Dc Plasma Arcs for Elemental Analysis

1977 ◽  
Vol 31 (4) ◽  
pp. 273-283 ◽  
Author(s):  
Christopher D. Keirs ◽  
Thomas J. Vickers
Keyword(s):  
Inductively Coupled Plasma ◽  
Plasma Jets ◽  
Local Thermal Equilibrium ◽  
Emission Spectrometry ◽  
Plasma Arc ◽  
Dc Plasma ◽  
Temperature Plasma ◽  
Inductively Coupled ◽  
Emission Limits ◽  
Made In

The development of plasma arc devices as replacements for chemical combustion flames in trace element analyses by emission spectrometry is traced with particular emphasis on those devices in which the spectrometric observation is made in the non-current-carrying portion of the discharge or “plume.” The question of local thermal equilibrium in both the arc column and plasma plume is discussed and the dependence of temperature on experimental variables is considered in terms of a model. In addition to the temperature attained, the performance of various gas stabilized arcs and plasma jets is discussed with reference to interferences, background emission, limits of detection, and precision. Particular attention is paid to the problem of sample aerosol introduction into the high temperature plasma. The dc plasma arc at its present level of development is compared with the inductively coupled plasma for use as a source in emission spectroscopy.

scholarly journals LABORATORY PRODUCTION OF HERB-MATE (ILEX PARAGUARIENSIS) FOR HOT MATE – A PARALLEL WITH THE CHARACTERISTICS OF PRODUCTS AVAILABLE ON THE MARKET

2019 ◽  
Vol 16 (32) ◽  
pp. 34-41
Author(s):  
Guilherme Rufatto SCHMIDT
Keyword(s):  
Inductively Coupled Plasma ◽  
Cadmium Concentration ◽  
Optical Emission ◽  
Raw Material ◽  
Emission Spectrometry ◽  
Ilex Paraguariensis ◽  
Inductively Coupled ◽  
Lead And Cadmium ◽  
Plasma Optical Emission Spectrometry ◽  
Made In

Herb-mate is a raw material of great importance to Southern Brazil, considering its annual production of approximately 650,000 tons of leaves. The hot mate, known as chimarrão, is the most appreciated beverage and its consumption is linked to the traditions and cultural habits predominantly in the south of the country. Considering its huge importance, the objective of the work was to evaluate the production of laboratory herbmate for chimarrão in order to establish a comparison with the products available on the market. Therefore, it was considered the current legislation and the analysis of its organoleptic and granulometric properties, humidity level and concentration of some toxic metals quantified by inductively coupled plasma optical emission spectrometry. The manufacturing of the final product was made in three steps: first of all, the leaves were submitted to direct fire, then they were dried at a temperature of 40 Cº for 24 hours and, finally, they were ground in a knife mill for 10 minutes. The obtained results showed, in most of the analyzed characteristics, a great similarity between the laboratorial and commercial herb, obtaining approval from 90% of chimarrão consumers who participated in the organoleptic tests. However, the coloration was considered darker and can be explained by logistic problems between the plantation and the laboratory. There was also a divergence in the metals analysis, which showed a higher lead and cadmium concentration when compared to the herbs found on the supermarket shelves. Alarming numbers for consumers were found, since the commercial herbs pointed levels above the recommended for all analyzed metals, which indicate the urgent need for better inspection, as well as improved manufacturing practices of the final product and a better raw material cultivation.

Silicate analysis of carbonated rocks using ICP-AES with calibration by the concentration ratio

2020 ◽  
Vol 86 (5) ◽  
pp. 16-21
Author(s):  
T. A. Karimova ◽  
G. L. Buchbinder ◽  
S. V. Kachin
Keyword(s):  
Inductively Coupled Plasma ◽  
Concentration Ratio ◽  
Total Error ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Calibration Error ◽  
Plasma Atomic Emission Spectrometry ◽  
Standard Samples ◽  
Inductively Coupled ◽  
Carbonate Materials

Calibration by the concentration ratio provides better metrological characteristics compared to other calibration modes when using the inductively coupled plasma atomic emission spectrometry (ICP-AES) for analysis of geological samples and technical materials on their base. The main reasons for the observed improvement are: i) elimination of the calibration error of measuring vessels and the error of weighing samples of the analyzed materials from the total error of the analysis; ii) high intensity of the lines of base element; and iii) higher accuracy of measuring the ratio of intensities compared to that of measuring the absolute intensities. Calcium oxide is better suited as a base when using calibration by the concentration ratio in analysis of carbonate rocks, technical materials, slags containing less than 20% SiO2 and more than 20% CaO. An equation is derived to calculate the content of components determined in carbonate materials when using calibration by the concentration ratio. A method of ICP-AES with calibration by the concentration ratio is developed for determination of CaO (in the range of contents 20 – 100%), SiO2 (2.0 – 35%), Al2O3 (0.1 – 30%), MgO (0.1 – 20%), Fe2O3 (0.5 – 40%), Na2O (0.1 – 15%), K2O (0.1 – 5%), P2O5 (0.001 – 2%), MnO (0.01 – 2%), TiO2 (0.01 – 2.0%) in various carbonate materials. Acid decomposition of the samples in closed vessels heated in a HotBlock 200 system is proposed. Correctness of the procedure is confirmed in analysis of standard samples of rocks. The developed procedure was used during the interlaboratory analysis of the standard sample of slag SH17 produced by ZAO ISO (Yekaterinburg, Russia).

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