Sample : 5 μL
10 μg/L each for ClO₃^-, BrO₃^-
in Tap water containing sodium thiosulfate 0.3 w/v%
1. ClO₃^-, Chlorate
2. BrO₃^-, Bromate
3. S₂O₃^2-, Thiosulfate

Sample: 5 μL
Tap water containing
sodium thiosulfate 0.3 w/v%
1. ClO₃^-, Chlorate
2. BrO₃^-, Bromate
3. S₂O₃^2-, Thiosulfate

Column       : Shodex RSpak JJ-50 2D (2.0 mm I.D. x 150 mm)

Eluent       : (A); 200 mM HCOONH4 aq./(B); CH3CN

               Linear gradient (High pressure);

               85 % B (0 min) → 85 % B (8 min) → 50 % B (9 min) → 50 % B (20 min)

Flow rate    : 0.3 mL/min

Detector     : ESI-MS/MS (MRM Negative) for ClO3-, BrO3-

               ESI-MS (SIM Negative) for S2O32-

Column temp. : 50 ℃