Qualitative and semi-quantitative determination of chromium(VI) in aqueous solution using 1,5-diphenylcarbazide-loaded foam

Farag, A.B.; El‐Wakil, A. M.; El-Shahawi, M. S.

doi:10.1039/an9810600809

Cited by 18 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Total, acid-extractable Cr was measured using 1,5-DPC as the detection reagent ( Fig. 3c ) ( Farag et al ., 1981 ). The measured intensity was linear with respect to Cr mass with a range between 0.37 and 6 µg and a relative SD of 8.2% among repeated measurements.…”

Section: Resultsmentioning

confidence: 99%

“…To measure Cr(VI) via µPAD, the same protocol could be followed, but tetravalent cerium (Ce(IV)) could be excluded from the pretreatment zone. Tetravalent cerium oxidizes soluble Cr(III) to Cr(VI) for complexation with 1,5-DPC, and thus, in the absence of Ce(IV), only Cr(VI) from the original sample is measured ( Farag et al ., 1981 ). As a result, this method shows promise for measurement of total soluble Cr or soluble Cr(VI).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Rapid Detection of Transition Metals in Welding Fumes Using Paper-Based Analytical Devices

Cate

Nanthasurasak

Riwkulkajorn

et al. 2014

The Annals of Occupational Hygiene

View full text Add to dashboard Cite

Metals in particulate matter (PM) are considered a driving factor for many pathologies. Despite the hazards associated with particulate metals, personal exposures for at-risk workers are rarely assessed due to the cost and effort associated with monitoring. As a result, routine exposure assessments are performed for only a small fraction of the exposed workforce. The objective of this research was to evaluate a relatively new technology, microfluidic paper-based analytical devices (µPADs), for measuring the metals content in welding fumes. Fumes from three common welding techniques (shielded metal arc, metal inert gas, and tungsten inert gas welding) were sampled in two welding shops. Concentrations of acid-extractable Fe, Cu, Ni, and Cr were measured and independently verified using inductively coupled plasma-optical emission spectroscopy (ICP-OES). Results from the µPAD sensors agreed well with ICP-OES analysis; the two methods gave statistically similar results in >80% of the samples analyzed. Analytical costs for the µPAD technique were ~50 times lower than market-rate costs with ICP-OES. Further, the µPAD method was capable of providing same-day results (as opposed several weeks for ICP laboratory analysis). Results of this work suggest that µPAD sensors are a viable, yet inexpensive alternative to traditional analytic methods for transition metals in welding fume PM. These sensors have potential to enable substantially higher levels of hazard surveillance for a given resource cost, especially in resource-limited environments.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Rapid Detection of Transition Metals in Welding Fumes Using Paper-Based Analytical Devices

Cate

Nanthasurasak

Riwkulkajorn

et al. 2014

The Annals of Occupational Hygiene

View full text Add to dashboard Cite

show abstract

“…The second variant is associated with the techniques of thin layer spectrophotometry, which rationally combines the preconcentration of elements on PUF with direct determination of the absorption of light by the solid phase. 53,62,94,185,214,216,230 The essence of the method is in the sorption of coloured compounds by a PUF specimen shaped like a thin parallelepiped with dimensions corresponding to those of the cell (26160.1 cm), transfer of the sorbent into a cell filled with an organic solvent and measurement of the optical density. The solvent serves as an immersion liquid reducing light scattering.…”

Section: Photometrymentioning

confidence: 99%

“…Methods have been reported for determination of bismuth as an iodide complex; 53 cobalt as the thiocyanate; 62 phosphate ions as the reduced form of the molybdophosphoric heteropolyacid; 94 zinc and bismuth, 212 divalent mercury chloride and phenylmercury chloride 216 as dithizonates; and chromium as blue peroxochromic acid and a complex with diphenylcarbazide. 185,230 However, these methods are characterised by relatively narrow ranges of linearity of calibrating plots and relatively low reproducibility of the results.…”

Section: Photometrymentioning

confidence: 99%

Polyurethane foams in chemical analysis: sorption of various substances and its analytical applications

Дмитриенко¹,

Zolotov²

2002

Russ. Chem. Rev.

