Determination of phosphate, arsenate and arsenite in natural water by flotation-spectrophotometry and extraction-indirect atomic absorption spectrometry using Malachite Green as an ion-pair reagent

Nasu, Toshiko; Kan, Masahiko

doi:10.1039/an9881301683

Cited by 31 publications

(4 citation statements)

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“…Reagent-driven hydrolysis of many other organic P compounds commonly is a major cause of the overestimation of P i [20], but phytate is very recalcitrant against all abiotic hydrolysis known so far. However, many metal ions (such as K, Na, Ca, Al, Mg, Fe, Zn, Fe, As, Si) and anions (NO 3 , Cl, HCO 3 ) react with molybdenum and interfere with the colorimetric results [31][32][33]. While inhibiting concentration for most ions is usually higher than 1-10 mM, the synergistic effect of multiple ions in the solution to inhibit the colorimetric method is not quantified.…”

Section: Comparison Of Phytate Concentration By Colorimetric and Ion Chromatography Methodsmentioning

confidence: 99%

Role of metal complexation on the solubility and enzymatic hydrolysis of phytate

Sun

Jaisi

2021

PLoS ONE

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Phytate is a dominant form of organic phosphorus (P) in the environment. Complexation and precipitation with polyvalent metal ions can stabilize phytate, thereby significantly hinder the hydrolysis by enzymes. Here, we studied the stability and hydrolyzability of environmentally relevant metal phytate complexes (Na, Ca, Mg, Cu, Zn, Al, Fe, Al/Fe, Mn, and Cd) under different pHs, presence of metal chelators, and thermal conditions. Our results show that the order of solubility of metal phytate complexes is as follows: i) for metal species: Na, Ca, Mg > Cu, Zn, Mn, Cd > Al, Fe, ii) under different pHs: pH 5.0 > pH 7.5), and iii) in the presence of chelators: EDTA> citric acid. Phytate-metal complexes are mostly resistant towards acid hydrolysis (except Al-phytate), and dry complexes are generally stable at high pressure and temperature under autoclave conditions (except Ca phytate). Inhibition of metal complex towards enzymatic hydrolysis by Aspergillus niger phytase was variable but found to be highest in Fe phytate complex. Strong chelating agents such as EDTA are insufficient for releasing metals from the complexes unless the reduction of metals (such as Fe) occurs first. The insights gained from this research are expected to contribute to the current understanding of the fate of phytate in the presence of various metals that are commonly present in agricultural soils.

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Section: Comparison Of Phytate Concentration By Colorimetric and Ion Chromatography Methodsmentioning

confidence: 99%

Role of metal complexation on the solubility and enzymatic hydrolysis of phytate

Sun

Jaisi

2021

PLoS ONE

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“…A number of techniques are available now. Most applied environmental studies involve the use of atomic emission spectrometry, hydride generation (HG), graphite furnace, and atomic adsorption (AA) spectrometry (Nasu & Kan 1988;Lamble & Hill 1996;Allinson et al 2000). Inductively coupled plasma-mass spectrometry (ICP-MS) is a sensitive, accurate and precise detection technique (Gong et al 2002;Matera et al 2003).…”

Section: As Speciationmentioning

confidence: 99%

Effect of natural organic matter on arsenic release from soils and sediments into groundwater

Wang

Mulligan

2006

Environ Geochem Health

401

187

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Arsenic (As) contamination in groundwater has received significant attention recently. Natural and anthropogenic sources contribute to the worldwide occurrence of As contamination. As speciation is an important factor related to its toxic and mobile behavior. The release of As from soils and sediments into groundwater is governed by several geophysicochemical processes, of which, As sorption behavior is of principle significance. This review paper summarizes existing information regarding the effects of natural organic matter (NOM) on the fate and mobility of As species in the environment. NOM may enhance the release of As from soils and sediments into the soil solution, thereby facilitating As leaching into the groundwater. The main influencing mechanisms include competition for available adsorption sites, formation of aqueous complexes, and/or changes in the redox potential of site surfaces and As redox speciation. NOM may also serve as binding agents, thereby reducing As mobility. However, comparably little research has been performed on this aspect. Since most investigations have been done on purified minerals under laboratory conditions, further research involving various geological materials under natural environmental conditions is required. Development of proper geochemical conceptual models may provide means of predicting the role of NOM in arsenic leaching and/or immobilization.

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“…Numerous modifications have been proposed to improve sensitivity and selectivity of these methods. One of the alterations is based on ion association reaction between a heteropolyacid (HPA) and a cationic dye, such as Rhodamine B , Rhodamine 6G , or malachite green . However, most of these procedures are time‐consuming and require complicated sample preparation or large volumes of organic solvents and reagents.…”

Section: Introductionmentioning

confidence: 99%

Energy‐Dispersive X‐Ray Fluorescence Spectrometric Determination of Phosphate in Water Samples via a 12‐Molybdophosphate–Crystal Violet Complex

Pytlakowska

2015

CLEAN Soil Air Water

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A simple and eco-friendly procedure for determining total phosphate content in water has been developed by combining a miniaturized ion-associated complex-based preconcentration method with energy-dispersive X-ray fluorescence spectrometry (EDXRF). The method is based on indirect determination of phosphorus using molybdenum present in the ion-associated complex formed by 12-molybdophosphate and crystal violet. Since phosphorus is determined indirectly, via fluorescent radiation of molybdenum, the difficulties stemming from low fluorescence yield and low energy of phosphorus radiation can be successfully overcome. A good mole ratio of phosphorus to molybdenum (1:12) and a sensitive K a line of molybdenum make it possible to determine low phosphorus concentrations. Under optimized conditions, a good linearity (up to 2 mg mL À1 of phosphorus, r ¼ 0.9991), and a detection limit of 1.3 ng mL À1 were achieved. The total relative standard deviation (RSD) for EDXRF determination of phosphorus, following precipitation of the ion-associated complex and its dissolution in a microdrop of 1-hexanol was 2.6%. The enrichment factor was 167. The developed method was used to determine total phosphate content in surface waters. The reliability of the proposed methodology was tested with the use of samples spiked with a known concentration of the determined element and by comparative inductively coupled plasma-optical emission spectrometry. The recovery (in the range of 93.5-97%) was satisfactory and indicates usefulness of the developed procedure.

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Determination of phosphate, arsenate and arsenite in natural water by flotation-spectrophotometry and extraction-indirect atomic absorption spectrometry using Malachite Green as an ion-pair reagent

Cited by 31 publications

References 0 publications

Role of metal complexation on the solubility and enzymatic hydrolysis of phytate

Role of metal complexation on the solubility and enzymatic hydrolysis of phytate

Effect of natural organic matter on arsenic release from soils and sediments into groundwater

Energy‐Dispersive X‐Ray Fluorescence Spectrometric Determination of Phosphate in Water Samples via a 12‐Molybdophosphate–Crystal Violet Complex

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