Inductively Coupled Plasma Spectroscopy (ICP)
This is an analytical technique used to detect trace metals. It requires the elements to be in solution before analysis can be done. This method is able to identify and quantify all elements except Argon. It utilizes a plasma as the atomization and excitation source. It is based on the measurement of wavelengths and intensities of spectral lines emitted by secondary excitation. The analysis is compared to standard reference materials.
The accuracy for ICP method is 1 part per thousand for gold.