Kinetic Determination of Mercury(II) at Trace Level from Its Catalytic Effect on a Ligand Substitution Process

Prasad, Surendra

doi:10.1007/s10809-005-0142-6

Cited by 20 publications

(11 citation statements)

References 27 publications

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“…where Y LOD is the signal for the limit of detection, Y b is the average blank signal (n = 7) and S b is standard deviation of blank signal (n = 7) [21,24]. Some previous work on similar reaction systems has also demonstrated that the concentration of BrO 3 − should be adjusted for obtaining different calibration ranges [40,43,45].…”

Section: Analysis By Initial Rate Methodsmentioning

confidence: 99%

“…However, the catalytic kinetic spectrophotometric methods (CKM) offer distinct advantages for being of high sensitivity, low cost and simplicity for a large majority of analytes in water samples [21][22][23][24][25]. Few CKM for the determination of Se(IV) in water systems have been reported in the literature as presented in Table 1 [26][27][28][29][30][31][32][33] but no CKM exists which allows the determination of Se(IV), Se(VI) and total inorganic Se in water samples.…”

Section: Introductionmentioning

confidence: 99%

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Trace determination and chemical speciation of selenium in environmental water samples using catalytic kinetic spectrophotometric method

Chand

Prasad

2009

Journal of Hazardous Materials

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Section: Analysis By Initial Rate Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Trace determination and chemical speciation of selenium in environmental water samples using catalytic kinetic spectrophotometric method

Chand

Prasad

2009

Journal of Hazardous Materials

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“…The influence of various reaction variables along with other experimental findings, coupled with the earlier investigations on the Hg(II) catalyzed ligand substitution reaction of hexacyanoferrate(II) with pyrazine [34], N-methylpyrazinium iodide [36,42] and nitroso-R-salt [35] and Ag(I) catalyzed reaction of hexacyanoferrate(II) with nitrosobenzene [43], 2,2 0 -bipyridyl [44], nitroso-R-salt [45], 4-nitroso-N, N 0 -dimethylalanine [46] suggest that Ag(I) catalyzed substitution of CN -from [Fe(CN) 6 ] 4-in presence of phenylhydrazine also takes place through the mechanism given by us in an earlier investigation [37].…”

Section: Effect Of Temperature and Ionic Strengthmentioning

confidence: 90%

Kinetic determination of silver at trace level based on its catalytic effect on a ligand substitution reaction

Naik

Tiwari

Singh

et al. 2008

Transition Met Chem

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It is observed that Ag(I) catalyzes the rate of substitution of phenylhydrazine (PhNHNH 2 ) into hexacyanoferrate(II), producing a cherry red colored complex, [Fe(CN) 5 PhNHNH 2 ] 3-. The reaction was monitored at 488 nm leading to the formation of the complex under the conditions: [Fe(CN) 6 ] 4-(5.0 9 10 -3 mol dm -3 ), PhNHNH 2 (2.0 9 10 -3 mol dm -3 ), temperature (25 ± 0.1°C), pH (2.8 ± 0.02), and ionic strength, I (0.02 mol dm -3 ), (KNO 3 ). Under optimum conditions, absorbance at fixed times (A t ) is linearly related to Ag(I) in the concentration range 10.79-97.08 ng cm -3 , in the presence of several diverse ions. The highest percentage error and relative standard deviations in the entire range of Ag(I) determination are found to be 2.5% and 0.16, with a detection limit of 8.75 ng cm -3 of silver(I). The experimental accuracies expressed in terms of percentage recoveries are in the range of 97.87-102.50. The method was successfully applied for the determination of Ag(I) in a few synthetic samples and found to be in good agreement with those obtained from atomic absorption spectrophotometry (AAS). The validity of the proposed method has also been tested for Ag(I) determination in spiked drinking water samples. The present catalytic kinetic method (CKM) is highly sensitive, selective, reproducible, and inexpensive. A review of recently published catalytic spectrophotometric methods for determination of Ag(I) has also been presented for comparison.

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“…However, the catalytic kinetic spectrophotometric methods offer distinct advantages for being of high sensitivity, low cost, and simplicity for a large majority of analytes in water samples [28][29][30][31][32]. Some of these methods have high limit of detection, or suffer from many interfering ions such as Te(IV) and As(III), or have time-consuming procedures, or these reagents used are unstable.…”

Section: Introductionmentioning

confidence: 99%

A novel indicator system for catalytic spectrophotometric determination and speciation of inorganic selenium species (Se(IV), Se(VI)) at trace levels in natural lake and river water samples

et al. 2011

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A novel catalytic kinetic method is proposed for the determination of Se(IV), Se(VI), and total inorganic selenium in water based on the catalytic effect of Se(IV) on the reduction of Celestine blue by sodium sulfide at pH 7.0 phosphate buffer. The fixed-time method was adopted for the determination and speciation of inorganic selenium. Under the optimum conditions, the two calibration graphs are linear with a good correlation coefficient in the range 2-20 and 20-200 μg⋅L −1 of Se(IV) for the fixed-time method at 30°C. The experimental and theoretical detection limits of the developed kinetic method were found to be 0.21 and 2.50 μg⋅L −1 for the fixed-time method (3 min). All of the variables that affect the sensitivity at 645 nm were investigated, and the optimum conditions were established. The interference effect of various cations and anions on the Se(IV) determination was also studied. The selectivity of the selenium determination was greatly improved with the use of the strongly cation exchange resin such as Amberlite IR120 plus as long as chelating agents of thiourea and thiosulphate. The proposed kinetic method was validated statistically and through recovery studies in natural water samples. The relative standard deviations (RSDs) for ten replicate measurements of 2, 10, and 20 μg⋅L −1 of Se(IV) change between 0.35% and 5.58%, while the RSDs for ten replicate measurements of 3, 6, and 12 μg⋅L −1 of Se(VI) change between 0.49% and 1.61%. Analyses of a certified standard reference material (NIST SRM 1643e) for selenium using the fixed-time method showed that the proposed kinetic method has good accuracy. The Se(IV), Se(VI), and total inorganic selenium in lake and river water samples have been successfully determined by this method after selective reduction of Se(VI) to Se(IV).

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Kinetic Determination of Mercury(II) at Trace Level from Its Catalytic Effect on a Ligand Substitution Process

Cited by 20 publications

References 27 publications

Trace determination and chemical speciation of selenium in environmental water samples using catalytic kinetic spectrophotometric method

Trace determination and chemical speciation of selenium in environmental water samples using catalytic kinetic spectrophotometric method

Kinetic determination of silver at trace level based on its catalytic effect on a ligand substitution reaction

A novel indicator system for catalytic spectrophotometric determination and speciation of inorganic selenium species (Se(IV), Se(VI)) at trace levels in natural lake and river water samples

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