Indirect complexometric determination of small amounts of tellurium

Nonova, D.; Tuzsuzova, A.

doi:10.1007/bf01215729

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…Therefore, it is of great importance and significance for environment science and life science to separate and determinate trace Zinc in environmental water samples. Various different methods, such as high-speed countercurrent chromatography, 1 adsorptive stripping voltammetry, 2,3 high resolution ICP-MS, 4 flame atomic absorption spectrometry, 5,6 square-wave anodic stripping voltammetry, 7 solid phase spectrophotometry, 8 potentiometric stripping, 9 derivative atomic absorption spectrometry, 10 flow injection isotope dilution inductively coupled plasma mass spectrometry, 11 ICP-AES, 12 RP-HPLC, 13 spectrofluorimetry, 14,15 anodic stripping voltammetry, 16,17 extractionspectrophotometry, 18 have been applied for the determination of trace zinc in environmental samples, it was impossible for Zn(II) to be directly determined due to the low con-centration of Zn(II) in environmental samples. In order to achieve accurate results, separation and enrichment step is necessary when the concentration of Zn(II) is too low to be directly determined.…”

Section: Introductionmentioning

confidence: 99%

Study on the Determination of Trace Zinc by Spectrophotometry after Flotation Separation with Ternary Association Complex System

2010

J Chinese Chemical Soc

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The paper presents a novel method for the flotation separation of Zn2+ with ternary association complex system prior to the determination by spectrophotometry. The effects of different parameters, such as the dosages of NH4SCN and dodecyl trimethyl ammonium chloride (DTAC), various salts and acidity etc. on the flotation yield of Zn2+ have been investigated to select the experimental conditions. The possible flotation mechanism of Zn2+ was discussed. The results showed that by controlling pH 4.0, in the presence of 1.0 g NaBr, when the dosage of 0.1 molṁL−1 NH4SCN solution was 2.50 mL and 5.0 × 10−3 molṁL−1 DTAC solution was 2.00 mL respectively, the water‐insoluble ternary association complex of [Zn(SCN)4] (DTAC)2 which produced by Zn2+ and SCN−, DTAC cation (DTAC+) floated above water phase and liquid‐solid phases were formed with clear interface, while K+, Na+, Ca2+, Mg2+, Al3+, Fe2+, Mn2+, Cd2+, Co2+ and Ni2+ could not be floated, so Zn2+ was floated quantitatively at pH 4.0. Thereby, the quantitative separation of Zn2+ from the above metal ions could be achieved. A new method of determination of trace zinc by flotation separation was established. The proposed method has been successfully applied to the determination of Zn2+ in plating waster water, and the results agreed well with AAS method. The recoveries were 93.6%∼106.4%, and the RSD was 1.8%∼2.3%.

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Section: Introductionmentioning

confidence: 99%

Study on the Determination of Trace Zinc by Spectrophotometry after Flotation Separation with Ternary Association Complex System

2010

J Chinese Chemical Soc

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“…Also, tellurium in its alloys was analyzed by back-titration of the excess K 2 Cr 2 O 7 against Fe(II) using N-phenylanthranilic acid (6). Indirect compleximeteric titration was used to determine Te(IV) with diethyldithiocarbamic acid as reagent (7). Photometric titration of Te(IV) against K 2 Cr 2 O 7 at 380-430 nm was explained (8).…”

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confidence: 99%