Novel nickel trap coupled with electrothermal vaporization for the direct solid-sampling analysis of cadmium in soil

Liu, Tengpeng; Liu, Jixin; Mao, Xuefei; Xing, Na; Shao, Yunbin; Qian, Yongzhong

doi:10.1039/d2ja00106c

Cited by 11 publications

(9 citation statements)

References 42 publications

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“…In the previous work, Cd could be 100% trapped on the surface of foamed nickel at room temperature. However, the foamed platinum–nickel trap was first designed and utilized for the cotrapping of Hg and Cd.…”

Section: Resultsmentioning

confidence: 83%

“…After trapping, the Pt/Ni wafers must be heated to release Hg and Cd for AFS measurement like the previous study . Considering the cotrapping of Hg and Cd and the modified materials, the releasing conditions of GPE were reoptimized using 10 mg of the GSS-3a CRM sample, and the results are shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

“…After trapping, the Pt/Ni wafers must be heated to release Hg and Cd for AFS measurement like the previous study. 29 Considering the cotrapping of Hg and Cd and the modified materials, the releasing conditions of GPE were reoptimized using 10 mg of the GSS-3a CRM sample, and the results are shown in Figure 4a. With the increase of heating power, the Hg and Cd signals increased and reached a plateau from 180 to 200 W. Furthermore, the effect of releasing time was investigated, and the results are shown in Figure S3.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In our previous work, − the porous carbon furnace was frequently utilized as an ETV for the introduction of Cd. However, the porous carbon furnace and sample boat are independent and noncontacting, resulting in low-efficiency heat conduction and thus high-power consumption (∼200 W).…”

Section: Resultsmentioning

confidence: 99%

“…A tungsten coil (TC) is indeed a small size and low energy tool for GPE, while it is confronted with a low trapping efficiency for Cd (∼20%) due to its spatial structure and low specific surface area, correspondingly compromising the detection sensitivity. To improve the Cd trapping efficiency, Liu et al 29 utilized a foamed nickel trap (NT) as a novel enrichment material to preconcentrate Cd, and 100% trapping efficiency was first achieved for Cd via online GPE following ETV. However, Hg was also tested using this NT, and no obvious trapping was found.…”

Section: ■ Introductionmentioning

confidence: 99%

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Novel Platinum–Nickel Composite Trap for Simultaneous and Direct Determination of Mercury and Cadmium in Soil and Its Mechanism Study

Liu

Mao

et al. 2022

Anal. Chem.

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In this work, following a metal-ceramic heater (MCH) as an electrothermal vaporizer (ETV), a novel composite Pt/Ni trap based on platinizing the foamed nickel was first fabricated to trap Hg and Cd simultaneously. So, a solid sampling Hg–Cd analyzer was developed to simultaneously detect trace Hg and Cd in soil samples, mainly consisting of an MCH, a composite Pt/Ni trap, and an atomic fluorescence spectrometer (AFS). This small-size MCH-ETV system only consumes 100 W for the complete vaporization of Hg and Cd in soil matrices. The Pt/Ni trap fulfills the complete trapping of Hg and Cd following the solid sampling MCH-ETV system and then fast releases them by heating. It was proved that trapped and released Hg and Cd by the Pt/Ni trap are atomic species using X-ray photoelectron spectroscopy (XPS) and other approaches; specially, the effective cotrapping of Hg and Cd might be due to forming alloys of Hg + Pt and Cd + Ni on the Pt/Ni trap. Under the optimized conditions, the method detection limits (LODs) of Hg and Cd reached 0.4 μg/kg and 0.04 μg/kg for a 20 mg sample size, the relative standard deviations (RSDs) were within 12% and 8% for soil samples, respectively, and the recoveries ranged from 96% to 105%, indicating favorable analytical sensitivity, precision, and accuracy. The whole analysis time can be controlled within 5 min without the soil digestion process. The proposed Hg–Cd analyzer is thus suitable for rapid detection of Hg and Cd in soil samples with advantages such as simplicity, green, and safety. Further, the proposed solid sampling ETV-composite trap method has a promising application potential in the field and rapid detection for multielements.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%