Sample Preparation of Plastics
Plastic samples present some special challenges since they come in numerous forms, powders, pellets, fibers, sheets, and variously shaped solids, and cannot be prepared by most of the usual methods.
Sample Preparation of Loose Powders
The simplest approach to analyzing a loose powder sample is to simply fill a sample cup approximately ¾ full and analyze it without any additional preparation, or simply tapping the cup on a clean surface to pack it to a more consistent density.
Sample Preparation of Liquids
Liquid samples can be the easiest or most difficult samples to work with depending on the composition and stability. A sample cup is filled about ¾ full and then presented to the analyzer.
Sample Preparation of Films
Window (aka Sample Support) Film
A variety of window films are available to fill a variety of needs. Decisions on the type of film to use are made based on factors such as cost, x-ray transmission, chemical resistance, reproducibility, and ease of use.
Sample Preparation Equipment
There are a wide variety of sample cups available with many features. To best compare them we will compare each feature, and show when it is beneficial.
Selecting the Acquisition Conditions
Choosing optimal acquisition conditions for XRF analysis is a complex and critical part of the art. Selecting the proper acquisition conditions can mean the difference between measuring an element at PPM levels, or not seeing it at all. There are two fundamental principles that must be met to achieve optimal analysis conditions.