An improved microextraction method based on continuous sample drop flows and solidification of switchable hydrophilic fatty acid for the speciation of chromium in aqueous samples

Fouladlou, Somayeh; Faraji, Hakim; Shahbaazi, Hamidreza; Moghimi, Ali; Azizinezhad, Fariborz

doi:10.1080/03067319.2020.1727462

Cited by 8 publications

(2 citation statements)

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“…A microextraction procedure based on "continuous sample drop ows and solidication of switchable hydrophilic fatty acid" has been reported in which the Cr VI (as the 1,5-diphenylcarbazide complex) in the extraction phase, diluted to 1 mL with acetonitrile, was determined by ETAAS. 106 The LOD was 0.3 mg L À1 and the procedure was applied to the analysis of river, tap, and well water and industrial wastewater, in which both Cr VI and Cr III were detected (except in the tap water), though no procedure was given for the Cr III determination. Spike recoveries of concentrations from 3-30 mg L À1 ranged from 96 to 105%.…”

Section: Chromiummentioning

confidence: 99%

Atomic Spectrometry Update: review of advances in elemental speciation

Clough

Harrington

Hill

et al. 2021

J. Anal. At. Spectrom.

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Section: Chromiummentioning

confidence: 99%

Atomic Spectrometry Update: review of advances in elemental speciation

Clough

Harrington

Hill

et al. 2021

J. Anal. At. Spectrom.

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“…Due to its numerous industrial applications in wood preservation, leather tanning, electroplating, and steel alloy production, exposure to hexavalent Cr is unavoidable [14][15][16][17]. When discharged into the environment, the atmosphere and aquatic systems serve as means of long-range chromium transport and distribution [9,11].…”

Section: Introductionmentioning

confidence: 99%

Two-step one-pot speciation of chromium as Cr-APDC-and-NaEDTA complexes followed by ETA-AAS analysis

Salihu,

Bakar

2024

Recent Adv. Nat. Sci

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A two-step preconcentration method involving solid-and-liquid-phase extraction procedures has been proposed for the speciation of chromium in a one-pot system. The method used sodium ethylenediaminetetraacetic acid (NaEDTA) and ammonium pyrrolidinedithiocarbamate (APDC). The Cr(VI)-APDC was extracted with ethyl acetate and digested with nitric acid. while the Cr(III)-EDTA complex ion was adsorbed onto Al2O3 (neutral grade) with the aid of a tetrabutylammonium bromide (TBAB) pairing agent and desorbed with a hydrochloric acid solution. Sample splitting was not required. The ZEEnit 650P, electrothermal atomization atomic absorption spectrometer, (ETA-AAS) was employed for the analysis. The concentration of the chromium (III) in the samples ranged from 1.83±0.00 µg L−1 to 106.28±0.21 µg L−1, while <LOD to 19.85±0.12 µg L−1 was the range of Cr(VI) concentration in the samples. Recovery from spiked samples was between 83% and 117% Cr(III) and 79% and 99% Cr(VI). Precision (n = 6), was 1.87% for Cr(III) and 7.67% for Cr(VI). The limits of detection (LODs), calculated by the Aspect LS software (3σ, n = 11) were 0.42 µg L−1 and 0.62 µg L−1 for Cr(III) and Cr(VI) respectively. The mean total chromium (n = 3), from the certified reference material (CRM), LGC6019 was 0.74±0.61 µg L−1, (certified value = 0.78±0.20 µg L−1). The preconcentration factor: ratio of the Cr(III) content of CRM before and after preconcentration was 3.57. Parameters such as pH, time, temperature, and the amount of adsorbent were optimized by the isolation method. The method was validated and applied for the speciation analysis of chromium in water samples.

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