In the contemporary era, it is opine that garabage production is increasing rapidly in community. However, this may cause damage to our environment. But would a help from government is really necessary to reduce the rubbish production? This essay will discuss the above notion in subsequent paragraph...
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YA metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality
A metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality lx2AK
A metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality.
Some assay methods are suitable for raw materials; others are more appropriate for finished goods. Raw precious metals (bullion) are assayed by an assay office. Silver is assayed by titration, gold by cupellation and platinum by inductively coupled plasma optical emission spectrometry (ICP OES). [1][2] Precious metal items of art or jewelry are frequently hallmarked (depending upon the requirements of the laws of either the place of manufacture or the place of import). Where required to be hallmarked, semi-finished precious metal items of art or jewelry pass through the official testing channels where they are analyzed or assayed for precious metal content. While different nations permit a variety of legally acceptable finenesses, the assayer is actually testing to determine that the fineness of the product conforms with the statement or claim of fineness that the maker has claimed (usually by stamping a number such as 750 for 18k gold) on the item. In the past the assay was conducted by using the touchstone method but currently (most often) it is done using X-ray fluorescence (XRF). XRF is used because this method is more exacting than the touchstone test. The most exact method of assay is known as fire assay or cupellation. This method is better suited for the assay of bullion and gold stocks rather than works of art or jewelry because it is a completely destructive method
A metallurgical assay is a compositional analysis of an ore,
metal
, or alloy, usually
performed in order to test
for purity or quality.
Some
assay methods
are suitable for raw materials; others are more appropriate for finished goods
. Raw precious metals
(bullion) are assayed
by an assay office. Silver is assayed
by titration, gold by cupellation
and platinum by inductively
coupled plasma optical emission spectrometry
(ICP OES
). [1][2] Precious metal
items of art or jewelry are frequently
hallmarked (depending upon the requirements of the laws of either the place of manufacture or the place of import). Where required to be hallmarked
, semi-finished precious metal
items of art or jewelry pass through the official testing channels where they are analyzed
or assayed for precious metal
content. While different
nations permit a variety of legally
acceptable finenesses
, the assayer is actually testing to determine that the fineness of the product conforms with the statement or claim of fineness that the maker has claimed (usually
by stamping a number such as 750 for 18k gold) on the item. In the past the assay was conducted
by using the touchstone method
but
currently
(most often
) it is done
using X-ray fluorescence (XRF). XRF is used
because
this method
is more exacting than the touchstone test
. The most exact method
of assay is known
as fire assay or cupellation
. This method
is better suited for the assay of bullion and gold stocks rather
than works of art or jewelry because
it is a completely destructive method
Do not write below this line
Official use only
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5.5
LR
5.0
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6.5
TA
5.0
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5.5
IELTS essay A metallurgical assay is a compositional analysis of an ore, metal, or alloy, usually performed in order to test for purity or quality
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metal
Some
methods
metals
cupellation
spectrometry
OES
metal
metal
metal
different
finenesses
method
but
often
because
method
method
cupellation
method
because
method
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