Determination of mixed metal ions by complexometric titration and nonlinear partial least squares calibration

Ni, Yongnian; Peng, Zhaohong

doi:10.1016/0003-2670(94)00583-8

Cited by 9 publications

(6 citation statements)

References 16 publications

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“…This method has also been adopted by Ni and Peng. 11 In the computation process, a larger value for the coefficient c 2 was obtained for the four-component case than for the threecomponent cases. As can be seen from the prediction results in Table 4, in the two three-component cases, the response patterns of the three components were different, as shown in Figs.…”

Section: Sample Analysismentioning

confidence: 93%

Crown Ether-coated Piezoelectric Crystal Sensor Array for Detection of Organic Vapor Mixtures Using Several Chemometric Methods

Xing¹,

He²

1997

Analyst

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Section: Sample Analysismentioning

confidence: 93%

Crown Ether-coated Piezoelectric Crystal Sensor Array for Detection of Organic Vapor Mixtures Using Several Chemometric Methods

Xing¹,

He²

1997

Analyst

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“…There are several works in the literature with multidetermination application of titrations using one ISE (usually with a pH-ISE) (Ni 1995;Moisio 1996;Shamsipur 2002). To compare with this situation, a response model was built employing the readings of the ISE Calcium I, which was one of the sensors with response to both ions, as observed on Fig.…”

Section: Validation Of the Proposed Methodologymentioning

confidence: 99%

“…These procedures require a previous training process with standards that generates the necessary information for acquiring the predictive ability. The exploited detection systems have been usually the pH-ISE, used in combination with different mathematical models to solve complex acid-base mixtures after NaOH titration (Moisio 1996;Ni 1998;Shamsipur 2002) or metal mixtures after complexometric titrations (Ni 1995); sulphate, or calcium, were separately determined employing an hydrolytic potentiometric titration in conjunction with an ANN model (Brodnjak-Vonina 1999). Also, the acid-base flow injection titration of mixtures of acids in juice samples is described in the literature, for which an ANN model was developed (Zampronio 2004).…”

Section: Introductionmentioning

confidence: 99%

Multicomponent Titration of Calcium + Magnesium Mixtures Employing a Potentiometric Electronic‐Tongue

2007

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A fast novel potentiometric titration procedure is proposed, in which the detection system is formed by a potentiometric electronic tongue. The titration consists in a reduced number of fixed titrant additions to the sample and the recording of the potentials of an array of Ion Selective Electrodes. The obtained data matrix is entered to an Artificial Neural Network response model, previously trained to furnish concentrations of a multicomponent mixture. The principle is demonstrated with automated EDTA titration of mixtures of Ca 2þ and Mg 2þ at fixed pH 8.5. In this case, five 2 ml fixed volume additions plus the readings of four sensors were adequate for the resolution of the mixture. In the conditions used, titration was feasible up to 3.3 mM total ion concentration, the precision was estimated as 3.20% RSD for Ca 2þ and 2.76% RSD for Mg 2þ (n ¼ 5), and the detection limits 0.16 mM Ca 2þ and 0.26 mM Mg 2þ . The procedure was applied to mineral waters and compared with reference methods (correlation ¼ 0.92 for Ca 2þ and correlation ¼ 0.89 for Mg 2þ , n ¼ 14).

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“…4,[25][26][27][28] EDTA has been used to analyze almost half of the elements in the periodic table while its derivatives such as diethylene triamine pentaacetic acid (DTPA) and ethylene glycol tetraacetic acid (EGTA) provide similar usage. 4,[29][30][31][32][33][34][35][36][37] EDTA and its derivatives belong to the aminopolycarboxylic acid family. It is able to dissociate into several protonation states.…”

Section: The Classical Chelator Edtamentioning

confidence: 99%

Complexometric titrations: new reagents and concepts to overcome old limitations

Zhai

Bakker

2016

Analyst

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Chelators and end point indicators are the most important parts of complexometric titrations. The most widely used universal chelator ethylenediamine tetraacetic acid (EDTA) and its derivatives can strongly coordinate with different metal ions. Their limited selectivity often requires the use of masking agents, and the multiple pKa values of the chelators necessitate a careful adjustment of pH during the procedure. Real world requirements for pH independent, selective and sensitive chelators and indicators call for a new design of these reagents. New concepts and structures of chelators and indicators have indeed recently emerged. We present here recent developments on chelators and indicators for complexometric titrations. Many of these advances were made possible only recently by moving the titration from a homogeneous to a heterogeneous phase using a new class of chelators and indicators based on highly selective ionophores embedded in ion-selective nanosphere emulsions. In view of achieving titrations in situ by complete instrumental control, thin layer electrochemistry has recently been shown to be an attractive concept that replaces the traditional cumbersome titration protocol with a direct reagent free sensing tool.

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Determination of mixed metal ions by complexometric titration and nonlinear partial least squares calibration

Cited by 9 publications

References 16 publications

Crown Ether-coated Piezoelectric Crystal Sensor Array for Detection of Organic Vapor Mixtures Using Several Chemometric Methods

Crown Ether-coated Piezoelectric Crystal Sensor Array for Detection of Organic Vapor Mixtures Using Several Chemometric Methods

Multicomponent Titration of Calcium + Magnesium Mixtures Employing a Potentiometric Electronic‐Tongue

Complexometric titrations: new reagents and concepts to overcome old limitations

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