Utilization of activating and masking effects by ligands for highly selective catalytic spectrophotometric determination of copper and iron in natural waters

Ohno, Shinsuke; Teshima, Norio; Zhang, Heng; Sakai, Tadao

doi:10.1016/s0039-9140(03)00222-4

Cited by 26 publications

(20 citation statements)

References 20 publications

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“…3 (b). Although neocuproine acted as an activator for the coppercatalyzed reaction, 18 the same result could not be observed in this study. Neocuproine acted as an activator for a coppercatalyzed reaction when the DMA concentration was 0.02 -0.03 M and the p-anisidine concentration was 0.01 M. On the other hand, neocuproine acted as an inhibitor for copper(II) if the concentration of p-anisidine was more than 0.02 M. Thus, the activator for copper(II) determination was not used in the present FIA study.…”

Section: Effects Of Activators On the Catalytic Reactionscontrasting

confidence: 52%

“…In a previous study, 18 diphosphate was effective as a masking agent to determine copper(II) and iron(III) successively. The effects of diphosphate for copper(II) and iron(III) were investigated using the FIA system.…”

Section: Effect Of Diphosphate On the Determination Of Copper(ii) Andmentioning

confidence: 99%

“…17 Since the absorbance of the dye formed at a fixed time was proportional to these metal concentrations, it was possible to determine copper(II) and iron(III). In a previous paper, 18 this kinetic-catalytic analysis was performed to determine copper(II) and iron(III) selectively by a batchwise method. This paper describes a catalytic method using an FIA system equipped with a serial flow cell for the successive determination of copper(II) and iron(III) at sub-ppb levels in natural water samples, because the sensitivity and selectivity can be improved.…”

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confidence: 99%

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Successive Determination of Copper and Iron by a Flow Injection-Catalytic Photometric Method Using a Serial Flow Cell

et al. 2004

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Trace amounts of copper and iron exist widely in river, tap, pond, well, and underground water. These metals are essential trace elements for biological systems. Numerous dissolving chemical forms, such as aqua ions, complexes and colloids, are observed in natural water. In general, the toxicity of dissolved copper(II) is considered to be much less than that of mercury, but greater than that of cadmium, silver, lead, and zinc. 1 However, it has been reported that chelating agents, such as nitrilotriacetic acid and ethylenediaminetetraacetic acid, decreased the toxicity of copper.2 The concentration levels of these metals existing in natural water are trace and/or ultratrace. Therefore, a highly sensitive analytical method for the determination of copper and iron is required to investigate water pollution.Kinetic-catalytic methods based on catalyzed reactions have been developed for the determination of manganese, chromium, cobalt, and vanadium ions at trace and ultratrace levels. [3][4][5][6] Kawashima et al. have determined ppb levels of iron in tap and hot-spring water samples. 7 Recently, the present authors also reported a catalytic method for the determination of copper using a flow-injection system. 8 On the other hand, adsorptive cathodic stripping voltammetry (ACSV) was proposed to measure copper in seawater at trace levels. 9 However, one of the major problems in ACSV is the adsorption of organic compounds on the electrode. 10 The kinetic-catalytic methods require a controlled reaction temperature, time, and constant mixing of the reagents. Thus, flow injection analysis (FIA), which has advantages of rapidity and easy assembly, is efficient to control serious experimental conditions. However, it is difficult to successively determine several analytes by an FIA system equipped with a conventional flow cell. Recently, Sakai and his co-workers designed twochannel double and serial flow cells 11 and a twin flow cell 12 for the simultaneous determination of copper and iron with 2-(5-However, these methods using chromogenic reagents were not sufficient for the determination of sub-ppb levels of copper and iron. Also, it is difficult to analyze the complexation reactions of ppb levels of copper and iron with ligands, such as humic and fulvic acids. During the recent decade, some researchers have reported on catalytic methods for binary metal mixtures, such as silver(I)-mercury(II), 13 chromium(VI)-tungsten(VI), 14 and iron(II)-antimonony(III). 15 However, there are few reports on kineticcatalytic methods for the determination of two catalysts using a single indicator reaction.In the presence of hydrogen peroxide, p-anisidine reacted with N,N-dimethylaniline (DMA) to form a dye (λmax = 740 nm). Although the oxidative coupling reaction was slow, the reaction rate was accelerated in the presence of copper(II) 16 or iron(III). 17Since the absorbance of the dye formed at a fixed time was proportional to these metal concentrations, it was possible to determine copper(II) and iron(III). In a previous paper, 18 this k...

