Improved sequential injection method for phosphate quantification within a wide dynamic range with in-line pre-concentration to monitor soil leachates

Ferreira, Francisca T.S.M.; Mesquita, Letícia S.; Mesquita, Raquel B. R.; Rangel, António O. S. S.

doi:10.1016/j.talo.2020.100015

Cited by 5 publications

(1 citation statement)

References 38 publications

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“…In various publications, the determination of phosphorus in water [4], sediment or soil extracts [2,5] and fertilizer samples [1,7], can be performed by a wide choice of instrumental approaches for example colorimetric batch and automated flow-based systems [4,6,8]. However, these conventional instrumentation methods must operate in the laboratory, require electricity and maintenance not to mention consume large amount of sample and reagent solution hence generate large amount of waste.…”

Section: Introductionmentioning

confidence: 99%

Thread-Based Analytical Device for Determination of Phosphorus Content in Fertilizers

2022

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A simple microfluidic thread-based analytical device (mTAD) for determination of phosphorus content in fertilizers based on the formation of phosphomolybdenum blue (PMB) complex was proposed. The proposed mTAD was simply fabricated by stitching the 100 % cotton thread to the polyethylene (PE) mesh canvas. A color developing reagent, which are the mixture of sulfuric acid, ammonium molybdate, potassium antimony tartrate, and ascorbic acid, was firstly loaded into the middle of the thread. A sample solution was subsequently introduced into the same position to form PMB. A digital camera and image processing program were employed for evaluating color intensity of PMB. Variable parameters affecting the mTAD efficiencies were optimized i.e., solution volumes, chemical concentrations, and reaction time. The applicability of the proposed mTAD method was evaluated by analyzing fertilizer samples. The accuracy as expressed by percentages of recovery ranged between 83 and 96 %. The method was highly reproducible with the relative standard deviation (RSD) of 0.84 % (1 mgP/L), 0.92 % (3 mgP/L) and 1.04 % (10 mgP/L) for 10 replicates. The main features of the system are the used of commonly available materials, simple and rapid fabrication, small scale, reduced chemical waste, less sample consumption, and low-cost. HIGHLIGHTS Simple materials such as 100 % cotton thread and PE mesh canvas can be used for fabricating µTAD The proposed µTAD method was fast analysis and good sensitivity (as low as nmol P level within 6 minutes) by using small amount of reagent and sample solutions The method was successfully determining the phosphorus content in fertilizers GRAPHICAL ABSTRACT

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Section: Introductionmentioning

confidence: 99%

Thread-Based Analytical Device for Determination of Phosphorus Content in Fertilizers

2022

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Aiming to a smart agriculture through the electrochemical impedance of a chitosan-molybdate membrane as a function of available phosphate species

Beltrán-Ortega,

Oropeza-Guzmán,

Calva-Yáñez

2023

J Appl Electrochem

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The identi cation and quanti cation of nutrients in the soil is of great importance in agriculture because plants depend on their presence in the soil or their supply as fertilizer to grow properly. However, there is currently no well-de ned method for quantifying macronutrients in the eld. Therefore, chitosan membranes that have been developed are biocompatible and biodegradable and are applied to stainless steel and carbon inks whose function is to adsorb phosphorus (P) species present in cultivated soils. Studies on Z-potential were carried out on chitosan solutions, varying the pH to measure the surface charge. It was found that as the pH of the solution increased, from 2 to 10, the surface charge decreased until a negative surface charge (from 59.9mV to -5mV). The chitosan/chitosan molybdate membranes were also examined by atomic force microscope (AFM) to observe their roughness and morphology. The chitosan membrane has a smoother appearance than the chitosan-molybdate membrane, con rmed by roughness at the micrometric scale. Electrochemical characterization included electrochemical impedance spectroscopy (EIS) measurements in solutions containing hydrogen phosphide ions HPO 4 = to determine the changes in resistance of the chitosan/chitosan-molybdate membranes. As the ion concentration in the solution increased, the charge transfer resistance (R tc ) decreased. However, when ammonium molybdate was added to the chitosan membrane, it acted as a promoter for the uptake of HPO 4 = by the membrane. Thus, based on their characterization, chitosan biosensors have shown that they are capable of attracting anionic species, which contributes to the minimization of preference zones on the surface of a sensing electrode.

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Radiochemical technique optimization to measure uranium and thorium by α-spectrometry

Fallatah

Qutub

2021

J Radioanal Nucl Chem

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Improved sequential injection method for phosphate quantification within a wide dynamic range with in-line pre-concentration to monitor soil leachates

Cited by 5 publications

References 38 publications

Thread-Based Analytical Device for Determination of Phosphorus Content in Fertilizers

Thread-Based Analytical Device for Determination of Phosphorus Content in Fertilizers

Aiming to a smart agriculture through the electrochemical impedance of a chitosan-molybdate membrane as a function of available phosphate species

Radiochemical technique optimization to measure uranium and thorium by α-spectrometry

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