Automated in-chip kinetic-catalytic method for molybdenum determination

Phansi, Piyawan; Henríquez, Camelia; Palacio, Edwin; Nacapricha, Duangjai; Cerdà, Vı́ctor

doi:10.1016/j.talanta.2013.10.046

Cited by 17 publications

(18 citation statements)

References 28 publications

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“…Nevertheless, a narrow range of Mo concentrations is suitable for plants [5]. Consequently, the determination of Mo in plant materials allows foliar diagnosis, providing important information on the amount of fertilizer that should be used [6]. …”

Section: Introductionmentioning

confidence: 99%

A Highly Sensitive Multicommuted Flow Analysis Procedure for Photometric Determination of Molybdenum in Plant Materials without a Solvent Extraction Step

Santos

Reis

2017

Journal of Analytical Methods in Chemistry

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A highly sensitive analytical procedure for photometric determination of molybdenum in plant materials was developed and validated. This procedure is based on the reaction of Mo(V) with thiocyanate ions (SCN−) in acidic medium to form a compound that can be monitored at 474 nm and was implemented employing a multicommuted flow analysis setup. Photometric detection was performed using an LED-based photometer coupled to a flow cell with a long optical path length (200 mm) to achieve high sensitivity, allowing Mo(V) determination at a level of μg L−1 without the use of an organic solvent extraction step. After optimization of operational conditions, samples of digested plant materials were analyzed employing the proposed procedure. The accuracy was assessed by comparing the obtained results with those of a reference method, with an agreement observed at 95% confidence level. In addition, a detection limit of 9.1 μg L−1, a linear response (r = 0.9969) over the concentration range of 50–500 μg L−1, generation of only 3.75 mL of waste per determination, and a sampling rate of 51 determinations per hour were achieved.

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Section: Introductionmentioning

confidence: 99%

A Highly Sensitive Multicommuted Flow Analysis Procedure for Photometric Determination of Molybdenum in Plant Materials without a Solvent Extraction Step

Santos

Reis

2017

Journal of Analytical Methods in Chemistry

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“…8 Later, Cerda proposed a chip-on-valve for the miniaturization of multisyringe flow-injection analysis. 9,10 The analyzer included a special panel equipped by four syringes for one-off moving of the sample and reagent solutions. This panel was coupled with a polymethylmethacrylate (PMMA) plate that contains a serpentine reaction coil for mixing solutions' and an optical channel for absorbance measurements.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Stepwise Injection Spectrophotometric Analyzer

et al. 2015

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“…9 Monolithic ow conductors, called "chips" were rstly used by the authors in the automation of catalytic analytical methods which require temperatures different to the environment for reaction and/or measurement. 18,19 In this work, a fully automated kinetic-catalytic method for Fe and Cu determination is developed. A MPFS coupled to a chip is proposed for the analytical procedure automation and system size reduction, improving the mixing efficiency of the involved reagents and the temperature control in the integrated reaction coil.…”

Section: Introductionmentioning

confidence: 99%