Lead determination at ng/mL level by flame atomic absorption spectrometry using a tantalum coated slotted quartz tube atom trap

Demirtaş, İlknur; Bakırdere, Sezgin; Ataman, O. Yavuz

doi:10.1016/j.talanta.2015.02.044

Cited by 44 publications

(15 citation statements)

References 23 publications

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“…Classical methods for lead determination rely on techniques such as flame atomic absorption spectrometry and inductively coupled plasma optical emission spectrometry . Nevertheless, these methods require expensive instrumentation and are difficult to use out of the laboratory, i. e. direct online measurements in the field without pre‐treatment are not possible.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Choline Oxidase Enzyme Inhibition Biosensor for Lead Ions Based on Multiwalled Carbon Nanotube Modified Glassy Carbon Electrodes

et al. 2017

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The determination of lead ions by inhibition of choline oxidase enzyme has been evaluated for the first time using an amperometric choline biosensor. Choline oxidase (ChOx) was immobilized on a glassy carbon electrode (GCE) modified with multiwalled carbon nanotubes (MWCNT) through cross‐linking with glutaraldehyde. In the presence of ChOx, choline was enzymatically oxidized into betaine at –0.3 V versus Ag/AgCl reference electrode, lead ion inhibition of enzyme activity causing a decrease in the choline oxidation current. The experimental conditions were optimised regarding applied potential, buffer pH, enzyme and substrate concentration and incubation time. Under the best conditions for measurement of the lowest concentrations of lead ions, the ChOx/MWCNT/GCE gave a linear response from 0.1 to 1.0 nM Pb2+ and a detection limit of 0.04 nM. The inhibition of ChOx by lead ions was also studied by electrochemical impedance spectroscopy, but had a narrower linear response range and low sensitivity. The inhibition biosensor exhibited high selectivity towards lead ions and was successfully applied to their determination in tap water samples.

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Section: Introductionmentioning

confidence: 99%

Highly Sensitive Choline Oxidase Enzyme Inhibition Biosensor for Lead Ions Based on Multiwalled Carbon Nanotube Modified Glassy Carbon Electrodes

et al. 2017

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“…Consequently, traceable and reliable measurement of Pb is essential for the safety and risk assessment for the wide use of traditional and medicinal herbs. Currently, there are some variety methods related to modern instrumentation that have been widely used for heavy metal determination; these include ICP (MS and AES) (Zhao et al 2012;Sorbo et al 2014;Deng et al 2015;Tai et al 2016) and AAS (Demirtaş et al 2015;Batista et al 2016;Zhong et al 2016). However, trace determination of Pb in herb samples is relatively inconvenient because of the matrix effect and low concentration of Pb.…”

Section: Introductionmentioning

confidence: 99%

Microextraction based on solidified floating organic drop coupled with ETAAS for the determination of lead in herbs

Thongsaw¹,

Sananmuang²,

Ross³

et al. 2017

Nova Biotechnologica Et Chimica

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A rapid, inexpensive and practical solidified of floating organic droplet microextraction (SFODME) prior to electrothermal atomic absorption spectrometry (ETAAS) was proposed for lead (Pb) determination in herb samples. For SFODME procedure, 1-(2-pysidylazo)-2-naphthol was used as a complexing agent. Analytical parameters influencing the extraction efficiency, i.e. types and volume of extracting solvent, concentration of 1-(2-pyridylazo)-2-naphthol, pH, extraction temperature and time were optimized. Under the optimized conditions, LOD and LOQ were 0.064 and 0.214 µg L -1 , respectively, and an enrichment factor was achieved at 18.71 with the relative standard deviation ranging from 1.3 to 2.5% (n=6). The proposed method was effectively applied to the determination of lead in Spinach leaves (SRM-1570a) and Thai herb samples with acceptable results.

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“…Later, Kratzer et al proved HG-DBD-AAS is suitable for Sb trapping/releasing . Compared to those thermal GPE methods using the graphite furnace, , quartz tube, − or metal materials, − the DBD trap consumes less energy. When heating a quartz tube trap/atomizer, the temperature gradient on the tube interior would reduce the efficiency and stability of releasing analyte, leaving some elemental residue in dead areas of the tube .…”

mentioning

confidence: 99%

“…When heating a quartz tube trap/atomizer, the temperature gradient on the tube interior would reduce the efficiency and stability of releasing analyte, leaving some elemental residue in dead areas of the tube . In contrast, NTP renders DBD trap no temperature gradient. , Furthermore, repeated heating and cooling that degrades quartz crystal structure and its trapping and releasing capacity was completely avoided by the ambient temperature DBD trap.…”

mentioning

confidence: 99%

“…28 In contrast, NTP renders DBD trap no temperature gradient. 10,12 Furthermore, repeated heating and cooling that degrades quartz crystal structure and its trapping and releasing capacity 23 was completely avoided by the ambient temperature DBD trap. Similar to the sputtering procedure, quick DBD release sharpens the signal peak and increases absolute sensitivity.…”

mentioning

confidence: 99%

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In Situ Dielectric Barrier Discharge Trap for Ultrasensitive Arsenic Determination by Atomic Fluorescence Spectrometry

Mao

Liu

et al. 2018

Anal. Chem.

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The mechanisms of arsenic gas phase enrichment (GPE) by dielectric barrier discharge (DBD) was investigated via X-ray photoelectron spectroscopy (XPS), in situ fiber optic spectrometer (FOS), etc. It proved for the first time that the arsenic species during DBD trapping, release, and transportation to the atomic fluorescence spectrometer (AFS) are probably oxides, free atoms, and atom clusters, respectively. Accordingly, a novel in situ DBD trap as a GPE approach was redesigned using three-concentric quartz tube design and a modified gas line system. After trapping by O at 9.2 kV, sweeping for 180 s, and releasing by H at 9.5 kV, 2.8 pg detection limit (LOD) was achieved without extra preconcentration (sampling volume = 2 mL) as well as 4-fold enhancement in absolute sensitivity and ∼10 s sampling time. The linearity reached R > 0.998 in the 0.1-8 μg/L range. The mean spiked recoveries for tap, river, lake, and seawater samples were 100-106%; and the measurements of the certified reference materials (CRMs) were in good agreement with the certified values. In situ DBD trap is also suitable to atomic absorption spectrometry (AAS) or optical emission spectrometry (OES) for fast and on-site determination of multielements.

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Lead determination at ng/mL level by flame atomic absorption spectrometry using a tantalum coated slotted quartz tube atom trap

Cited by 44 publications

References 23 publications

Highly Sensitive Choline Oxidase Enzyme Inhibition Biosensor for Lead Ions Based on Multiwalled Carbon Nanotube Modified Glassy Carbon Electrodes

Highly Sensitive Choline Oxidase Enzyme Inhibition Biosensor for Lead Ions Based on Multiwalled Carbon Nanotube Modified Glassy Carbon Electrodes

Microextraction based on solidified floating organic drop coupled with ETAAS for the determination of lead in herbs

In Situ Dielectric Barrier Discharge Trap for Ultrasensitive Arsenic Determination by Atomic Fluorescence Spectrometry

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