Voltammetric determination of zirconium using azo compounds

Orshulyak, O. O.; Levitskaya, G. D.

doi:10.1134/s1061934808030143

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…Afterwards it was assayed by polarography in magnesium-base alloys with m-nitrobenzoic acid as a selective precipitant for zirconium [12]. The majority of the voltammetric methods for Zr(IV) are related to determinations in ores and alloys [13][14][15][16][17]. Azo-compounds have already received great attention as complexing agents for Zr(IV) determination by voltammetry in many matrices, although they fail for concentrations under the ppb (mg L…”

Section: Resultsmentioning

confidence: 99%

Determination of the Natural Dissolved Concentration of Zirconium in Seawater by Adsorptive Stripping Voltammetry

et al. 2013

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A voltammetric method was developed for zirconium determination as Zr(IV)-cupferron-oxalate-diphenylguanidine complex based on adsorptive accumulation at the HMDE (E peak = À0.95 V). The supporting electrolyte was a mixture of acetate/acetic acid (pH 4.6) and ammonium acetate (pH 5.7) solutions. E ads = À0.6 V (vs. Ag/AgCl), t ads = 400 s, 10 mV s À1 scan rate, and DP mode were the main parameters. The linear range was 0.033 to 3.3 10 À9 mol L À1, and the LOD and LOQ (t ads = 400 s) were 0.77 and 1.6 10 À11 mol L À1, respectively. The method was adequate for seawater samples, although not sufficiently sensitive for surface waters.

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Section: Resultsmentioning

confidence: 99%

Determination of the Natural Dissolved Concentration of Zirconium in Seawater by Adsorptive Stripping Voltammetry

et al. 2013

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Contemporary Use of Azophenolates and Related Species in the Determination of Metal Cations

Ponikvar‐Svet

Liebman

2017

Patai's Chemistry of Functional Groups

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The chapter deals with the contemporary use of azophenolates and related species in the determination of metal ions. Structural variety of azophenolates is discussed. Many of the metals have more than one oxidation state (valence). Only one oxidation state was chosen for each metal (atomic number between 3 and 56) as an example. Principles of the procedures in which azophenolate reagents are used for analytical purposes are described, and important details on individual analytical procedures are listed.

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Determination of Zirconium and Vanadium in Natural Waters by Adsorptive Stripping Voltammetry in the Presence of Cupferron, Oxalic Acid and 1,3‐Diphenylguanidine

et al. 2015

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1IntroductionTheo cean is ad ynamic system operating in different time scales,g overning important global processes,s uch as ore formation, bioproductivity and climate changes.D ue to their extremely low concentrations in seawater, trace elements are the key to understanding many of thesep rocesses.T race elements and their isotopes have been explored as proxies for the movement of aquatic masses [1]. Thep rimarys ourceso fd issolveda nd particulatet race metals into the oceans are dust, riverinei nput and continental shelf, i.e., theiri nputsare controlled by continental sources, whereas hydrothermal fluxes are significant for some elementss uch as Mn, and according to newer studies,even Fe [2,3].Thet ransition metalso fg roups IV and Vare characterized by as mall ionic radius and high charges (typically, tetravalent and pentavalent), and despite their relative immobility during processes of rock formation,i th as been shown that in geological systems involving water, such as seawater, estuaries,a nd marine sediments,t hey could become mobileu nder certain conditions [4][5][6][7][8][9].Zirconium occurs as an egatively charged species,s uch as Zr (OH) [11].Z irconium is grouped as aH igh-Field Strength Element (HFSE),w ith as ignificant tendency towards hydrolysis.Z irconium is strongly particle-reactive and is rapidly depleted from solution by interaction with the surface of sinking particles.T his behaviorl eads to al ow truly dissolved concentration of this element in natural waters and as ignificant effect of particles and colloids in its dissolved concentrations [1,4,5,12]. In contrast to HFSEs, whichtypically have only one oxidation state,v anadiumc an present variable oxidation states,V (IV) and V(V). Different redoxs pecies show different affinitiest owards particles and ligands in solution, leading to variations with respect to their biodisponibility and biogeochemistry reactivity.H ence,r edox conditions represent am ajor control over the distribution of these redox-sensitive trace elements. ForV ,o nly the oxidation state + 5i ss table in oxic waters at an eutral pH [13].T he vanadatea nion species, whicha re completely hydrolyzed, such as HVO 4 2À,H 2VO 4 À and the complexN aHVO 4 À , are predominant [ 13].Voltammetric determinations of Zr(IV) as well as V(V) at trace levels are more properly done as complexes of organic compounds [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].I nap revious paper [29] the adequacy of some of theseligands towards the Zr(IV) determination in natural waters was critically discussed. Thel igand COD showedt he best results for Zr(IV) determination at trace levels.I nt he presents tudy,w ed escribe the sequential determination of Zr(IV) and V(V) in natural waters using adsorptive voltammetric methods based on the accumulation of Zr(IV) and V(V) as cupferron-oxalic acid-1,3-diphenylguanidine (COD) complexes at the HMDE surface.N om ethodu sing the ligandC OD as complexing agent for V(V) was published yet neither individually nor in combinationw ith Zr(IV).Ther...

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Voltammetric determination of zirconium using azo compounds

Cited by 3 publications

References 3 publications

Determination of the Natural Dissolved Concentration of Zirconium in Seawater by Adsorptive Stripping Voltammetry

Determination of the Natural Dissolved Concentration of Zirconium in Seawater by Adsorptive Stripping Voltammetry

Contemporary Use of Azophenolates and Related Species in the Determination of Metal Cations

Determination of Zirconium and Vanadium in Natural Waters by Adsorptive Stripping Voltammetry in the Presence of Cupferron, Oxalic Acid and 1,3‐Diphenylguanidine

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