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Section: Effects Of Activators On the Catalytic Reactionscontrasting

confidence: 52%

Section: Effect Of Diphosphate On the Determination Of Copper(ii) Andmentioning

confidence: 99%

mentioning

confidence: 99%

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Successive Determination of Copper and Iron by a Flow Injection-Catalytic Photometric Method Using a Serial Flow Cell

et al. 2004

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“…We reported a FI spectrophotometric method for copper determination based on this catalytic reaction. 70 A Cu(II) concentration as low as 0.05 -1 mg L -1 can Although the determination of a single metal catalyst based on catalytic reactions has become popular, several workers have also reported catalytic methods for binary or ternary metal mixtures such as Mo(VI)/W(VI), 71 Fe(III)/Ag(I)/Mn(II), 72 and Cu(II)/Fe(III) [73][74][75] in the last decade. The oxidative coupling of p-anisidine and N,N-dimethylaniline in the presence of hydrogen peroxide to form a dye (lmax = 740 nm) is catalyzed by Cu(II) and Fe(III).…”

Section: Highly Sensitive Fia Using Novel Catalytic Reactionmentioning

confidence: 99%

Advancement of Flow-based Analysis with Alternative Chemical Reactions and New Devices for Environmental and Biological Samples

Sakai

Teshima

2008

ANAL. SCI.

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This review includes our researches and other methodologies related to flow-based techniques, such as flow injection analysis (FIA) and sequential injection analysis (SIA). The methods will demonstrate semi-and full automated FIA and SIA, including liquid-liquid and liquid-solid extraction. FIA using alternative chemical reactions in the aqueous solution was applied to the trace analysis of metals in biological and environmental samples. For durable liquid-liquid extraction, several phase separators were designed. Moreover, multi-channel FIA with newly designed flow cells and SIA with labon-valve devices have been used for the simultaneous and successive determination of metals and organic compounds. On-line solid phase extraction (SPE) has also been proposed for highly sensitive analysis of organic and inorganic compounds.

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“…17,18 Various kinetic methods based on the catalytic action of iron on the oxidation of organic compounds have been reported in several reviews [19][20][21] and original papers. 13,[22][23][24][25] Among the many sensitive techniques for iron determination, kinetic catalytic methods are worth special mention on account of their high sensitivity and simple and low-cost equipment. 26 Developing of novel simple kinetic procedures, carried out at an easily maintained temperature for a short reaction time, is still needed from the practical point of view.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Determination of Trace Iron by Using Its Catalytic Effect on the N-Phenylanthranilic Acid-Potassium Periodate Reaction

Stoyanova

2008

ANAL. SCI.

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The analytical features of the reaction between N-phenylanthranilic acid (PAA) and potassium periodate in acidic medium are explored with the aim of improving the catalytic kinetic determination of iron in water samples. In the presence of Fe(II, III), PAA is oxidized by potassium periodate in a formic acid medium to form a violet-colored compound. The reaction is followed spectrophotometrically by measuring the increase in the absorbance of the oxidation product at 525 nm. The variables that affected the reaction rate were investigated and the reaction conditions were established. Calibration graphs are linear in the range of concentrations 2 -500 ng mL -1 . As low as 10 -8 mol L -1 Fe(II, III) can be easily determined by the fixed time method. The established catalytic method was successfully applied to the determination of iron in tap water and in pharmaceutical samples.

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Utilization of activating and masking effects by ligands for highly selective catalytic spectrophotometric determination of copper and iron in natural waters

Cited by 26 publications

References 20 publications

Successive Determination of Copper and Iron by a Flow Injection-Catalytic Photometric Method Using a Serial Flow Cell

Successive Determination of Copper and Iron by a Flow Injection-Catalytic Photometric Method Using a Serial Flow Cell

Advancement of Flow-based Analysis with Alternative Chemical Reactions and New Devices for Environmental and Biological Samples

Spectrophotometric Determination of Trace Iron by Using Its Catalytic Effect on the N-Phenylanthranilic Acid-Potassium Periodate Reaction

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