Based on eluent autogeneration technology

ion chromatography determination of F-

CH3COO-

C2H5COO-

HCOO-

Cl-

NO2-

Br-

NO3-

SO42-

PO43-in natural water was established.Gradient elution was performed by using the IonPac AS17-C analytical column

and the KOH eluent was online generated by EG40.The flow rate was 1.0 mL/min

column temperature was 30 ℃

and the injection volume was 25μL.Results show that

the ion detection limits are distributed within 0.5～3.1 μg/L

and the relative standard deviation(RSD) is less than 0.92%;test recovery rate for actual natural water sample is from 95.2% to101.8%.Because it is sensitive

fast and accurate

this gradient elution method applies to simultaneous determination of multiple anions in natural water.