven (MWO) where sample digestion took place. Afterwards, the digested sample was merged with the necessary reagents for the colorimetric determination based on the molybdenum blue method. Several digestion conditions were studied regarding composition of digestion solution, digestion time and power set on theMWO. The system was applied to waste water samples and results shown a good agreement with the reference method. Repeatable results (R.S.D. < 2.41%) and determination frequency of 12 h−1 were obtained.