If an X-ray test returns a “not detected” result, do suppliers need to use a more accurate method to get an exact concentration?
X-ray fluorescence (XRF) testing is useful in screening for many elements, while engineering knowledge also can help to identify others. In general, for the elements lead (Pb), mercury (Hg) and cadmium (Cd), the XRF scan is sufficient — assuming the equipment is 10 times more sensitive than the acceptance thresholds of 1000 ppm (100 ppm for Cd). However, if the result is close to the acceptance limit, a more accurate test method should be used. XRF will only reveal total chromium (Cr) and bromine (Br), used in polybrominated diphenyl (PBBs) and polybrominated diphenyl ether (PBDEs) controlled substances. The more specific methods are colorimetric (diphenylcarbazide) for Cr VI and one of high-performance liquid chromatography (HPLC), gas chromatography-mass spectrometry (GCMS) or Fourier Transform Infra Red spectroscopy (FTIR) for the PBB/PBDEs. Tests for Cr VI should be undertaken if a chromate dip finish is present. Tests for PBB/PBDEs should be undertaken if an unknown flame retardan
Related Questions
- For the query SELECT ID AS X FROM TEST the method ResultSetMetaData.getColumnName() returns ID, I expect it to return X. Whats wrong?
- If an X-ray test returns a "not detected" result, do suppliers need to use a more accurate method to get an exact concentration?
- Is the machine used to test my breath alcohol concentration accurate and reliable?
