Studies on inorganic ion exchangers. Part 5. Preparation, properties and application of antimony(III) arsenate and antimony(III) molybdate

Janardanan, C.; Nair, S. Μ. K.

doi:10.1039/an9901500085

Cited by 10 publications

(6 citation statements)

References 6 publications

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“…This phenomenon is curious given the much greater solubility of potassium antimonyl tartrate in pure water than in combined reagent solutions. In seems likely that the insoluble species being formed is in fact a salt of Sb(III) and molybdate [127] which forms at low [Mo(VI)]/[Sb(III)] ratios, rather than a basic salt as suggested by Murphy and Riley [85]. If a salt of Sb(III) and molybdate is responsible for the Sb(III) solubility issues, it is expected that pH manipulation will be ineffective in dissolving it [127]; dilution should be the preferred course of action.…”

Section: Methods Linearitymentioning

confidence: 99%

The molybdenum blue reaction for the determination of orthophosphate revisited: Opening the black box

Nagul

McKelvie

Worsfold

et al. 2015

Analytica Chimica Acta

334

247

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The molybdenum blue reaction, used predominantly for the determination of orthophosphate in environmental waters, has been perpetually modified and re-optimised over the years, but this important reaction in analytical chemistry is usually treated as something of a 'black box' in the analytical literature. A large number of papers describe a wide variety of reaction conditions and apparently different products (as determined by UV-visible spectroscopy) but a discussion of the chemistry underlying this behaviour is often addressed superficially or not at all. This review aims to rationalise the findings of the many 'optimised' molybdenum blue methods in the literature, mainly for environmental waters, in terms of the underlying polyoxometallate chemistry and offers suggestions for the further enhancement of this time-honoured analytical reaction.

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Section: Methods Linearitymentioning

confidence: 99%

The molybdenum blue reaction for the determination of orthophosphate revisited: Opening the black box

Nagul

McKelvie

Worsfold

et al. 2015

Analytica Chimica Acta

334

247

View full text Add to dashboard Cite

show abstract

“…The presence of arsenic or mercury in food and water above a certain level is a serious threat to public health, and therefore it is very essential to develop fast, sensitive, and selective analytical methods for their detection. Various methods including hydride generation atomic fluorescence spectrometry, inductively coupled plasma atomic emission spectrometry, inductively coupled plasma mass spectrometry, fluorescence spectrophotometry, atomic absorption spectrometry, etc., have been used for the detection of arsenic and mercury. – Although these methods are successful in detecting arsenic and mercury at subpicogram to subnanogram levels, they require expensive instruments, laboratory setup, and high operating cost . The low-cost electrochemical methods, particularly stripping voltammetry, have attracted significant interest for their excellent sensitivity and unique ability to detect the trace levels of elements in distinct oxidation states.…”

mentioning

confidence: 99%

Gold Nanoelectrode Ensembles for the Simultaneous Electrochemical Detection of Ultratrace Arsenic, Mercury, and Copper

2008

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Simultaneous electrochemical detection of As(III), Hg(II), and Cu(II) using a highly sensitive platform based on gold nanoelectrode ensembles (GNEEs) is described. GNEEs were grown by colloidal chemical approach on thiol-functionalized solgel derived three-dimensional silicate network preassembled on a polycrystalline gold (Au) electrode. GNEEs on the silicate network have been characterized by field emission scanning electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy, and electrochemical measurements. Square wave anodic stripping voltammetry (SWASV) has been used for the detection of As(III) and Hg(II) without any interference from Cu(II) at the potentials of 0.06 and 0.53 V, respectively. The GNEE electrode is highly sensitive, and it shows linear response for As(III) and Hg(II) up to 15 ppb. The detection limit (signal-to-noise ratio = 4) of the GNEE electrode toward As(III) and Hg(II) is 0.02 ppb, which is well below the guideline value given by the World Health Organization (WHO). The potential application of the GNEE electrode for the detection of As(III) in a real sample collected from the arsenic-contaminated water in 24 North Parganas, West Bengal is demonstrated. The GNEE electrode has been successfully used for the simultaneous detection of As(III), Cu(II), and Hg(II) at sub-part-per-billion level without any interference for the first time. The nanostructured electrode shows individual voltammetric peaks for As(III), Cu(II), and Hg(II) at 0.06, 0.35, and 0.53 V, respectively. The analytical performance of the GNEE electrode is superior to the existing electrodes.

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“…of polyvalent metals such as Th, Ce, Sb, Ti, Sn, Zr, Fe, Bi, Pb, Al etc. [5][6][7][8][9][10][11] . These exhibit high affinity and selectivity for specific metal ion that made them a prominent tool for separation of that metal ion, in the presence of other competing metal ions with lesser affinity for the exchanger under study.…”

Section: Introductionmentioning

confidence: 99%

Microwave assisted green synthesis and characterization of new phase inorganic ion-exchange materials: bismuth tungstate and stannic arsenate

2023

IJGHC

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Inorganic ion-exchangers are of great interest because of their applications as versatile ion-exchange materials, molecular sieves and promising separation potentialities etc. Synthetic inorganic ion-exchange materials are advanced materials that are superior to their organic counterparts because these are stable in ionizing radiation, elevated temperatures and have high chemical resistivity. Instead of synthesizing these materials by conventional methods, new phases of bismuth tungstate and stannic arsenate inorganic ion-exchangers were obtained by microwaveassisted method, which takes only 5-10 minutes to obtain the crystalline product. Both the materials were characterized by observing their chemical stability, cationexchange capacities (CEC) for various metal ions, effect of heat on CEC, pH titration and FTIR studies.

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Studies on inorganic ion exchangers. Part 5. Preparation, properties and application of antimony(III) arsenate and antimony(III) molybdate

Abstract: Two inorganic ion-exchange materials, antimony(ll1) arsenate and antimony(ll1) molybdate, have been synthesised and characterised. The distribution coefficients of 12 metal ions in de-mineralised water were determined. The order of selectivity was found to be

Cited by 10 publications

References 6 publications

The molybdenum blue reaction for the determination of orthophosphate revisited: Opening the black box

The molybdenum blue reaction for the determination of orthophosphate revisited: Opening the black box

Gold Nanoelectrode Ensembles for the Simultaneous Electrochemical Detection of Ultratrace Arsenic, Mercury, and Copper

Microwave assisted green synthesis and characterization of new phase inorganic ion-exchange materials: bismuth tungstate and stannic arsenate

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