Direct determination of cadmium in geological samples by slurry sampling electrothermal atomic absorption spectrometry

Cui, Hao; Guo, Wei; Cheng, Mengting; Zhang, Ping; Liu, Jin; Guo, Qinghai; Hu, Shenghong

doi:10.1039/c5ay01719j

Cited by 11 publications

(3 citation statements)

References 55 publications

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“…2,3 However, the abundance of Cd in the Earth’s crust is as low as 0.09 μg g −1 . 4 Thus, a higher sensitivity and anti-interference analytical method is needed.…”

Section: Introductionmentioning

confidence: 99%

Accurate Determination of Trace Cadmium in Soil Samples with Graphite Furnace Atomic Absorption Spectrometry Using Metal–Organic Frameworks as Matrix Modifiers

et al. 2022

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Cadmium (Cd) is a highly toxic heavy metal that is widely distributed in soils at low concentrations. Its volatilization loss occurs at an ashing temperature higher than 350 °C. Accordingly, the accurate determination of its concentration in soils often requires the addition of chemical modifiers by graphite furnace atomic absorption spectrometry (GFAAS) to improve the thermal stability of Cd. In this work, a metal–organic framework (MOF, UIO-66-NH2) was utilized as a matrix modifier to improve accuracy in determining Cd in soils by GFAAS. The Cd signal, as influenced by drying and pyrolysis temperature and special gas, was also investigated, and the measuring conditions were optimized (2 μg L-1 Cd concentrations, matrix modifier: UIO-66-NH2, pyrolysis temperature: 550 °C, atomization temperature: 1650 °C, and special gas: air). The limit of detection (LOD) and the characteristic mass for Cd in soil were 3.84 ng g-1 and 0.80 pg, respectively. Five soil standard reference materials (SRMs) were analysed for Cd to verify the effectiveness of the optimized measuring conditions. The soil Cd concentrations obtained were in remarkable agreement with the reference values. Moreover, the mechanism of UIO-66-NH2 on the graphite platform was investigated in the drying and pyrolysis steps by SEM, FTIR, XRD, and XPS. During the drying steps, many functional groups of the matrix were activated, and Cd2+ could be captured on its surface. After the pyrolysis step, the structure matrix collapsed and was partially decomposed into ZrO2, and subsequently, an intermediate state of ZrO2-(CdO) appeared at high temperatures, which came from the active binding sites on the zirconium oxide octahedron nodes.

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“…2,3 However, the abundance of Cd in the Earth’s crust is as low as 0.09 μg g −1 . 4 Thus, a higher sensitivity and anti-interference analytical method is needed.…”

Section: Introductionmentioning

confidence: 99%

Accurate Determination of Trace Cadmium in Soil Samples with Graphite Furnace Atomic Absorption Spectrometry Using Metal–Organic Frameworks as Matrix Modifiers

et al. 2022

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“…9 Cui et al proposed a direct method for the determination of cadmium in geological samples by electrothermal atomic absorption spectrometry (ET AAS), aer sonication of the sample mass in the presence of 0.5% (v/v) nitric acid solution. 10 Silva et al developed a method for speciation analysis of inorganic antimony in river sediment samples using hydride generation atomic absorption spectrometry. The species extraction has been done using ultrasound assisted radiation and different solutions.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound assisted extraction for the determination of mercury in sediment samples employing cold vapour atomic absorption spectrometry

et al. 2016

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“…Determinations of cadmium in soils have been carried out using analytical techniques, such as atomic absorption spectrometry (AAS), [4][5][6][7][8] inductively coupled plasma atomic emission spectrometry (ICP-AES) 9,10 and inductively coupled plasma mass spectrometry (ICP-MS) 10,11 after the extraction of cadmium with acid solutions, such as hydrochloric acid, nitric acid and aqua regia. [4][5][6][9][10][11]13 Although these methods are highly sensitive, they need expensive instrumentations, and involve time-consuming procedures.…”

Section: Introductionmentioning

confidence: 99%

Selective Spectrophotometric Determination of Trace Amounts of Cadmium in Soil and Sediment Samples Using a Green Aqueous Biphasic Extraction

et al. 2016

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A green extraction spectrophotometric method was presented for the determination of trace amounts of cadmium in soil and sediment samples. This method is based on the selective extraction of cadmium as its iodide complex by aqueous biphasic extraction composed of polyethylene glycol (PEG) and sodium sulfate, and a subsequent sensitive determination by spectrophotometry using 2-(5-bromo-2-pyridylazo)-5-[N-n-propyl-N-(3-sulfopropyl)amino]phenol. This extraction method is simple and environmentally benign, since the organic solvents used for the traditional liquid-liquid extractions are replaced by the non-toxic polymer and inorganic salt. Cadmium can be selectively extracted from soil and sediment samples into the PEG-rich upper phase by an aqueous biphasic system containing potassium iodide and sulfuric acid. The proposed method was applied to the determination of cadmium in certified reference materials for soil and river sediment. The obtained results were in good agreement with the certified values.

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Direct determination of cadmium in geological samples by slurry sampling electrothermal atomic absorption spectrometry

Abstract: An accurate and high throughput method involving slurry sampling ETAAS was developed to detect trace Cd content in various geological samples.

Cited by 11 publications

References 55 publications

Accurate Determination of Trace Cadmium in Soil Samples with Graphite Furnace Atomic Absorption Spectrometry Using Metal–Organic Frameworks as Matrix Modifiers

Accurate Determination of Trace Cadmium in Soil Samples with Graphite Furnace Atomic Absorption Spectrometry Using Metal–Organic Frameworks as Matrix Modifiers

Ultrasound assisted extraction for the determination of mercury in sediment samples employing cold vapour atomic absorption spectrometry

Selective Spectrophotometric Determination of Trace Amounts of Cadmium in Soil and Sediment Samples Using a Green Aqueous Biphasic Extraction

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