The customer reports contamination from powdery black material inside a silicone tube
Providing you with the Solution
The SEM-EDS elemental microanalysis of the black contaminating material show presence of copper and sulfur, silicon, oxygen and carbon.
Copper and sulfur indicate the presence of sulfur sulphides: the ratio in Cu/S atoms is about 1 and is indicative of copper sulfide II (CuS - black).
Silicon is attributable to silicone residues of the tube, while carbon and oxygen are partly referable to silicone residues and partly to other organic material.
CONTAMINATION --> CuS (black)
Chemical analysis (microanalysis) in the scanning electron microscope (SEM) is carried out by measuring the energy and intensity distribution of X-rays generated by the electron beam on the sample using an EDS detector (energy dispersion spectrometry).
SEM+EDS is a powerful means of investigation of chemically inhomogeneous solids at the microscopic scale and coatings.
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