Design of a new flame-containing molecular emission cavity for speciation of sulfide, sulfite, sulfate, thiosulfate and thiocyanate in wastewater: catalytic behaviour of hydrogen ion

A new flame-containing molecular emission cavity analysis (MECA) system was designed for the speciation of S2−, SO32−, SO42−, SCN−, and S2O32− in wastewater based on the catalytic properties of H+. For speciation of sulfur, SO32− and S2O32− were detected via the formation of SO2 during direct introduction to an air-bubbling Cu(II)/HNO3 and Al(III)/OH− solutions, respectively. Total quantity of SO32−, S2−, SO42−, and SCN− was also determined via...