Flow-Injection Spectrophotometric Determination of Mercury(II) in Water by the Catalytic Decomposition of Ferrocyanide

Feng, Yong-Lai; Narasaki, Hisatake; Tian, Lianhua; Wu, Sao-Ming; Chen, Hong‐Yuan

doi:10.2116/analsci.15.915

Cited by 23 publications

(14 citation statements)

References 18 publications

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“…The catalytic effect of low [Ag + ] can also be visualized by the above-suggested mechanism if the ratedetermining step is considered to be the decomposition of the activated complex through Eq. (12). …”

Section: Effect Of Temperature and Ionic Strength On Initial Ratesmentioning

confidence: 99%

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The silver(I)‐catalyzed exchange of coordinated cyanide in hexacyanoferrate(II) by phenylhydrazine in aqueous medium

Naik

Tiwari

Singh

et al. 2007

Int J of Chemical Kinetics

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5 PhNHNH 2 ] formed during the course of reaction has been found to be 1:1 using the mole ratio method. The evaluated values of activation parameters for the catalyzed reaction are E a = 53.85 kJ mol −1 , H = = 51.33 kJ mol −1 , and S = = −134.63 J K −1 mol −1 , which suggest an interchange dissociative mechanism. A most plausible mechanistic scheme has been proposed based on the experimental observations.

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Section: Effect Of Temperature and Ionic Strength On Initial Ratesmentioning

confidence: 99%

“…On the contrary, there is not much information on the kinetics and mechanism of metalcatalyzed substitution in hexacyanoferrate(II). Most of the investigators [12][13][14] have dealt with specific analytical applications [12,15,16] rather than obtaining a complete understanding of the mechanism of the substitution in hexacyanoferrate(II).…”

Section: Introductionmentioning

confidence: 99%

The silver(I)‐catalyzed exchange of coordinated cyanide in hexacyanoferrate(II) by phenylhydrazine in aqueous medium

Naik

Tiwari

Singh

et al. 2007

Int J of Chemical Kinetics

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“…The kinetic determination of ultra trace quantities of inorganic ions have been the subject of interest of several investigators [5][6][7][8][9][10][11][12][13][14] including our group [15][16][17][18]. A complexing agent added to a metal ion-catalyzed reaction may alter the catalytic activity of the catalyst through the formation of strong complexes with metal catalysts, resulting either in ligand inhibition or rate promotion [5].…”

Section: Introductionmentioning

confidence: 99%

Kinetic determination of trace amounts of thiosulfate based on its inhibitory effect

Tiwari

Naik

Singh

et al. 2009

JICS

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The sulfur containing ligand viz., thiosulfate is found to inhibit the Ag(I) catalyzed substitution of cyanide in hexacyanoferrate(II) by phenylhydrazine. The inhibitory effect of thiosulfate is attributed due to its tendency to form complexes with Ag(I), leading to the production of inhibitor-catalyst complexes. The reactions, followed spectrophotometrically in aqueous medium at 488 nm, was possible by the increase in absorbance of the cherry-red product, [Fe(CN) 5 PhNHNH 2 ] 3-at pH 2.8 (±0.02), at 30 (±0.1) °C, and an ionic strength (μ) of 0.02 M (KNO 3 ). The linear calibration curves were obtained using the absorbance measured at different times (A t ) and thiosulfate concentrations under specified conditions. The calculated detection limit was 4.9 × 10 -7 M. The Michaelis-Menten constant (K m ) and equilibrium constants for the formation of complexes between catalyst and inhibitor (K CI ), and the catalyst and substrate (K S ) were computed from the kinetic data. A general mechanistic scheme is proposed for this reaction.

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“…For this reason, a wide variety of spectrophotometric methods for the determination of mercury have been reported. [9][10][11][12][13][14][15][16][17][18][19] Each chromogenic system has its advantages and disadvantages with respect to sensitivity, selectivity and analysis speed.…”

Section: Introductionmentioning

confidence: 99%

Solid phase extraction and spectrophotometric determination of mercury in tobacco and tobacco additives with 5-(p-aminobenzylidene)-thiothiorhodanine

Weizhu¹,

Hu²,

Ma³

et al. 2006

J. Braz. Chem. Soc.

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Foi desenvolvido um método altamente sensível, seletivo e rápido para a determinação de mercúrio, a partir da reação rápida de mercúrio(II) com 5-(p-aminobenzilideno)-tiorodanina (ABTR) e posterior extração em fase sólida do quelato colorido, utilizando discos C 18 . Em pH 3,5 e na presença do emulsificante-OP, ABTR reage com mercúrio(II) para formar um quelato vermelho na razão molar 1:2 (mercúrio:ABTR). O quelato foi enriquecido pela extração em fase sólida com discos C 18 e o quelato retido, eluído com dimethyl formamida (DMF). Um fator de enriquecimento na ordem de 50 foi obtido. Em DMF, a absortividade molar do quelato é 1,21×10 5 L mol -1 cm -1 a 545 nm, e a lei de Beer é obedecida no intervalo 0,01~3 μg mL -1 na solução medida. O desvio padrão relativo para onze replicatas a 0,01 μg mL -1 é 1,7%. Este método foi aplicado para a determinação de mercúrio em tabaco e aditivos de tabaco. Bom coeficiente de preconcentração foi encontrado, comparando-se o método proposto com outros similares.A highly sensitive, selective and rapid method for the determination of mercury based on the rapid reaction of mercury(II) with 5-(p-aminobenzylidene)-thiorhodanine (ABTR) and the solid phase extraction of the colored chelate with C 18 disks has been developed. At pH 3.5 and in the presence of emulsifier-OP medium, ABTR reacts with mercury(II) to form a red chelate of a 1:2 (mercury to ABTR) molar ratio. This chelate was enriched by solid phase extraction with C 18 disks and the retained chelate eluted form the disks with dimethyl formamide (DMF). An enrichment factor of 50 was achieved. In the DMF medium, the molar absorptivity of the chelate is 1.21×10 5 L mol -1 cm -1 at 545 nm, and Beer's law is obeyed in the 0.01~3 μg mL -1 range in the measured solution. The relative standard deviation for eleven sample replicate measurements at the 0.01 μg mL -1 level is 1.7%. This method was applied to the determination of mercury in tobacco and tobacco additives and good preconcentration was found between proposed and comparative methods results.

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Flow-Injection Spectrophotometric Determination of Mercury(II) in Water by the Catalytic Decomposition of Ferrocyanide

Cited by 23 publications

References 18 publications

The silver(I)‐catalyzed exchange of coordinated cyanide in hexacyanoferrate(II) by phenylhydrazine in aqueous medium

The silver(I)‐catalyzed exchange of coordinated cyanide in hexacyanoferrate(II) by phenylhydrazine in aqueous medium

Kinetic determination of trace amounts of thiosulfate based on its inhibitory effect

Solid phase extraction and spectrophotometric determination of mercury in tobacco and tobacco additives with 5-(p-aminobenzylidene)-thiothiorhodanine

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