Determination of chlorine, bromine and sulfur by gasphase molecular absorption spectrometry

摘要

This work describes the recent development of molecular absorption spectrometry for the determination of non-metallic elements chlorine, bromine, and sulfur that are difficult to study by the conventional atomic absorption sepctrometry because their resonance lines lie in the vacuum ultraviolet region. The determination of chlorine and bromine is based on the formation of diatomic aluminium chloride and bromide molecules, with lead and arsenic hollow cathode lamps as irradiation sources, respectively. Sulfur can be determined as sulfur dioxide using an arsenic hollow athode lamp and as indium, aluminium, and tin sulfides using iron, platinum or wolfram hollow cathode lamps. Sulfides can also be determined as hydrogen sulfide using a selenium hollow cathode lamp as the irradiation source. The background correction was performed in all measurements by a deuterium lamp background correction system. The method was tested for different organic and inorganic compounds. (author)