Primjena spektrometrijskih metoda u analizi metalurških uzoraka

Štrkalj, Anita; Glavaš, Zoran

doi:10.15255/kui.2015.036

Cited by 3 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The value of ΔS° is 15.17 j/ molk, indicating an increased randomness during adsorption of Cu (II) ions on waste foundry molding sand. The results obtained in this research are comparable to the results in the literature [11,25].…”

Section: Resultssupporting

confidence: 91%

Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions

Štrkalj

Glavaš

Slokar

2016

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

MIcrostructural and equIlIbrIuM adsorptIon study of the systeM of waste foundry MoldIng sand/cu (II) IonsThis paper deals with the waste foundry molding sand which originally comes from the casting production. Adsorption of Cu (II) ions on the waste foundry molding sand was studied. Experimental data were processed using adsorption isotherms. obtained results show that the experimental data are best described by the Langmuir isotherm. The following adsorption capacities are obtained: 7.153 mg/g to 293 k, 8.403 mg/g at 333 k and 9.208 mg/g at 343 k. The kinetics and thermodynamics of the process were analysed. The obtained results indicate that the adsorption process takes place according to the pseudo second order kinetic model with the following constants: 0.438 g/mg min at 293 k, 0.550 g/mg min at 333 k and 1.872 g/ mg min at 343 K. The following values of ΔG° were obtained: -95.49 j/mol at 293 k, -736.99 j/mol at 333 k and -1183.46 J/mol at 343 K. The value of ΔH° is -4.16 kJ/mol and the value of ΔS° is 15.17 j/molk. These results were confirmed by microscopic examinations. The results indicate that the adsorption process of Cu (II) ions on waste foundry molding sand is possible. Results of microscopic examinations show the homogeneity of the surface, which is proof of the chemisorption. Cu (II) ions on the surface of the waste foundry molding sand were detected after adsorption by EDS analysis, which proves the existence of the adsorption process.

show abstract

Section: Resultssupporting

confidence: 91%

Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions

Štrkalj

Glavaš

Slokar

2016

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

show abstract

“…Currently, the ICP-OES technique is used to determine almost all elements of the periodic table, with an adequate selection of burners, mixing chambers and optimization of working conditions (Mandal, Banjanin, Kujović, & Malenica 2015;Medenica & Malešev 2002;Durović et al 2017). The absorption of precisely defined monochromatic radiation obtained by specific prisms or gratings is the basis of the spectrophotometric method (Jelić 2002;Štrkalj & Glavaš 2016). UV-VIS spectrophotometry involves the absorption of photons in the ultraviolet (UV) and visible (VIS) regions of the spectrum, which induces electron excitation.…”

Section: Introductionmentioning

confidence: 99%

Introduction of the Inductively coupled plasma (ICP–OES) method for the characterization of ”Guber” Srebrenica mineral waters

Lazić,

Radić,

Kešelј

et al. 2023

J. eng. process. manag.

View full text Add to dashboard Cite

<p>The mineral waters of "Guber" Srebrenica are highly mineralized waters with a significant content of soluble iron. They belong to iron-sulfate waters, which are rich in arsenic and therefore also called iron-arsenic waters with low pH values. Some of the "Guber" waters of Srebrenica were used for therapeutic purposes in the past. Spectrophotometric methods were used for their characterization. Today, instrumental methods are known which are faster and more efficient. This work focusses on using the Inductively Coupled Plasma - Optical Emission Spectrometry (ICP-OES) for the characterization of Guber Srebrenica mineral waters. Two standards were used to determine the elemental composition of these mineral waters, which differ in concentration and number of elements present. The results obtained by this method for soluble iron from different sources were compared with the spectrophotometric method of iron determination. The obtained results show that the lower iron concentrations in the samples obtained by the ICP method coincide with the results of the spectrophotometric method. However, with higher concentrations of iron (Očna voda), the deviations of the ICP method from the standard spectrophotometric method are greater and this may be the subject of further research. There are also discrepancies in the results between the standards for lead and arsenic, with higher values occurring in the samples where standards with a smaller number of present elements were used, which necessitates the use of standard methods.</p>

show abstract

“…There are numerous examples of ICP-OES application, including: determination of Fe, Co, Mn, Cu, Pb and Zn in ores [11], selected metals in surface waters [12], determination of steel composition [13], analysis of metallurgical samples [14], multielement analysis of apple peel [15], detection of heavy metals in biological material [17], analysis of hazardous waste [17], determination of silicon dioxide in bauxite [18], determination of mercury in freshwater fish [19], determination of trace elements in human breastmilk and baby formulas [20].…”

Section: Introductionmentioning

confidence: 99%

Determination of Iron Content in Natural Mineral Water: Comparison of Icp-Oes and Spectrophotometric Method

Lazić

Blagojević

Kešelj

et al. 2023

View full text Add to dashboard Cite

Crni Guber natural mineral water belongs to a group of highly mineralized iron-arsenic waters, which can be used for therapeutic purposes. In order to determine a more precise and accurate method for determining iron content, a comparison of ICP-OES and spectrophotometric method was performed. For the purposes of analysis using the ICP-OES method water samples were prepared with identical and different dilutions compared to the samples for the analysis performed using the spectrophotometric method. The G-test was used to check for the existence of outlier values in the obtained results, while the precision and accuracy of the method were verified by using the F-test and t-test. The aforementioned tests showed that the spectrophotometric method was more precise and accurate when the samples were prepared with identical dilution. When analyzing samples with different dilutions, the spectrophotometric method proved to be more precise, while in terms of accuracy there was no statistically significant difference between the methods.

show abstract

Primjena spektrometrijskih metoda u analizi metalurških uzoraka

Cited by 3 publications

References 1 publication

Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions

Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions

Introduction of the Inductively coupled plasma (ICP–OES) method for the characterization of ”Guber” Srebrenica mineral waters

Determination of Iron Content in Natural Mineral Water: Comparison of Icp-Oes and Spectrophotometric Method

Contact Info

Product

Resources

About