Fundamental and practical considerations in the design of on-line column preconcentration for flow-injection atomic spectrometric systems

Fang, Zheng; Xu, Shukun; Zhang, Suchun

doi:10.1016/s0003-2670(00)83756-3

Cited by 85 publications

(13 citation statements)

References 16 publications

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“…Other important parameters in the development of solid-phase preconcentration methods, such as consumption index (CI), which is dened as the volume required to attain a unit of EF, and the concentration efficiency (CE), dened as the EF obtained by operating the preconcentration system for 1 min, were also calculated. 43 CI and CE were found to be 0.40 mL and 9.76 min À1 , respectively. The sample throughput of the proposed method was 15 h À1 .…”

Section: Analytical Characteristics Of the Proposed Methodsmentioning

confidence: 90%

Study on the performance of micro-flow injection preconcentration method on-line coupled to thermospray flame furnace AAS using MWCNTs wrapped with polyvinylpyridine nanocomposites as adsorbent

et al. 2017

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This work describes the synthesis and characterization of a new adsorbent nanocomposite based on multiwalled carbon nanotubes (MWCNTs) and polyvinylpyridine and its use in the development of a highly sensitive micro-flow injection preconcentration method coupled to TS-FF-AAS for the determination of very low levels of Cd. The characterization of the nanocomposite was performed by FT-IR, TGA, SEM, TEM and textural data measurements using the BET and BJH methods. The optimized conditions of the micro-flow injection preconcentration method involved a preconcentrated sample (8.8 mL) at pH 8.0 flowed through 50.0 mg of nanocomposite packed into a mini-column at a flow rate of 4.4 mL min À1.The on-line elution of Cd(II) ions towards the TS-FF-AAS detector was carried out in countercurrent at a flow rate of 0.6 mL min À1 using 1.0 mol L À1 HCl. The analytical curve ranged from 0.12 to 6.0 mg L À1 (r ¼ 0.997), and an enhancement factor of 19.5, sample throughput of 15 h À1 and consumptive index of 0.45 mL were achieved. In terms of sensitivity, the uniquely high adsorption capacity of the nanocomposite was confirmed by the low limit of detection (36 ng L À1) achieved after implementing the preconcentration step in TS-FF-AAS. In terms of selectivity, the proposed method was shown to be tolerable to several foreign ions and applicable to different kinds of waters (tap, mineral, lake, and synthetic seawater), cigarettes, a food sample (powder chocolate), a medicinal herb (Ginkgo biloba) and a certified reference material (fish protein DORM-3).

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Section: Analytical Characteristics Of the Proposed Methodsmentioning

confidence: 90%

Study on the performance of micro-flow injection preconcentration method on-line coupled to thermospray flame furnace AAS using MWCNTs wrapped with polyvinylpyridine nanocomposites as adsorbent

et al. 2017

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“…An Instrumentation Laboratory AA spectrometer (Model 210 VGP) was used for all measurements. The operating conditions were wavelength, 240 nm; slit width, 2 Å; lamp current, 6.5 mA; burner height, 5 mm; air flow rate, 5 L min-1 ; and acetylene flow rate, 5 L min- 1 . The absorbance time response was monitored on an x-t chart recorder (L-250) and quantitative analysis was based on measurement of the peak height of the transient signals.…”

Section: Methodsmentioning

confidence: 99%

Online Trace Enrichment and Determination of Cobalt Ion as an Anionic Complex by Flow Injection Atomic Absorption Spectrometry

Dadfarnia

Jafarzadeh

1999

Microchemical Journal

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“…Schematic diagram of the flow system used for the preconcentration and determination of lead by FAAS. P1 (5.80 mL min -1 ); P2 (5.5 mL min -1 ); P peristaltic pump; C polyurethane foam/TAM minicolumn; V four-way valve; FAAS flame atomic absorption spectrometer; W waste; A four-way valve in the preconcentration step; B four-way valve in the elution position been recommended [22,23] to simplify the on-line system (avoiding an additional line with buffer solution) and to increase the concentration efficiency (CE). This strategy causes a small loss of analyte, but it does not deteriorate the preconcentration system, since this loss should always be reproducible for both standards and samples.…”

Section: On-line Preconcentration Systemmentioning

confidence: 99%

Use of factorial design and Doehlert matrix for multivariate optimisation of an on-line preconcentration system for lead determination by flame atomic absorption spectrometry

et al. 2003

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A system for on-line preconcentration and determination of lead by flame atomic absorption spectrometry (FAAS) was proposed. It was based on the sorption of lead(II) ions on a minicolumn of polyurethane foam loaded with 2-(2-thiazolylazo)-5-dimethylaminophenol (TAM). The optimisation step was carried out using two-level full factorial and Doehlert designs for the determination of the optimum conditions for lead preconcentration. The proposed procedure allowed the determination of lead with a detection limit of 2.2 microg L(-1), and a precision, calculated as relative standard deviation (RSD), of 2.4 and 6.8 for a lead concentration of 50.0 and 10.0 microg L(-1), respectively. A preconcentration factor of 45 and a sampling frequency of 27 samples per hour were obtained. The recovery achieved for lead determination in the presence of several cations demonstrated that this procedure has enough selectivity for analysis of environmental samples. The validation was carried out by analysis of certified reference material. This procedure was applied to lead determination in natural food.

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Fundamental and practical considerations in the design of on-line column preconcentration for flow-injection atomic spectrometric systems

Cited by 85 publications

References 16 publications

Study on the performance of micro-flow injection preconcentration method on-line coupled to thermospray flame furnace AAS using MWCNTs wrapped with polyvinylpyridine nanocomposites as adsorbent

Study on the performance of micro-flow injection preconcentration method on-line coupled to thermospray flame furnace AAS using MWCNTs wrapped with polyvinylpyridine nanocomposites as adsorbent

Online Trace Enrichment and Determination of Cobalt Ion as an Anionic Complex by Flow Injection Atomic Absorption Spectrometry

Use of factorial design and Doehlert matrix for multivariate optimisation of an on-line preconcentration system for lead determination by flame atomic absorption spectrometry

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