Extraction of reduced molybdophosphoric and molybdoantimonylphosphoric acids with oxygenated solvents
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Cited by (14)
Portable infrared lightbox for improving the detection limits of paper-based phosphate devices
2021, Measurement: Journal of the International Measurement ConfederationCitation Excerpt :The intensity of the blue product formed is directly proportional to the concentration of phosphate present in the solution with higher concentrations of phosphate producing a darker color. Considerable research has been conducted to improve reagent sensitivity, optimize color intensity and formation time, and decrease interferences from other elements for this phosphate detection method [6,7,8,9,10]. In the past two decades, paper-based devices have become very attractive for making inexpensive, disposable and convenient analytical devices for the determination of reactive phosphate in the field.
Determination of phosphorus in natural waters: A historical review
2016, Analytica Chimica ActaCitation Excerpt :The organic P fraction, which comprises nucleic acids, phosphoproteins and amino phosphoric acids, phospholipids, inositol phosphates, phosphonates and organic condensed P compounds, such as adenosine triphosphate, can be at least as abundant as inorganic P in some natural waters [119,120]. There is compelling evidence that in the absence of orthophosphate, some algae and cyanobacteria can utilise phosphorus from organic P compounds via enzymatic hydrolysis [5,70,121–127]. Consequently there is growing interest in methods for the determination of organic P [128], which hitherto was considered unavailable, and hence was ignored as a source of bioavailable P.
The molybdenum blue reaction for the determination of orthophosphate revisited: Opening the black box
2015, Analytica Chimica ActaCitation Excerpt :However, usage of this term as a comparative measure is often incorrect. All methods which use non-metallic reductants ultimately produce the same product with the same innate molar absorptivity, [H4PMo12O40]3−, or the 2e− reduced species as an intermediate when heating is not used (Fig. 6); differences in apparent absorptivity are simply due to the extent of the reduction process at the time of measurement or the influence of organic solvents [42,56,59]. The molar absorptivities of PMB species can be difficult to determine since quantitative formation of a single PMB species is necessary.
Chapter 37. Phosphorus
2000, Analytical Spectroscopy LibraryCitation Excerpt :The difference in the rates of formation of the phosphomolybdenum- and silicomolybdenum- blues has been utilized for the determination of phosphorus in the presence of silicon [29]. The interference of silicon can be prevented by the use of a sufficiently acidic medium [30] . Oxalic-, tartaric-, and citric acids, and EDTA affect the completeness of reduction of “Mo-P” acid [31].
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