Speciation of Selenium Compounds

Pyrzyńska, Krystyna

doi:10.2116/analsci.14.479

Cited by 66 publications

(27 citation statements)

References 50 publications

(59 reference statements)

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“…There has been much recent research interest in vanadium connected with a number of developments concerning industry, the environment, and medicine [1][2][3][4][5][6][7][8][9][10][11]. Vanadium has dual character depending on its concentration; it easily switches between the oxidation states +5 and +4 (which, along with +3, are the oxidation states of naturally occurring vanadium compounds) [1].…”

Section: Introductionmentioning

confidence: 99%

Ternary complexes of vanadium(IV) with 4-(2-pyridylazo)-resorcinol (PAR) and ditetrazolium chlorides (DTC)

Genç

Gavazov²,

Türkyılmaz

2010

Open Chemistry

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Complex formation and liquid-liquid extraction have been studied for ternary complexes of vanadium(IV) with 4-(2-pyridylazo)-resorcinol (PAR) and ditetrazolium chlorides (DTC) in a water-chloroform medium. The specific ditetrazolium compounds investigated were i) 3,3′-(4,4′-biphenylene)-bis(2,5-diphenyl-2H-tetrazolium) chloride (Neotetrazolium chloride, NTC); ii) 3,3′-(3,3′-dimetoxy-4,4′-biphenylene)-bis(2,5-diphenyl-2H-tetrazolium) chloride (Blue Tetrazolium chloride, BTC); and iii) 3,3′-(3,3′-dimetoxy-4,4′-biphenylene)-bis[2-(4-nitrophenyl)-5-phenyl-2H-tetrazolium] chloride (Nitro Blue Tetrazolium chloride, NBT). Molar absorptivity coefficients and the composition of the complexes have been calculated. Association constants (β) have also been obtained for the interactions between the vanadium(IV) — PAR anionic chelates [VO(PAR)2]2− (I) and [VO(OH)2(PAR)2]4− (II), and ditetrazolium cations (DT2+). Some special features of NBT as an extraction-spectrophotometric reagent for vanadium(IV) have been discussed. Unlike NTC and BTC which form complexes with both I and II, NBT associates only with II. The pH interval for complete extraction of (NBT2+)2[VO(OH)2(PAR)2] is broader and allows work at lower pH values the other ion-associates of V(IV,V)-PAR that were studied. NBT is -therefore the appropriate reagent both for direct V(IV) determination and for V(IV)/V(V) separation. Some additional characteristics for the V(IV)-PAR-NBT-water-chloroform system have been determined: extraction constant, distribution constant, recovery factor, limit of detection and limit of quantification. Beer’s law is valid up to 1.4 μg mL−1 vanadium(IV) with molar absorptivity coefficient of 3.55×104 L mol−1 cm−1 at λmax=559 nm.

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Section: Introductionmentioning

confidence: 99%

Ternary complexes of vanadium(IV) with 4-(2-pyridylazo)-resorcinol (PAR) and ditetrazolium chlorides (DTC)

Genç

Gavazov²,

Türkyılmaz

2010

Open Chemistry

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“…3 The main inorganic forms of selenium spread in nature are selenite (SeO3 2-) and selenate (SeO4 2-), but also organic forms could be found mainly as methylated derivatives, selenoaminoacids and selenoproteins. 4 For the reasons pointed out before, the determination of total selenium and its speciation in different kinds of samples is important. Thus, a plethora of analytical methods was proposed, including colorimetry, fluorometry, atomic absorption and emission techniques, potentiometry, voltammetry and chromatography with several kinds of detection.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, a plethora of analytical methods was proposed, including colorimetry, fluorometry, atomic absorption and emission techniques, potentiometry, voltammetry and chromatography with several kinds of detection. 4 On the contrary, proposals referring to screening analysis by using sensor technologies are scarce. Chemical sensors provide information using low-cost technology, mostly without the consumption of reagents and elaborated sample pretreatments.…”

Section: Introductionmentioning

confidence: 99%

A Reflectance Flow-through Thionine Sol-gel Sensor for the Determination of Se(IV)

2010

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“…These methods have been reviewed. [4][5][6][7][8] The hydride generation atomic absorption spectrometry (HGAAS) was usually used for the determination of selenium in urine with a relatively high sensitivity. 9,10 In our previous work, derivative atomic absorption spectrometry (D-AAS) was achieved by combining a laboratory-made derivative measurement system with an atomic absorption spectrometer.…”

Section: Introductionmentioning

confidence: 99%

Determination of Trace Selenium in Urine by Derivative Hydride Generation Atomic Absorption Spectrometry

Sun

Zhang

et al. 2002

ANAL. SCI.

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Speciation of Selenium Compounds

Cited by 66 publications

References 50 publications

Ternary complexes of vanadium(IV) with 4-(2-pyridylazo)-resorcinol (PAR) and ditetrazolium chlorides (DTC)

Ternary complexes of vanadium(IV) with 4-(2-pyridylazo)-resorcinol (PAR) and ditetrazolium chlorides (DTC)

A Reflectance Flow-through Thionine Sol-gel Sensor for the Determination of Se(IV)

Determination of Trace Selenium in Urine by Derivative Hydride Generation Atomic Absorption Spectrometry

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