Flow injection sample introduction methods for atomic-absorption spectrometry

Tyson, Julian F.; Appleton, John M. H.; Idris, Ahyar B.

doi:10.1039/an9830800153

Cited by 28 publications

(12 citation statements)

References 3 publications

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“…With .the incorporation of a flow-injection dilution system, the sample could be diluted on-line for further measurements. Examples of dilution based on flow injection include zone sampling [9], variable volume injection [10], variable dispersion [11] and confluence dilution [12]. The concentration could then be calculated from the normal calibration curve already obtained and fitted by the computer, together with the relevant dispersion information.…”

Section: Resultsmentioning

confidence: 99%

A microcomputer-based peak-width method of extended calibration for flow-injection atomic absorption spectrometry

Bysouth

Tyson

1986

Analytica Chimica Acta

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Section: Resultsmentioning

confidence: 99%

A microcomputer-based peak-width method of extended calibration for flow-injection atomic absorption spectrometry

Bysouth

Tyson

1986

Analytica Chimica Acta

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“…For determination of the elements the application of hydride generation (HG) techniques to AAS is well established [25]- [27]. Flow injection analysis (FIA) has been widely used, mainly in the field of colorimetry [28], also it was applied as an automatic sample injection technique for flame AAS [29]- [31]. It was used as an on-line pretreatment method for AAS to concentrate by chelate resin [32] or solvent extraction [33] and to remove interferences by ion-exchange [34].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Trace Elements in Fly Ash Released from Coal Combustion

Eltayeib¹

2014

OALib

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Qingshan Thermoelectric Plant located in Wuhan City, Hubei Province, China, and it uses coal as a fuel. Coal combustion generates not only gaseous pollutants like SO 2 and NO x but also toxic and heavy metals to the atmosphere. From the environmental point of view, the determination and speciation of trace toxic and heavy metals released from coal combustion are very important. In this work, the atomic spectroscopic methods for determination of some trace elements were first established. Graphite furnace atomic absorption spectrometry (GFAAS) method was used to determine the trace Pb in standard reference material SRM 8322 (fly ash from combustion of pulverized coal). The hydride generation atomic absorption spectrometry coupled with flow injection analysis (HGAAS-FIA) was used to analyze the concentration of As in SRM 8322 and the ICP-AES for determination of trace elements Co, Ni, Cu, Cr, etc. For the laboratory research work, all the coal samples were digested with a mixture of acids (HNO3-HF-HCLO4) after burned at 650˚C for one hour. Based on the establishment of atomic spectroscopic determination methods Tessier sequential speciation and separation methods were used in the studies of speciation distribution of some heavy metals in fine particles released from coal combustion of Qingshan Thermoelectric Plant. The transition elements in two samples from Qingshan Thermoelectric Plant (with different combustion condition) were extracted into five fractions by sequential extraction. In each fraction a suitable reagents with an optimum pH and time were used. Centrifugate separation of liquid part from the solid part was used after each fraction, the liquid part is taken for analysis and the solid part was extracted with a suitable reagents for the next fraction and the reaction continued for certain time. This procedure was done for the five fractions (exchangeable, carbonate bounded, Fe-Mn oxide bounded, organic matter bounded and residual). The experiment of the stimulant acid rain reacted with coal ash were also done in order to evaluate the transformation of these trace elements into water system after the fine particles of coal ash act with acid rain. The results showed that most parts of the metal in particles are stable. In order to study the distribution tendency of trace elements in coal, the separation of different coal particles were done using organic solvent extraction and gravity settlement method. The results showed that different trace elements had different distribution tendency in coal.

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“…In this case, one of the solutions should be the sample and the volume ratio between solutions 1 and 2 is chosen according to the requirements of the methodology that is being used. For example, in the original work [33], dilution of a blood plasma sample (diluting solution in larger volume) was performed for determination of glucose and addition of reagents (in smaller volume) was used for determination of nitrite in natural waters. Besides these applications, Silva and Pasquini [51] also used the SMI approach to develop a bisegmented¯ow system for gas analysis.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous multiple injection to perform titration and standard addition in mono-segmented flow analysis

Raimundo¹

2001

Journal of Automated Methods & Management in Chemistry

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An automated system to perform titration and standard addition in monosegemented £ow analysis by employing the simultaneous multiple injection is described. The system was controlled by a PC-AT-386 microcomputer through a home-made parallel interface, employing a diode array spectrophotometer as detector. Software was written in QuickBasic 4.5 to control the system and for data acquisition. A three-way solenoid valve was used in conjunction with a proportional injector to add the titrant solution or the standard solution to the sample, to carry out titration or standard addition, respectively. Only one standard solution was used in each procedure and di¡erent quantities of titrant or standard were added to the sample by controlling the time interval in which the solenoid valve was switched on. Titration and standard addition curves similar to those of the manual methods were obtained in both cases, since the sample dispersion was very low due to the air bubbles of the monosegment. The titration system was evaluated through the determination of Fe(II) with a KMnO 4 standard solution in pharmaceutical preparations. The standard addition process was assessed by determining Cr(VI) in natural waters and domestic wastewater using the diphenylcarbazide method. The results obtained in both methodologies did not di¡er signi¢cantly from the reference methods at a 95% con¢dence level.

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Flow injection sample introduction methods for atomic-absorption spectrometry

Cited by 28 publications

References 3 publications

A microcomputer-based peak-width method of extended calibration for flow-injection atomic absorption spectrometry

A microcomputer-based peak-width method of extended calibration for flow-injection atomic absorption spectrometry

Estimation of Trace Elements in Fly Ash Released from Coal Combustion

Simultaneous multiple injection to perform titration and standard addition in mono-segmented flow analysis

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