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Saturday, February 8, 2020 | History

3 edition of A microwave system for the acid dissolution of metal and mineral samples found in the catalog.

A microwave system for the acid dissolution of metal and mineral samples

S. A. Matthes

A microwave system for the acid dissolution of metal and mineral samples

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  • 20 Currently reading

Published by U.S. Dept. of the Interior, Bureau of Mines in Pgh [i.e. Pittsburgh], Pa .
Written in English

    Subjects:
  • Metallurgical analysis.,
  • Solution (Chemistry)

  • Edition Notes

    Statementby S.A. Matthes, R.F. Farrell, and A.J. Machie.
    SeriesBureau of Mines technical progress report -- 120.
    ContributionsFarrell, Raymond F., Mackie, A. J., United States. Bureau of Mines.
    The Physical Object
    FormatMicroform
    Pagination9 p.
    ID Numbers
    Open LibraryOL17704580M

    Hale, M. Acta Part B 57, — Google Scholar Its oxidising potential is enhanced with increased temperature and pressure. Sodium nitrate pro analysis grade was obtained from Carl Roth Germany. Multielemental inductively coupled plasma optical emission spectrometry analysis of nickeliferous minerals.

    As microwave heating is internal as well as external, the heat conduction stage is avoided because energy is instantly transferred to the sample by absorptive polarization rather than molecular collisions [ 10 ]. Hydrogen peroxide was used to enhance the destruction of organic matter. Since different types of sample behave differently in microwave field, heating control is necessary in this operation Journal of Agronomy and Crop Science1 To avoid redispersion of the nanoparticles, 1. What concentration?

    During the digestion process of samples containing organic compounds, largely insoluble gases such as CO2 are formed. In the present study, the three digestion methods reported above were compared for the analysis of eight agricultural soil samples collected at an Italian reference site, previously characterized within the framework of an APAT project focused on soil sampling uncertainty evaluation [ 1617 ]. This can create large thermal convection currents which can agitate and sweep away the stagnant surface layers of dissolved solution and thus, expose fresh surface to fresh solution. Smith, F.


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A microwave system for the acid dissolution of metal and mineral samples by S. A. Matthes Download PDF Ebook

Thus, heavy nonporous materials such as fuel oils or coke are not as efficiently dissolved by microwave heating. Low solubility of calcium carbonate or calcium hydroxide mean they are not ideal to be used in a solution for neutralisation see Table 3.

Subramanian, K. Hale, M. Ito, J. The values given in parentheses are mathematical conversion to inch-pound units that are provided for information only and are not considered standard.

Ming Chen, Lena Q. For HF, all skin contact should be treated has potentially hazardous to life. Applied Geochemistry14 3 Barnes, R. Furthermore, many techniques are only suitable for specific samples or sample matrices or are limited to a certain range of, e.

Introduction Measurement of trace-element mass concentrations in soils is the first step in evaluating their potential health or ecological hazard.

Irrespective of the separation method applied, a precise quantification of the total mass concentrations of the different fractions is indispensable, not at least because the actual dose metric-based risk assessment demands for an exact determination to enable a comparison with the results of former exposure or eco toxicological studies [ 1 — 3 ].

INAA data are reported with their standard deviation from counting statistics in gamma spectrometry.

The use of hydrofluoric acid in the laboratory

This filtrate was used for estimation of other radicals. Metal salts of nitric acid are generally very soluble in water except gold, platinum group metals, Al, Ti, Cr, and Zr. Since different types of sample behave differently in microwave field, heating control is necessary in this operation Its oxidising potential is enhanced with increased temperature and pressure.

Mamble, K.

Sample Decomposition Techniques in Inorganic Trace Elemental Analysis

Published26 Jun Abstract The use of microwave digester for digestion of alloy and slag samples of smelted ocean bed polymetallic nodules has permitted the complete digestion of samples, thereby replacing the tedious classical A microwave system for the acid dissolution of metal and mineral samples book of digestion of samples.

Mines1—9 Google Scholar Qi Liang, D. Although hydrofluoric acid HF is a weak acid it does attack silicates very effectively, and most oxides-although not, for example, spinels and zircons [3].

Based on the current results, the optimal approach for the removal of sludge heels for HLW tanks would include the following steps: 1 removal of the maximum possible amount of heel materials by mechanical means; 2 neutralization and acidification of the heel using dilute mineral acid This step should promote significant dissolution of certain metal hydroxides and salts, including gibbsite.

In: Fachetti, S. However, if you need to use it then it can be handled effectively and safely with appropriate precautions. Sansoni, B. Introduction to Microwave Sample Preparation.

To avoid biases by potential oxidation processes, combustion experiments were conducted in a nitrogen as well as atmospheric atmosphere. Measurements were carried out on a Perkin-Elmer atomic-absorption spectrophotometer.

Microwave oven is acting as a source of intense energy to rapidly heat the sample. Despite these positives the neutralisation of HF by boric acid does have a down side.

Prediction of Cadmium uptake by brown rice and derivation of soil—plant transfer models to improve soil protection guidelines."An Expert-Database System for Sample Preparation by Microwave Dissolution. II. Electronic Transfer and Implementation of Standard Methods" J.

Chem. Inf. Comput. Provides a theoretical basis for understanding microwave acid sampling requiring elemental or chemical analysis. Describes techniques and equipment found most effective. Gives direct practical applications of the methods to a variety of sample types. Covers most aspects of closed vessel microwave digestion and open vessel acid composition.

This involves digestion of the sample in concentrated nitric acid on a hot plate, followed by hydrogen peroxide to further oxidize organics and solubilize metals. This works well for highly organic samples (e.g., plant tissue) but does not work as well for soils and rock material.°C and psi. This chapter considers pdf of decomposing and dissolving real samples.

Acid decomposition, microwave, combustion, and fusion methods are considered. Decomposing and Dissolving the Sample 1For an extensive discussion of this topic, see R.

Bock, A Handbook of Decomposition Methods in.Microwave Acid Digestion Vessels In addition to unique acid digestion vessels, Parr offers a line of chemically-inert vessels in which microwave heating can be used for rapid sample dissolution in .Validation of a Simple Microwave-Assisted Acid Digestion Method Ebook become the preferred methodology for the analysis of metals in environmental samples including PM [].

This the traditional ICP-MS systems are equipped with liquid sample introduction systems which require the dissolution of solid samples prior to measurements.