Spectrophotometric determination of traces of cobalt with 2-nitroso-5-(N-propyl-N-sulfopropylamino)phenol.

烈, 吉田; 景平, 上野

doi:10.2116/bunsekikagaku.34.2_77

Cited by 6 publications

(5 citation statements)

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“…The top curve in Fig In our previous paper, slightly higher values of the protonation constants were obtained on NPSAP by spectrophotometric method at 20° C and µ=0.1 with sodium perchlorate. 3 Accordingly, more detailed experiments were performed to elucidate this disagreement.…”

Section: Resultsmentioning

confidence: 99%

Potentiometrie Studies on the Binding Properties of Protons, Some Divalent and Tervalent Metal Ions with 2-Nitroso-5-(N-propyl-3-sulfopropylamino)phenol

1988

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The first and second protonation constants of 2-nitroso-5-(N-propyl-3-sulfopropylamino)phenol (NPSAP, H2l) and the stability constants of the metal ion complexes formed by NPSAP with some divalent and tervalent metal ions such as magnesium(II ), calcium(l l ), cobalt(il ), nickel(I I ), copper(I (), zinc(l l ), aluminium(II I ), iron(l I I) and gallium-(Ill) have been determined potentiometrically in aqueous solution at 25°C (µ=0.1 with KNO3).Keywords Stability constant, metal ion complexes, o-nitrosophenol, potentiometric titration o-Nitrosophenols are useful as selective chromogenic reagents for cobalt(II) ion.' However, little is known about their stability constants with metal ions due to the poor solubility of these reagents in water. Recently, 2-nitroso-5-(N-propyl-3-sulfopropylamino)-phenol (NPSAP, H2L) has been synthesized as a water soluble derivative of o-nitrosophenol, and was reported to be a highly sensitive chromogenic reagent for iron(II)2 and cobalt(II)3 in aqueous samples. This paper reports the results of a potentiometric study on the protonation constants of NPSAP and the stability constants of its complexes with some metal ions such as magnesium(II), calcium(II), cobalt(II), nickel(II), copper(II), zinc(II), iron(III), aluminium(III) and gallium(III) in comparison with other o-nitrosophenols and o-nitrosonaphthols. ExperimentalReagents NPSAP was kindly donated by Dojindo Laboratories. It was used without further purification by dissolving it in water to make 0.02 M (1 M=l mol dm-3) stock solution.The concentration of stock solution was standardized by titrating with a standard KOH solution. The solution was kept in a refrigerator and used within 5 days after being produced.The stock solutions of metal ions were prepared from the corresponding metal nitrates (analytical grade), and were standardized by EDTA titration.4The decarbonated standard potassium hydroxide solution was prepared according to the conventional procedure, by treating 0.25 M potassium hydroxide solution with barium hydroxide to precipitate barium carbonate, followed by the treatment of supernatant solution with a cation exchange column to remove excess barium (II) ion. The final concentration of potassium hydroxide solution was nearly 0.1 M; the solution was standardized against potassium hydrogen phthalate. TitrationThe solutions of 1:2 and 1:3 metal to ligand ratio, were titrated with 0

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Section: Resultsmentioning

confidence: 99%

Potentiometrie Studies on the Binding Properties of Protons, Some Divalent and Tervalent Metal Ions with 2-Nitroso-5-(N-propyl-3-sulfopropylamino)phenol

1988

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“…19 It has also been reported that the first and second acid dissociation constants of free PSAP are 2.74 and 8.45, respectively, 20 and it could be thought that the complexes have negative charges under the neutral condition. Actually, these complexes were concentrated in an anion exchanger phase.…”

Section: Characteristics Of Psap Complexesmentioning

confidence: 96%

Selective Determination of Trace Iron in Different Oxidation States in Natural Water by Flow Injection-Solid Phase Spectrometry

et al. 2012

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“…Therefore it is necessary to change chemical compositions in a large-scale recipe to adapt them to micro-operations. We have modified conventional-scale procedures for Fe(ii) and Co(ii) analyses [66,67] to allow them to be carried out in microchannels.…”

Section: Cfcp In Three-dimensional Channel Networkmentioning

confidence: 99%

“…In the conventional scale Co(ii) analysis done by Yoshida and Ueno [67], sequential reactions took place in a stoppered measuring flask. First, a sample solution containing Co(ii), 5 mL of 0.01-m Cetylpyridinium Bromide monohydrate (CPB) in 20% methanol/water, and 5 mL of 1 Â 10…”

Section: Cfcp In Three-dimensional Channel Networkmentioning

confidence: 99%

Continuous‐Flow Chemical Processing in Three‐Dimensional Microchannel Network for On‐Chip Integration of Multiple Reactions in a Combinatorial Mode

Ueno¹,

Hisamoto²,

Tokeshi³

et al. 2005

QSAR Comb. Sci.

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Chemical syntheses using microchemical chips have been intensively investigated in recent years, but they have still not fully reached the stage of practical use. Combinatorial synthesis has been expected to be one of their useful applications. Benefits of using microchips, such as reduction in quantity of reagents and wastes, are thought to be suited for combinatorial syntheses, where numerous variations of products have to be synthesized each in small amounts. There are two modes of combinatorial syntheses using microchemical chips. One is sequential synthesis, in which reactant solutions are introduced sequentially in various combinations to a reaction microchannel. The other is parallel synthesis, where the number of reaction channels is the same as the number of final products, and starting materials are distributed to all the reaction channels in different combinations. Sequential synthesis has been considered as the more favorable way, because, especially when libraries of starting materials are large, numerous microchannels and complicated pipings for distribution of reagents to the channels are required for the parallel mode. Therefore, research on parallel microcombinatorial syntheses has been done only rarely, whereas there have been many reports of sequential microcombinatorial syntheses. Against this trend, our research group has taken an alternative path and tried to integrate both parallel reaction microchannels onto a glass microchip and channels for distributing reactant solutions to each reaction channel in a combinatorial mode. Microchips fabricated by laminating multiple layers of glass substrates have been used to construct three-dimensional microchannel networks necessary for mixing reagent flows in different combinations. We utilized low Reynolds number multi-phase laminar flow and developed micro-unit operations (MUOs). By combining MUOs in the multi-phase continuous laminar flows, microchemical systems were constructed. We called this micro-integration methodology "continuous-flow chemical processing (CFCP)", and by using it, a sequence of various operations in chemical syntheses could be integrated on a microchemical chip. Not just simple mixing of two reagents, which was most commonly done in microreactors, but also multi-step processes including other chemical operations, such as extraction and separation, could be carried out via CFCP. In the first part of this short review article, we explain CFCP with an example. Then, a microchemical chip with a three-dimensional microchannel network for a parallel reaction system is introduced. Finally, we present a case in which CFCP was realized in a three-dimensional microchannel network. 742

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Spectrophotometric determination of traces of cobalt with 2-nitroso-5-(N-propyl-N-sulfopropylamino)phenol.

Cited by 6 publications

References 0 publications

Potentiometrie Studies on the Binding Properties of Protons, Some Divalent and Tervalent Metal Ions with 2-Nitroso-5-(N-propyl-3-sulfopropylamino)phenol

Potentiometrie Studies on the Binding Properties of Protons, Some Divalent and Tervalent Metal Ions with 2-Nitroso-5-(N-propyl-3-sulfopropylamino)phenol

Selective Determination of Trace Iron in Different Oxidation States in Natural Water by Flow Injection-Solid Phase Spectrometry

Continuous‐Flow Chemical Processing in Three‐Dimensional Microchannel Network for On‐Chip Integration of Multiple Reactions in a Combinatorial Mode

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