New intelligent photometric titration system and its method for constructing chemical oxygen demand based on micro-flow injection

Zhang, Huan; Zhu, Jianzhong; Chen, Qi; Jiang, Shengtao; Zhang, Yushan; Fu, Ting

doi:10.1016/j.microc.2018.08.009

Cited by 3 publications

(1 citation statement)

References 46 publications

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“…Techniques of flow analysis offer many possibilities of automation of analytical methods, including titration analysis. Using flow-based systems, titration has been performed based on the conventional procedure [1][2][3][4][5][6][7], and many novel approaches have also been developed for its implementation . They differ in terms of the way of introducing the sample into the flow system, merging it with the titrant solution to create an analyte concentration gradient, and, consequently, the way of determining the analyte concentration.…”

Section: Introductionmentioning

confidence: 99%

Novel Approach to Automated Flow Titration for the Determination of Fe(III)

et al. 2020

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A novel approach to automated flow titration with spectrophotometric detection for the determination of Fe(III) is presented. The approach is based on the possibility of strict and simultaneous control of the flow rates of sample and titrant streams over time. It consists of creating different but precisely defined concentration gradients of titrant and analyte in each successively formed monosegments, and is based on using the calculated titrant dilution factor. The procedure was verified by complexometric titration of Fe(III) in the form of a complex with sulfosalicylic acid, using EDTA as a titrant. Fe(III) and Fe(II) (after oxidation to Fe(III) with the use of H2O2) were determined with good precision (CV lower than 1.7%, n = 6) and accuracy ( | RE | lower than 3.3%). The approach was applied to determine Fe(III) and Fe(II) in artesian water samples. Results of determinations were consistent with values obtained using the ICP–OES reference method. Using the procedure, it was possible to perform titration in 6 min for a wide range of analyte concentrations, using 2.4 mL of both sample and titrant.

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Section: Introductionmentioning

confidence: 99%

Novel Approach to Automated Flow Titration for the Determination of Fe(III)

et al. 2020

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Thermodynamic and kinetics studies on adsorption of Indigo Carmine from aqueous solution by activated carbon

Harrache

Abbas

Aksil

et al. 2019

Microchemical Journal

177

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Determination of Chemical Oxygen Demand in Water Samples Using Gas-phase Molecular Absorption Spectrometry

et al. 2020

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Chemical oxygen demand (COD) is important for water quality assessment, representing the level of reductive organic pollution from eutrophication in aquatic systems. For surface water quality monitoring, permanganate is usually applied as oxidizing reagent, and the routine COD Mn determination is mostly achieved by titration method. However, this titration method is tedious and time consuming, and the results suffer from the environmental temperature fluctuation and operation technique. In this study, a novel COD Mn determination method was developed using gas-phase molecular absorption spectrometry equipped with online automated digestion device for the first time. The effect of digestion temperature, digestion time and sulfuric acid content was thoroughly studied. This method exhibited a good linearity (0.35 to 12 mg/L), low detection limit (0.12 mg/L), and good RSD from various water samples (0.71-2.37%). When used for COD Mn determination in routine water quality monitoring, this automated GPMAS can considerably improve analysis speed, efficiency, accuracy and stability compared to traditional titration method.

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New intelligent photometric titration system and its method for constructing chemical oxygen demand based on micro-flow injection

Cited by 3 publications

References 46 publications

Novel Approach to Automated Flow Titration for the Determination of Fe(III)

Novel Approach to Automated Flow Titration for the Determination of Fe(III)

Thermodynamic and kinetics studies on adsorption of Indigo Carmine from aqueous solution by activated carbon

Determination of Chemical Oxygen Demand in Water Samples Using Gas-phase Molecular Absorption Spectrometry

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