Simultaneous determination of cobalt(II) and Ni(II) in water and soil samples with sequential injection analysis

Taljaard, R.E.; Staden, Jacobus Frederick van

doi:10.1016/s0003-2670(98)00099-3

Cited by 28 publications

(19 citation statements)

References 6 publications

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“…On the other hand, cobalt can be toxic when consumed in excessive quantities [2,3]. That is why its content in various samples is monitored, despite the fact that the existing methods for cobalt determination are not enough sensitive or cost effective [4][5][6][7]. 4-(2-Pyridylazo)resorcinol (PAR) has been proved to be one of the most important reagents for cobalt separation, preconcentration and determination .…”

Section: Introductionmentioning

confidence: 99%

Complex Formation in a Liquid-Liquid Extraction System Containing Cobalt(II), 4-(2-Pyridylazo)resorcinol, and Nitron

Racheva

Gavazov

Lekova

et al. 2013

Journal of Materials

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Complex formation and liquid-liquid extraction were studied in a system containing cobalt(II), 4-(2-pyridylazo)resorcinol (PAR), 1,4-diphenyl-3-(phenylamino)-1H-1,2,4-triazole (Nitron, Nt), water, and chloroform. The effect of some experimental parameters (pH, shaking time, concentration of PAR, and concentration of Nt) was systematically investigated, and the optimum conditions for cobalt extraction as an ion-association complex, (NtH + )[Co 3+ (PAR) 2 ], were found. The following key equilibrium constants were calculated: constant of association (Log = 4.77 ± 0.06), constant of distribution (Log D = 1.34 ± 0.01), and constant of extraction (Log ex = 6.11 ± 0.07). Beer's law was obeyed for Co concentrations up to 1.7 g mL −1 with a molar absorptivity of 6.0 × 10 4 L mol −1 cm −1 at max = 520 nm. Some additional characteristics, such as limit of detection, limit of quantification, and Sandell's sensitivity, were estimated as well.

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Section: Introductionmentioning

confidence: 99%

Complex Formation in a Liquid-Liquid Extraction System Containing Cobalt(II), 4-(2-Pyridylazo)resorcinol, and Nitron

Racheva

Gavazov

Lekova

et al. 2013

Journal of Materials

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“…One portion of the handled sample zone is stopped into the analytical path whereas the other flows directly towards detection; after a pre-selected time interval, the retained portion is also allowed to flow towards detection; two peaks corresponding to two mean sample residence times are then recorded. The innovation was originally implemented in a sequential injection system and the main rotary valve governed the slicing process, allowing the spectrophotometric determinations of cobalt and nickel in natural waters and soil extracts [36].…”

Section: Other Possibilitiesmentioning

confidence: 99%

Differential Reaction-Rate Methods in Flow Analysis

Sasaki¹

2012

TOACJ

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Abstract:Simultaneous determinations exploiting the rates of reactions of different analytes with a common reagent, often referred to as differential kinetic analysis, is efficiently implemented in the flow analyser. To this end, specific strategies for pumping, commuting and/or detecting have been proposed. This review critically discusses the potentialities, limitations and application ranges of the different flow systems designed to accomplish differential reactionrate methods, with emphasis to those involving spectrophotometric and luminometric detection.

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“…6 In the last fifteen years, several spectrophotometric method have been successfully employed in the individual and simultaneous determinations of nickel in mixtures. [7][8][9][10][11][12][13][14][15][16][17][18][19][20] Dioxolenes are derived from 1,2-di-oxo-benzene and can assume the quinone (L), radical-anion semiquinone (L 1-) and di-anion catecholate (L 2-), structures, Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Determination of Ni(II) in metal alloys by spectrophotometry UV-Vis using dopasemiquinone

Barreto

Scarmínio

et al. 2010

Quím. Nova

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Recebido em 12/2/09; aceito em 10/7/09; publicado na web em 13/11/09 A spectrophotometric method was proposed for Ni(II) determination in alloys using a dopa-semiquinone (L. The optimal conditions for the determination were: wavelength 590 nm, temperature 25 °C, reaction time 45 min and pH 7.5. The Beer's law was obeyed for nickel from 3.33 x 10 -5 to 1.78 x 10 -4 mol L -1. The method was applied to complex samples, such as inox, nickel-titanium and cobalt-chromium alloys. A study of the potential interferents revealed that Mn was the major interferent. The limit of detection and quantification were 2.88 x 10 -5 mol L -1 and 3.06 x 10 -5 mol L -1 , respectively.

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Simultaneous determination of cobalt(II) and Ni(II) in water and soil samples with sequential injection analysis

Cited by 28 publications

References 6 publications

Complex Formation in a Liquid-Liquid Extraction System Containing Cobalt(II), 4-(2-Pyridylazo)resorcinol, and Nitron

Complex Formation in a Liquid-Liquid Extraction System Containing Cobalt(II), 4-(2-Pyridylazo)resorcinol, and Nitron

Differential Reaction-Rate Methods in Flow Analysis

Determination of Ni(II) in metal alloys by spectrophotometry UV-Vis using dopasemiquinone

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