A capillary ion chromatography method was proposed

which can detect trace inorganic anions(F-

Cl-

SO2-4

Br-

NO-3

NO-2

PO3-4)and low-molecular-weight organic acids(CH3COO-

HCOO-

C2O2-4)in water and steam from boilers in power plants.The separation was achieved on IonPac AS18(250mm×0.4mm)capillary anions analytical column with optimized KOH gradient elution and 10μL injection at 0.010mL/min

and then each component's concentration was detected by suppressed conductivity.The results show that

under the chosen condition

the linear correlation coefficients of the above 10 anions were greater than 99.9%

the detection of limit with signal-to-noise ratio of 3were between 0.04μg/L and 0.8μg/L.After running for 96 hours

the relative standard deviations(RSDs)were still between0.03% and 5.81%

and the average recoveries ranged from 81%to 116%

indicating this method has better repeatability and accuracy.This detection method can be applied in numbers determination of trace anions and low-molecular-weight organic acids in water and steam of boilers in power plants.