Sentence examples for test portion from inspiring English sources
noun
A measured amount (volume) of a test sample being used in a test.
However, there is more to selecting the test portion than "fine tuning" the analytical methodology.
In X-ray fluorescence spectrometry the test portion is typically only a few atomic layers.
Unfortunately, the analyst who works with solid samples has little choice in selecting the test portion size.
This suggests a warning to trace analysts: very reproducible results at very small test portion sizes may be erroneous.
A small test portion is weighed into a sample cup suspended above a small volume of absorbing solution.
The selection of a test portion from the test sample is the first step in any specific analytical determination.
If the test portion is a particulate solid, it may be necessary to convert it to a solution.
The dissolution of inorganic samples nearly always means the preparation of an acidic aqueous solution from the test portion.
For inorganic analytes it is possible to distinguish those that can sometimes be isolated directly from the undissolved test portion.
This technique uses a low-pressure oxygen plasma generated by high-frequency induction coils to remove organic matter from the test portion.
In many modern analytical procedures, once the test portion has been dissolved, it is diluted to some fixed volume and measured.