View full text Add to dashboard Cite

“…El metal que se ha determinado más ampliamente con la DPCI es el Cr (VI), debido a que es un método muy rápido, sencillo y selectivo, cuando el pH se mantiene entre 1-2 para la determinación del Cr (VI), además de la espectrofotometría se han utilizado otras técnicas como la voltamperometría [31 ], cromatografia [32,33] y el análisis de inyección en flujo [34][35][36][37][38].…”

Section: Objetivos Específicosunclassified

Estudio de la especiación del cromo y defenilcarbacida y sus reacciones químicas

Hernández

View full text Add to dashboard Cite

Estudio de la reacción del Cr(VI), Cr(Ill) y Cr(II) con difenilcarbacida, difennilcarbaz.ona y difenilcarbadiaz.on .. 2.2.4 Estudio de la reacción del Cr(VI) con DPCL 2.2.5 Estudio del intermediario en la reacción de Cr (VI) con DPCI CAPITULO 3 RESULTAOOS Y DISCUSIÓN 22 23 23 3.1 .-Estudio cinético y termodinámico de la difenilcarbacida (DPCI) 3 . 1.1 Estudio Cinético 3.1.2 Estudio Termodinámico 3.2 Cá1cu1o de la constante de acidez de la DPCI. 3 .2.1 Determinación de la constante de acidez por el método gráfico, utilizando datos espectrofotométricos. 3.2.2 Método computacional SQUAD. 3.2.3 Programa ACD/pKa predictor CHEMSKETCH versión 4.04 3.3 Estudio Voltamperométrico de la DPCI 3.4 Estudio cinético y termodinámico de la difenilcarbazona (DPCO) 3.5. Estudio voltamperometrico de la DPCO 3.6 Difenylcarbadiazona (DPCOO). CAPITUW 4 ESPECIACIÓN DEL CROMO 4. l Diagramas de distribución de especies para el Cr (VI) 4.2 Estudio espectrofotométrico del cromo 4.3 cromo trivalente y divalente 4.4.-Voltamperométria cíclica del Cr (VI) y Cr (III). 4.4.1.-Comportamiento electroquímico del Cr (VI) 4.4.2.-Comportamiento electroquímico del Cr (III) CAPITUW 5 ESTUDIO DE LA REACCIÓN DEL CROMO CON DIFENYLCARBACIDA, DIFENILCARBAWNA Y DIFENJLCARBADIAWNA. 5.1-Reacción de laDPCI con Cr (VI), Cr(III) y Cr(II). 5.1.1 Reacción de DPCI con Cr (VI) 76 5 .1.2 Reacción de la DPCI con Cr (III) y Cr (II) 5.2 Reacción de la DPCO con Cr (VI), Cr(III) y Cr(II). 5.3 Reacción de la DPCDO con Cr (VI), Cr(III) y Cr(II). 5.4.-Estudio voltamperométrico de la reacción de la DPCI con Cr (VI). CAPITUW 6 ESTUDIO DE LA REDUCCIÓN DEL Cr(VI) CON DPCI 6.1 .-Efecto de la concentración del Cr (VI) y DPCI. 6.1.1-Serie A Se varió la concentración del K 2 Cr 2 0,y se mantuvo constante la concentración de la DPCI. 6.1 .2.-Serie B. Se varió la concentración de la DPCI y se mantuvo constante la concentración del KiCr20, 6.2 Efecto del pH en la reacción de Cr (VI) con DPCI 6.3 Efecto de la temperatura en la reacción de Cr (VI) con DPCI 6.4 Estudio del intermediario en la reacción del Cr (VI) con la DPCI.

show abstract

Qualitative and semi-quantitative determination of chromium(VI) in aqueous solution using 1,5-diphenylcarbazide-loaded foam

Abstract: The detection and determination of low concentrations of chromate ion in aqueous solution are import ant for many purposes, particularly in environmental pollution analyses. Many spot-test reagents have been suggested1 for this purpose.

Cited by 18 publications

References 0 publications

Rapid Detection of Transition Metals in Welding Fumes Using Paper-Based Analytical Devices

Rapid Detection of Transition Metals in Welding Fumes Using Paper-Based Analytical Devices

Polyurethane foams in chemical analysis: sorption of various substances and its analytical applications

Estudio de la especiación del cromo y defenilcarbacida y sus reacciones químicas

Contact Info

Product

Resources

About