Acceleration starts from sample pretreatment
2020-12-02
Sample pre-treatment accounts for 60% of the
sample analysis process and directly affects the test results. In ASTM D7303,
Standard Test Method for Determination of Metals in Lubricating Greases by
Inductively Coupled Plasma Atomic Emission Spectrometry, two methods for sample
pre-treatment of lubricating greases, the ashing method and microwave digestion
method, are explained.
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The ashing method, which
involves the thermal reaction of samples and concentrated sulfuric acid in a
platinum crucible, is usually time-consuming and dangerous, but the ashing
method is more commonly used because of its relatively low input cost.
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The other microwave digestion
method puts the sample and concentrated nitric acid or other appropriate
inorganic acid into a PTFE digestion vessel and react in a microwave digestion
apparatus. The reaction time is short, and multiple samples can be taken at one
time, but the microwave digestion equipment is expensive to purchase.
With a growing awareness of
safety and efficiency, microwave digestion have become the laboratory of
choice. Similarly, for the sake of efficient test results and safety of
employees, Runningland has replaced the more commonly used ashing method with
microwave digestion method this year and currently in operational use. This new
additional equipment can complete test projects much more efficiently.