Application of ion chromatography for determination of selected elements in coal and oil shale

Nadkarni, R.A.; Pond, David M.

doi:10.1016/s0003-2670(00)80614-5

Cited by 26 publications

(11 citation statements)

References 3 publications

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“…The most suitable sample pretreatment techniques for posterior Cl determination include combustion techniques [9,10], acid digestion [11], extraction and dilution procedures after alkaline fusion [12,13]. The main disadvantages of sample pretreatment are related to the need of additional equipment, reagents, and the possibility of contamination and analyte loss.…”

Section: Introductionmentioning

confidence: 99%

Strontium mono-chloride — A new molecule for the determination of chlorine using high-resolution graphite furnace molecular absorption spectrometry and direct solid sample analysis

Pereira

Welz

Lopéz

et al. 2014

Spectrochimica Acta Part B: Atomic Spectroscopy

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A new method has been developed for the determination of chlorine in biological reference materials using highresolution continuum source graphite furnace molecular absorption spectrometry (HR-CS GF MAS) of the strontium mono-chloride (SrCl) molecule and direct solid sample analysis. The use of the SrCl molecule for high-temperature MAS was not described up to now in the literature. Preliminary time-dependent density functional theory calculations of the SrCl structure were carried out in order to obtain reasonable estimates of the absorption spectrum of the target molecule. The calculations, which were carried out at BHandHLyp/def2-QZVP level of theory, proved a very accurate and inexpensive way to get information about the spectrum of the SrCl molecule, which enabled us to perform the Cl determination with good sensitivity and specificity. The molecular absorption of the SrCl molecule has been measured using the wavelength at 635.862 nm, and zirconium and palladium have been evaluated as the chemical modifiers in order to increase the sensitivity of the gaseous SrCl molecule generated in the graphite furnace. The pyrolysis and vaporization temperatures were 600°C and 2300°C, respectively. Accuracy and precision of the method have been evaluated using biological certified reference materials of both animal and plant origins, showing good agreement with the informed and certified values. Limit of detection and characteristic mass were 1.0 and 2.2 ng, respectively. The results found using HR-CS GF MAS were in agreement (95% confidence level) compared to those obtained by electrothermal vaporization-inductively coupled plasma mass spectrometry.

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Section: Introductionmentioning

confidence: 99%

Strontium mono-chloride — A new molecule for the determination of chlorine using high-resolution graphite furnace molecular absorption spectrometry and direct solid sample analysis

Pereira

Welz

Lopéz

et al. 2014

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…During combustion, halogens are dominantly released as hydrogen halides. Instead of N2H4 (Nadkarni and Pond 1983), H2O2 was added as a reducing agent to the absorption solution to convert halogen species into the corresponding halide. Hydrogen peroxide was selected since it exhibits oxidizing and reduction properties, depending on the conditions.…”

Section: Fractional Factorial Designmentioning

confidence: 99%

“…Sulfur, N, F, and Cl in coal and oil shale were determined by oxygen bomb combustion, using water and dilute sodium carbonate as the absorbing media with hydrazine as the reducing reagent (Nadkarni and Pond 1983). For oil shale combustion, white oil was added as a combustion aid.…”

Section: Introductionmentioning

confidence: 99%

Experimental Design Optimization of the Determination of Total Halogens in Coal by Combustion–Ion Chromatography

et al. 2015

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Determination of total halogens in coal was investigated with oxygen bomb combustion followed by ion chromatography. Experimental parameters were optimized by fractional factorial design Downloaded by [University of Otago] at 10:25 05 July 20152 and response surface methodology. Fractional factorial design was employed in screening experiments to evaluate the influence of the oxygen pressure, catalyst, absorption solution, reduction reagent, bomb cooling time, and a combustion aid on the combustion of coal in an oxygen bomb. Response surface methodology was conducted to further refine the results obtained by fractional factorial design and to define parameters for the procedure. The accuracy and precision of combustion with ion chromatography were evaluated by the use of two certified reference materials and by fortified in-house coal standards. The limits of detection and quantification for total halogens were 0.84 and 2.80 milligrams per kilogram, respectively, for 500 milligrams samples. Ion chromatography provided relative standard deviations less than 4 percent, recoveries exceeding 95 percent, and was convenient. This method is recommended for routine determination of total halogens in coal because of its reliability.

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“…Kompleksometrijski kalcijum određen je tako što se otpipetira 100 cm 3 uzorka, doda 5 cm 3 rastvora NaOH (kako bi se istaložio magnezijum) i oko 0,2 g mureksida (na vrh kašičice), i titriše rastvorom K-III do promene boje indikatora. Određivanje katjona i anjona jonskom hromatografijom (IC) (Fotić i Laušević, 1990;Fritz and Gjerde, 2000;Viehwager, 2007;Weiss, 2004;Cerjan-Stefanović, 1992;Nadkarni and Pond, 1983): Instrument korišćen u ovom radu je Metrohm, 761 Compact IC. Separaciona kolona za razdvajanje anjona je Metrosep A supp 1-250 (6.1005.300).…”

Section: Materijal I Metodeunclassified

An application of classical and instrumental methods of analysis in quality control of beer

Rajković

Ignjatović

et al. 2015

J AGR SCI BELGRADE

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In order to control the quality of beer and raw materials for production of beer in Belgrade Beer Industry (BIP), water is analyzed (city, technological and demineralized water). Measurements of pH values indicated the increased pH values in the sample of tehnological water, which had no impact on wort hopping, since the tested samples of wort, young beer and final product had a pH value within the expected range. After processing city water, a sample of tehnological water was found with increased carbonate hardness, which is caused by the increased content of sodium hydrogen carbonate. Analysing the titration alkalinity, titration acidity and buffering power, it was found that the alkalinity was decreasing which is in accordance with the determination of pH values of wort and beer samples (young beer and final product). Analyzing the content of anions and cations in the examined water samples, it has been shown that the concentration of these examinated anions (Cl-, NO3 -, SO4 2- and PO4 3-) and cations (NH4 +, Na+, K+, Ca2+, Mg2+) are within the limits prescribed by the Regulations on hygienic safety of drinking water, and thus by the Regulations of quality and other requirements for beer. The contents of anions in wort and beer samples (young beer and final product) were determined by ion chromatography method. The contents of sulphate and nitrate ions were within the recommended limits. The concentration of chloride ions was above 150 mg/dm3, which may have an impact on the sensory properties of beer, while changes in the content of phosphate ions were insignificant. [Projekat Ministarstva nauke Republike Srbije, br. III 43009]

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Application of ion chromatography for determination of selected elements in coal and oil shale

Cited by 26 publications

References 3 publications

Strontium mono-chloride — A new molecule for the determination of chlorine using high-resolution graphite furnace molecular absorption spectrometry and direct solid sample analysis

Strontium mono-chloride — A new molecule for the determination of chlorine using high-resolution graphite furnace molecular absorption spectrometry and direct solid sample analysis

Experimental Design Optimization of the Determination of Total Halogens in Coal by Combustion–Ion Chromatography

An application of classical and instrumental methods of analysis in quality control of beer

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