Visual colorimetry for determination of trace arsenic in groundwater based on improved molybdenum blue spectrophotometry

Okazaki, Takuya; Kuramitz, Hideki; Hata, Noritake; Taguchi, Shigeru; Murai, Keita; Okauchi, Kanji

doi:10.1039/c4ay03021d

Cited by 29 publications

(21 citation statements)

References 37 publications

(37 reference statements)

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“…Recientemente, Okazaki et al (2015) informaron sobre un dispositivo portátil para la determinación de trazas de As en agua subterránea por colorimetría visual equipado con dos accesorios, un cartucho de CaCO 3 y un soporte de membrana impregnado con molibdeno; con dicho dispositivo se obtuvo un LD de 5 μg/L. La operación del dispositivo fue costosa debido al uso de un cartucho de CaCO 3 junto con filtros de membrana.…”

Section: Resultados Y Discusiónunclassified

Determinación Espectrofotométrica De Especies Inorgánicas Arsenicales (Iii) Y (V) en Agua Usando El Método Del Azul De Molibdeno.

Corral-Escárcega

Miguel-Guerrero

Marciniak

et al. 2019

Rev. Int. Contam. Amb.

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Palabras clave: arsénico, especiación, análisis en agua RESUMEN La contaminación de las aguas superficiales y subterráneas por arsénico ha sido reportada en muchos países en desarrollo. Por esta razón es necesario cuantificarlo utilizando herramientas sencillas y económicas. El principal objetivo de este estudio fue desarrollar un método colorimétrico para la especiación de As-inorgánico en presencia de fósforo (P (V)), en agua. El método se sustentó en la generación de un heteropoliácido de color azul, en medio ácido, por la reacción del molibdato con el arsenato, pero no con el arsenito. Para la cuantificación de As total se utilizó el yodato de potasio (KIO3) para la oxidación cuantitativa del arsénico trivalente (As (III)). Posteriormente, por diferencia del As total y el As (V) se determinó el As (III), restando también la concentración de P (V). Con el uso de la cisteína se cuantificó el P (V) mediante la reducción selectiva del As (V). Este método permitió determinar especies arsenicales inorgánicas en agua salobre incluso a nivel de concentraciones de ultra traza (µg/L), obteniendo los siguientes parámetros de calidad analítica para As (V): límite de detección de 6 μg/L, límite de cuantificación de 18 μg/L, linealidad de 18 a 1600 μg/L; 96.9 % de recuperación y 1.24 % de precisión. Los resultados fueron obtenidos en un menor tiempo sin la utilización de grandes equipos, a bajo costo y comparables con técnicas analíticas instrumentales como la espectrometría de absorción atómica con horno de grafito. ABSTRACTArsenic surface water and groundwater pollution is a reported issue in many developing countries, thus it is of great concern to quantify this species by using economic techniques easy to handle. In this work, a spectrophotometric method for the quantification Rev. Int. Contam. Ambie. 35 (Calidad de agua: salud, remediación y perspectiva) [73][74][75][76][77][78][79][80] 2019

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Section: Resultados Y Discusiónunclassified

Determinación Espectrofotométrica De Especies Inorgánicas Arsenicales (Iii) Y (V) en Agua Usando El Método Del Azul De Molibdeno.

Corral-Escárcega

Miguel-Guerrero

Marciniak

et al. 2019

Rev. Int. Contam. Amb.

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“…For DIC, a custom-built photographic box (6.1×6.1×7.7 inch) modified from previous design 22 was used to eliminate any effects of environmental light. Three replicates were done for each arsenic concentration by placing the tubes at sample holders inside a custom-built photographic box.…”

Section: Colorimetric Test Of Arsenic Using Bf 2 -Cur-film and Quantimentioning

confidence: 99%

“…The average intensities of red, green, and blue colors (RGB values) from 6 images of three replicates (18 values in total) at each arsenic concentration were investigated using a custom-built RGB analysis program. [21][22][23] Each average was used as a single data point to establish calibration curve.…”

Section: Colorimetric Test Of Arsenic Using Bf 2 -Cur-film and Quantimentioning

confidence: 99%

Difluoroboron-Curcumin Doped Starch Film and Digital Image Colorimetry for Semi-Quantitative Analysis of Arsenic

et al. 2020

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This work presents a novel, simple, rapid, and cost effective method for semi-quantitative analysis of arsenic (III) in water sample. The method was based on the digital image colorimetry (DIC) of difluoroboron-curcumin doped starch film (BF 2-cur-film) and arsenic ion in water. A red BF 2-cur-film (9.4 m) was fabricated by entrapped difluoroboron-curcumin (BF 2-curcumin, particle size of 60-113 nm) in tapioca starch film. When the standard solution of arsenic (1 mL) was added into small plastic tube containing BF 2-cur-film on its inner lid, blue solution ( max at 610 nm) was observed instead of orange color in blank solution ( max at 495 nm). When BF 2-cur-film was used in conjunction with DIC, a wide linear range of 0-10 mgL-1 with good linearity (R 2 > 0.99) was obtained from green channel with low detection limit of 0.04 mgL-1. Moreover, good precision (0.9-1.2%RSD, n = 4 days) and accuracy (0.03% relative error) were also achieved.

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“…[7][8][9][10] This technique, which does not use harmful organic solvents, is suitable for on-site works. A direct comparison of the membrane filter colorations provided by the enrichment onto the filter surface enables highly sensitive determination of the target analyte, [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] and some methods are commercially available.…”

Section: Introductionmentioning

confidence: 99%

An Improved Reflection Colorimeter Integrated with a Coaxial Optical-fiber Cable for Highly Sensitive Solid-phase Colorimetry Using a Membrane Filter

et al. 2020

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Highly sensitive solid-phase colorimetry for nickel ion was demonstrated using an improved reflection colorimeter equipped with a coaxial optical-fiber cable. The nickel complex with -furil dioxime was collected on the small-size membrane filter embedded in a disposable syringe filter unit. The leading edge of the optical-fiber cable was connected to the syringe filter unit via Luer-lock fitting, and the color intensity of the sample on the filter was evaluated accurately. The detection limit was 0.8 ng in 2.5 mL of the complex solution (0.3 μg L -1 ). This improved configuration is applicable to highly sensitive on-site analysis without expensive instruments nor high laboratory skills.

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Visual colorimetry for determination of trace arsenic in groundwater based on improved molybdenum blue spectrophotometry

Abstract: A sensitive on-site visual method for determination of trace arsenic in groundwater based on molybdenum blue colorimetry combined with a membrane filtration technique was developed.

Cited by 29 publications

References 37 publications

Determinación Espectrofotométrica De Especies Inorgánicas Arsenicales (Iii) Y (V) en Agua Usando El Método Del Azul De Molibdeno.

Determinación Espectrofotométrica De Especies Inorgánicas Arsenicales (Iii) Y (V) en Agua Usando El Método Del Azul De Molibdeno.

Difluoroboron-Curcumin Doped Starch Film and Digital Image Colorimetry for Semi-Quantitative Analysis of Arsenic

An Improved Reflection Colorimeter Integrated with a Coaxial Optical-fiber Cable for Highly Sensitive Solid-phase Colorimetry Using a Membrane Filter

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