Indirect Determination of Sulfate by Atomic Absorption Spectrophotometry

Abstract

With a flow injection technique, the content of sulfate in solution was determined indirectly from the concentration of partially equilibrated barium ion in solution. To obtain improved sensitivity, atomic absorption spectrophotometry of a flame was used to determine barium. With these procedures combined with a linear calibration graph, superior sensitivity and detection limit of sulfate determination were obtained compared with those from other indirect methods.

An Optical Fiber Sensor Based on Fluorescence Lifetime for the Determination of Sulfate Ions

“…Raman spectroscopy has also been reported for the determination of sulfate ions dissolved in pore water of sediments [ 10 ], and it realized the diurnal variability change monitoring of the SO 4 2− intensity of offshore seawater [ 11 ]. Other techniques have been adopted to determine sulfate concentration, such as titration [ 12 , 13 ], atomic absorption spectroscopy (AAS) [ 14 , 15 ], ion chromatography (IC) [ 16 , 17 ], spectrophotometry [ 18 ], atomic fluorescence spectroscopy (AFS) [ 19 ], and inductively coupled plasma atomic emission spectroscopy (ICP-AES) [ 20 , 21 ]. Optical fiber sensors have many advantages compared with those detection methods: energy savings, high sensitivity, strong resistance to electromagnetic interference, enabling continuous remote monitoring, compactness, flexible shape, and real-time detection capability [ 22 , 23 , 24 , 25 ].…”