TECHNIQUE: ION CHROMATOGRAPHY,
CONDUCTIVITY
ANALYTE: sulfate ion
DESORPTION: 2 mL 0.2 M NH4OH + 5 mL
30% H2O2
INJECTION VOLUME: 50 µL
ELUENT: 40 mM NaOH, 1.5 mL/min
COLUMN: Ion-Pac AS4A separator, AG4A
guard
CALIBRATION: SO4
2-
in deionized water
RANGE: 17 to 200 µg per sample
ESTIMATED LOD: 11 µg per sample
PRECISION (Sr
): 0.031