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Prasad Madake
Copper
Asked: 2020-05-31T11:21:18+05:30 In:

We know that fire assay is one of the method of anyalysis how we can anyalyse or how we can determine composition of gold with this methode?

We know that fire assay is one of the method of anyalysis how we can anyalyse or how we can determine composition of gold with this methode?
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    1. Platinum⭐ Metallurgical and Materials Engineering student

      Fire assaying is the industry standard process for obtaining analytical gold and platinum group element (PGE) data from high grade ores. It is a modernized process but in its simplest form, has been in use for centuries. Fire assaying is used in the determination of gold in all sample types, includiRead more

      Fire assaying is the industry standard
      process for obtaining analytical gold
      and platinum group element (PGE) data
      from high grade ores. It is a modernized process but in its simplest form, has been in use for centuries. Fire assaying is used in the determination of gold in all sample
      types, including drill core, soil and chip samples.
      Gold can be analyzed by several
      methods:
      FLAME ATOMIC ABSORPTION (AA)
      • The sample is dissolved in aqua
      regia and then aspirated in an
      acetylene flame. A beam of light at
      a wavelength matching that of gold
      is passed through the flame. The
      gold in the sample absorbs the light
      proportionately depending on the
      concentration of the element in the
      solution. The absorption is compared
      to standard solutions to determine
      gold concentration in the sample.
      INDUCTIVELY COUPLED PLASMA-ATOMIC
      EMISSION SPECTROMETRY (ICP-AES)
      • The aqueous sample is aspirated
      into the plasma and the gold
      contained in the sample emits light
      at characteristic wavelengths. The
      intensities of the emitted light are
      measured and compared by software
      to those of standard gold-bearing
      solutions. The software then
      calculates the gold concentration in
      the sample.
      INDUCTIVELY COUPLED PLASMA-MASS
      SPECTROMETRY (ICP-MS)
      • The gold contained in the aqueous
      sample is ionized. The intensity of the
      signal at mass 186 is measured, as
      well as the signals of any potentially
      interfering isotopes. The intensity at
      186µ is measured and compared by
      software to those of standard goldbearing solutions to determine the
      concentration of gold in the sample.
      INSTRUMENTAL NEUTRON ACTIVATION
      ANALYSIS (INAA)
      • The residue is extracted from the
      filter paper and irradiated in the core
      of a nuclear reactor. Most elements
      become radioactive and emit gamma￾ray radiation of specific wavelengths.
      The wavelengths of gold are
      measured and compared against
      gold standards to determine the
      concentration of gold in the sample.

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