Simultaneous Spectrophotometric Determination of Orthophosphate and Silicate Ions in River Water Using Ion-Exclusion Chromatography with an Ascorbate Solution as Both Eluent and Reducing Agent, Followed by Postcolumn Derivatization with Molybdate

Nakatani, Nobutake; Masuda, Wakako; Kozaki, Daisuke; Gotô, Ryôzô; Nakagoshi, Nobukazu; Mori, Miwako; Hasebe, Kiyoshi; Tanaka, Kazuhiko

doi:10.2116/analsci.25.379

Cited by 14 publications

(7 citation statements)

References 11 publications

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“…The LOD was 0.17 μM for orthosilicate (4.8 ng Si/ml), and the calibration curve was linear up to 10 μM. This LOD was slightly higher than that of the literature (1.0 ng Si/ml) where a molybdenum blue method was used for post‐column detection . However, the sensitivity of the present method should be high enough to determine silica in natural waters except for seawater samples.…”

Section: Resultsmentioning

confidence: 58%

“…Direct analyses of bottled mineral water samples were attempted, but we were not able to obtain reproducible results presumably because of the presence of matrix effects. Thus, IEC was used to separate silica from the sample matrix constituents, according to the procedure of Ikedo et al . The instrumental setup was basically the same as that of Fig.…”

Section: Resultsmentioning

confidence: 99%

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A novel method for determination of inorganic oxyanions by electrospray ionization mass spectrometry using dehydration reactions

et al. 2016

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Novel methods for the determination of inorganic oxyanions by electrospray (ES) ionization mass spectrometry have been developed using dehydration reactions between oxyanions and carboxylic acids at the ES interface. Twelve oxyanions (VO3 (-) , CrO4 (2-) , MoO4 (2-) , WO4 (2-) , BO3 (3-) , SiO3 (2-) , SiO4 (4-) , AsO4 (4-) , AsO2 (-) , SeO4 (2-) , SeO3 (2-) and NO2 (-) ), out of 16 tested, reacted with at least one of four aminopolycarboxylic acids, i.e. iminodiacetic acid (IDA), nitrilotriacetic acid (NTA), trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid and triethylenetetramine-N,N,N',N″,N'″,N'″-hexaacetic acid, at the ES interface to produce the dehydration products that gave intense mass ion responses, sufficient for trace analysis. As examples, trace determinations of Cr(VI) and silica in water samples were achieved after online ion exchange chromatography, where the dehydration product of CrO4 (2-) and NTA (m/z 290) and that of SiO4 (4-) and IDA (m/z 192) were measured. The limits of detection of the respective methods were 17 nM (0.83 ng Cr/ml) for Cr(VI) and 0.17 μM (4.8 ng Si/mL) for SiO4 (4-) .

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

A novel method for determination of inorganic oxyanions by electrospray ionization mass spectrometry using dehydration reactions

et al. 2016

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“…There have been a number of methods for determining orthophosphates in water samples including inductively coupled plasma-optical emission spectrometry (ICP-OES) [2], inductively coupled plasma-mass spectrometry [3], chemiluminescence [4,5], fluorimetry [6,7], capillary electrophoresis [8], voltammetry [9,10], potentiometry [11], and amperometry [12]. However, spectrophotometric methods for phosphate determination are the most widely used [13][14][15][16][17][18][19], often in conjunction with flow injection analysis [20,21] or cyclic injection analysis [22,23]. Most of the methods are indirect and involve determining an element or a molecule associated (in a stoichiometric ratio) with phosphorus in a readily isolated compound.…”

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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“…11 Conversely, IEC coupled with spectrophotometric detection, followed by derivatization with molybdate can be used in conjunction with an ascorbate solution as an eluent for the simultaneous determination of phosphate and silicate with adequate separation. 12 In this previous method, a weak organic acid of ascorbic acid (pKa1 = 4.10) acts as a reducing agent to convert the heteropoly acids formed in the 2011 © The Japan Society for Analytical Chemistry † To whom correspondence should be addressed. ) were conducted using an ion-chromatography system with dual detection of conductivity and spectrophotometry in tandem.…”

Section: Introductionmentioning

confidence: 99%

Ion-exclusion/cation-exchange Chromatography with Dual Detection of the Conductivity and Spectrophotometry for the Simultaneous Determination of Common Inorganic Anionic Species and Cations in River and Wastewater

et al. 2011

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Simultaneous Spectrophotometric Determination of Orthophosphate and Silicate Ions in River Water Using Ion-Exclusion Chromatography with an Ascorbate Solution as Both Eluent and Reducing Agent, Followed by Postcolumn Derivatization with Molybdate

Cited by 14 publications

References 11 publications

A novel method for determination of inorganic oxyanions by electrospray ionization mass spectrometry using dehydration reactions

A novel method for determination of inorganic oxyanions by electrospray ionization mass spectrometry using dehydration reactions

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

Ion-exclusion/cation-exchange Chromatography with Dual Detection of the Conductivity and Spectrophotometry for the Simultaneous Determination of Common Inorganic Anionic Species and Cations in River and Wastewater

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