Sequential injection system exploring the standard addition method for phosphate determination in high salinity samples: interstitial, transitional and coastal waters
2012
Mesquita, Raquel Beatriz Ribeiro | Santos, Inês Carvalho | Bordalo, Adriano Agostinho | Rangel, António Osmaro Santos Silva
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 multi-reflective flow cell coupled to a light emitting diode, enabling the minimization of the schlieren effect. The developed system gave a LOD of 0.3 μmol P L⁻¹ and LOQ of 1.1 μmol P L⁻¹ with a sample consumption of 125 μL. A determination rate of about 30 h⁻¹ was obtained, and the developed method was effectively applied to interstitial, transitional and coastal waters.
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