A new approach for determination of orthophosphate based on mixed valent molybdenum oxide/poly 1,2-diaminoanthraquinone in seawater

Abstract

Orthophosphate is an essential macronutrient in natural water that controls primary production and strongly influences the global ocean carbon cycle. Electrochemical determination of orthophosphate is highly recommended because electrochemistry provides the simplest means of determination. Here the determination of orthophosphate based on the formation of a phosphomolybdate complex is reported. Mixed-valent molybdenum oxide (MoxOy) was prepared by cyclic voltammetry on poly-1,2-diaminoanthraquinone (1,2-DAAQ), which was performed by cyclic voltammetry on the surface of a glassy carbon electrode under pre-optimized conditions for the thickness of the modified electrode layers. The proposed modified electrode was used for square-wave voltammetry of orthophosphate ions under pre-optimized square-wave parameters (i.e., frequency and amplitude) in strongly acidic medium (pH < 1). The linear range was 0.05–4 µM with a limit of quantification (LOD) of 0.0093 µM with no effect on two peaks due to cross interference from silicate. Furthermore, MoxOy/PDAAQ shows good reproducibility with a relative standard deviation (RSD) of 2.17% for the peak at 0.035 V and 3.56% for the peak at 0.2 V. Real seawater samples were also analyzed for PO43− analysis by UV spectrophotometry and the results were compared with the measurement results of our proposed electrode, with good recoveries obtained.

AutoGIS processing for site selection for solar pond development as efficient water treatment plants in Egypt

“…This work will contribute to the use of such Python libraries for AutoGIS processing in the cartographic representation of water quality patterns. This could support the cartographic representation of data collected by on-site water quality sensors 21 – 29 recently reported by our group.…”

Phosphate and Nitrate Electrochemical Sensor Based on a Bifunctional Boron-Doped Diamond Electrode

“…This value meets the detection requirements for Class I to Class V water (0.02−0.4 mg/L) as specified in the Chinese national surface water quality standards. 36 The electrochemical sensor based on the BDD electrode has good reproducibility for phosphate detection. The relative standard deviation (RSD) values of the current responses were 2.98, 2.79, 1.66, 1.81, and 1.23%, respectively, for 35 consecutive tests in 0.05, 0.2, 0.5, 1, and 1.5 mg/L phosphate solution (Figure 7A).…”

Accurate and Rapid Determination of Ammonium in Water by Voltametric Analysis on a Novel Modified Electrode

“…[15][16][17][18] The development of these electrodes involved both a laboratory bench and field prototyping. [19][20][21][22][23] This work would help increase investment and further expand reliance on deployable sensors for water quality monitoring. 24 In this study, we employed 1-aminoanthraquinone as a conductive polymer to augment the performance of the electrode.…”