Sequential injection system exploring the standard addition method for phosphat...

• Author(s): Mesquita, Raquel ; Santos, Inês Carvalho ; Bordalo, Adriano Agostinho ; Rangel, António O. S. S.
• Date: 2012
• Persistent ID: http://hdl.handle.net/10400.14/10024
• Origin: Veritati - Repositório Institucional da Universidade Católica Portuguesa
• Document Type: Article
• Language: English

Description

Technical Note A sequential injection system for phosphate determination within a wide concentration range was developed for water samples with high salinity levels. The determination is based on molybdenum blue chemistry using the standard addition quantification method. The detection system included a multireflective flow cell coupled to a light emitting diode, enabling the minimization of the schlieren effect. The developed system gave a LOD of 0.3 mmol P L 1 and LOQ of 1.1 mmol P L 1 with a sample consumption of 125 mL. A determination rate of about 30 h 1 was obtained, and the developed method was effectively applied to interstitial, transitional and coastal waters.