Analysis of nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) in water, particularly waste water

Randt, C.; Wittlinger, R; Merz, W.

doi:10.1007/bf00321281

Cited by 40 publications

(16 citation statements)

References 2 publications

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“…At the same time, the EOF can be suppressed by addition of HEC to the running buffer. So, in this region, m eof < 0, thus, m app < m ele (2) and…”

Section: Theorymentioning

confidence: 99%

“…Since its commercialization in the early 1950s, the synthetic ethylenediaminetetraacetic acid (EDTA) has been widely used as chelating reagent for metal ions in detergent, pharmaceutical, and agricultural applications [1,2]. EDTA possesses a strong capability to form stable complexes with 62 different metal cations as well as low biodegradability [3].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, EDTA can be measured by GC in concentrations down to 1 mg/L. Despite the low detection limit, this method has some drawbacks such as a relatively large influence of the matrix on the accuracy and a tedious derivatization step of the carboxylic group by esterification [2]. Alternatively, EDTA may also be determined as its negatively charged complexes by IC-UV spectrophotometric detection with the detection limit of 100 mg/L [9].…”

Section: Introductionmentioning

confidence: 99%

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Large-volume sample stacking for analysis of ethylenediaminetetraacetic acid by capillary electrophoresis

et al. 2002

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A simple, quick, and sensitive capillary electrophoretic technique-large volume stacking using the electroosmotic flow (EOF) pump (LVSEP) - has been developed for determining ethylenediaminetetraacetic acid (EDTA) in drinking water for the first time. It is based on a precapillary complexation of EDTA with Fe(III) ions, followed by large-volume sample stacking and direct UV detection at 258 nm. The curve of peak response versus concentration was linear from 5.0 to 600.0 microg/L, and 0.7 to 30.0 mg/L. The regression coefficients were 0.9988 and 0.9990, respectively. The detection limit of the current technique for EDTA analysis was 0.2 microg/L with an additional 10-fold preconcentration procedure, based on the signal-to-noise ratio of 3. As opposed to the classical capillary zone electrophoresis (CE) method, the detection limit was improved about 1000-fold by using this LVSEP method. To the best of our knowledge, it represents the highest sensitivity for EDTA analysis via CE. Several drinking water samples were tested by this novel method with satisfactory results.

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“…At the same time, the EOF can be suppressed by addition of HEC to the running buffer. So, in this region, m eof < 0, thus, m app < m ele (2) and…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Large-volume sample stacking for analysis of ethylenediaminetetraacetic acid by capillary electrophoresis

et al. 2002

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“…Moreover, the solvent-solvent interactions produced in solvent mixtures can affect the solute-solvent interactions and therefore they can also affect preferential solvations. 16 In present work we have chosen a well understood system, 17 complexation of molybdenum(VI) with nitrilotriacetic acid, nta, 18 in different solutions of propanol＋water to show how the solvents and their mixtures with various dielectric constants affect the formation of such a complex.…”

Section: Introductionmentioning

confidence: 99%

Solvent Effects on Complexation of Molybdenum(VI) with Nitrilotriacetic Acid in Different Aqueous Solutions of Propanol

Mohammadi

2007

Chin. J. Chem.

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By using spectrophotometric and potentiometric techniques the formation constants of the species formed in the systems H ＋＋Mo(VI)＋nitrilotriacetic acid and H ＋＋nitrilotriacetic acid have been determined in aqueous solutions of propanol at 25 ℃ and constant ionic strength 0.1 mol•dm -3 sodium perchlorate. The composition of the complex was determined by the continuous variation method. It was shown that molybdenum(VI) forms a mononuclear 1∶1 complex with nitrilotriacetic acid of the type MoO 3 L -3 at -lg[H ＋ ]＝5.8. The formation constants in various media were analyzed in terms of Kamlet and Taft's parameters. Linear relationships were observed when lg K S was plotted versus p*. Finally, the results were discussed in terms of the effect of solvent on complexation.

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“…Therefore, separation techniques operating in the liquid phase such as high-performance liquid chromatography (HPLC) should be more versatile. Various HPLC methods have been reported in the literature for the separation of aminopolycarboxylic acids and their metal complexes [3][4][5][6][7][8][9][10][11][12]. In most of these papers, the analysis had been carried out after the addition of an excess of a metal ion to the sample so that a differentiation between free and metal-complexed aminopolycarboxylic acids had not been achieved.…”

mentioning

confidence: 99%

Determination of chelating agents and metal chelates by capillary zone electrophoresis

Buchberger

Mülleder

1995

Mikrochim Acta

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Abstract. Aminopolycarboxylic acids such as diethylenetriaminepentaacetic acid (DTPA) are commonly used as chelating agents in many pulp and paper industries, particularly as scavengers of metal ions which catalyze the decomposition of hydrogen peroxide used as a bleaching agent. Concern for the effect of waste DTPA in the aquatic environment has led to a need for the development of methods to determine its levels in waste water. This paper describes the determination of free DTPA and several metal-DTPA complexes in water and waste water by capillary zone electrophoresis. The optimization of separation conditions included the selection of an appropriate carrier electrolyte composition (pH, organic solvents, ion-pairing reagents) and the systematic investigations of selective complexation of free DTPA as well as metal exchange reactions for metal-DTPA complexes in order to achieve selective and sensitive direct UV detection. The determination of DTPA in waste water from a paper mill was possible in the low ppm range.Key words" aminopolycarboxylic acids, metal chelates, capillary zone electrophoresis, waste water.Chelating agents such as aminopolycarboxylic acids are widely used as metalmasking additives in various industrial branches, for instance in the pharmaceutical industry, the food industry and in the paper industry. Pulp and paper industries using hydrogen peroxide bleaching of the pulp require chelating agents to remove metal ions which would lead to a decomposition of the bleach chemical and cause excessive usage of hydrogen peroxide. Diethylenetriaminepentaacetic acid (DTPA) is the preferred chelating agent in the paper industry. Like other aminopolycarboxylic acids, its release to the environment may affect the distribution of metals within aquatic ecosystems and may remobilize heavy metals from sediments. Therefore, the concern for the effect of waste DTPA has led to a need for the development of methods to determine the levels of free DTPA and its complexes with iron, copper, zinc and manganese in waste water.Mixtures of various aminopolycarboxylic acids are best determined by gas chromatography after derivatization of the carboxylic group by esterification [-1-3].

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Analysis of nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) in water, particularly waste water

Cited by 40 publications

References 2 publications

Large-volume sample stacking for analysis of ethylenediaminetetraacetic acid by capillary electrophoresis

Large-volume sample stacking for analysis of ethylenediaminetetraacetic acid by capillary electrophoresis

Solvent Effects on Complexation of Molybdenum(VI) with Nitrilotriacetic Acid in Different Aqueous Solutions of Propanol

Determination of chelating agents and metal chelates by capillary zone electrophoresis

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