Photochemistry-based sample treatments as greener approaches for trace-element analysis and speciation

Bendicho, Carlos; Pena, Francisco José Ribadas; Costas, Marta; Gil, Sandra; Lavilla, Isela

doi:10.1016/j.trac.2010.05.003

Cited by 54 publications

(34 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Persulfate has been widely used as radical generator [6] and the involved mechanisms depend on the acidity. In aqueous medium, formation of molecular oxygen and hydrogen sulphate (Eqs.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

“…Chromatographic separations have predominated on speciation analysis, as emphasized in a recent review [6]. Post-column photochemical derivatization is usual to convert organic compounds (e.g.…”

Section: Fractionation and Speciation Analysismentioning

confidence: 99%

“…Aiming at photoreduction, organic species with carbonyl or amino groups [6,11] are generally added to the medium. In spite of its potentiality, this process has been scarcely exploited for analytical purposes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A critical review on photochemical conversions in flow analysis

Rocha

Kamogawa

Rocha

2015

Analytica Chimica Acta

View full text Add to dashboard Cite

“…Persulfate has been widely used as radical generator [6] and the involved mechanisms depend on the acidity. In aqueous medium, formation of molecular oxygen and hydrogen sulphate (Eqs.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Section: Fractionation and Speciation Analysismentioning

confidence: 99%

See 1 more Smart Citation

A critical review on photochemical conversions in flow analysis

Rocha

Kamogawa

Rocha

2015

Analytica Chimica Acta

View full text Add to dashboard Cite

“…This method helps decrease the consumption of relatively expensive and/or unstable chemical reductants such as tetrahydroborate and limit the amount of waste, making this method less costly and "greener" than traditional chemical vapor generation, as illustrated by recent review articles. [6][7][8][9] On the other hand, the direct use of visible light irradiation (UV light, the sun) for sample pre-treatment represents a sustainable technique for sample preparation that does not consume large quantities of chemicals or energy. spectrometric methods allowing Hg determination at < ng L -1 level after reagent-free CV generation is of great interest.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Five Phase Digitally Controlled Rotating Field Plasma Source for Photochemical Mercury Vapor Generation Optical Emission Spectrometry

et al. 2015

View full text Add to dashboard Cite

A new sensitive method for total mercury determination in reference materials using a 5-phase digitally controlled rotating field plasma source (RFP) for optical emission spectrometry (OES) was developed. A novel synergic effect of ultrasonic nebulization (USN) and ultraviolet-visible light (UV-Vis) irradiation when used in combination was exploited for efficient Hg vapor generation. UV-and Vis-based irradiation systems were studied. It was found that the most advantageous design was an ultrasonic nebulizer fitted with a 6 W mercury lamp supplying a microliter sample to a quartz oscillator, converting liquid into aerosol at the entrance of the UV spray chamber. Optimal conditions involved using a 20% v/v solution of acetic acid as the generation medium. The mercury cold vapor, favorably generated from Hg 2+ solutions by UV irradiation, was rapidly transported into a plasma source with rotating field generated within the five electrodes and detected by digitally controlled rotating field plasma optical emission spectrometry (RFP-OES). Under optimal conditions, the experimental concentration detection limit for the determination, calculated as the concentration giving a signal equal to three times the standard deviation of the blank (LOD, 3σblank criterion, peak height), was 4.1 ng mL -1 . The relative standard deviation for samples was equal to or better than 5% for liquid analysis and microsampling capability. The methodology was validated through determination of mercury in three certified reference materials (corresponding to biological and environmental samples) (NRCC DOLT-2, NRCC PACS-1, NIST 2710) using the external aqueous standard calibration techniques in acetic acid media, with satisfactory recoveries. Mercury serves as an example element to validate the capability of this approach. This is a simple, reagent-saving, cost-effective and green analytical method for mercury determination.

show abstract

“…In this work, a new strategy was proposed to remove the residual nickel metal impurities from CNTs by using photochemical vapor generation (PVG); and the produced nickel-containing volatile species was simultaneously introduced to an atomic fluorescence spectrometer (AFS) to measure the nickel atomic fluorescence signal thus online monitoring the purification process. PVG is a new gaseous sample introduction method for analytical atomic spectrometry [36][37][38], with many advantages such as efficient matrix separation, high analyte transport efficiency, high selectivity and simple instrumentation; PVG-AFS has been applied in the detection of trace Fe, Co and Ni [39][40][41][42]. Since Fe, Co and Ni are the most common metal catalysts used in CNT synthesis, herein we proposed to remove nickel impurities from CNTs by the use of PVG, which involved formic acid ultrasonic pretreatment followed with UV-induced carbonyl generation.…”

Section: Introductionmentioning

confidence: 99%