S. Motomizu et al., ELECTRICAL-CONDUCTIVITY DETECTION ION CHR OMATOGRAPHY USING A SUPPRESSOR METHOD BASED ON ION ASSOCIATION MICELLE EXTRACTION, Bunseki Kagaku, 44(12), 1995, pp. 1041-1048
A novel background suppressor method in conductivity detection/ion chr
omatography for inorganic anions was developed. The eluent used was a
dodecyltrimethylammonium hydroxide (C12H25-TMA(+)OH(-)) solution; a do
decylbenzenesulfonic acid (H . DBS) solution was used to suppress the
background conductivity. The eluate was mixed with the suppressor solu
tion and the ion associate formed was extracted into the micelle of no
nionic surfactant (polyoxyethylene (10) octylphenyl ether, Triton X-10
0) as a mixed micelle. The background conductivity was decreased to 24
mu S cm(-1) by the acid-base neutralization and micelle extraction. F
or rapid analysis, a carbonate buffer solution (pH 10.8) was used: the
solution was prepared by bubbling CO2 into the hydroxide eluent. The
elution of sulfate ion with the carbonate buffer was accomplished with
in 20 min. Chloride, nitrate and sulfate ions in river and tap waters
were determined satisfactorily with 1.5X10(-3) MC(12)H(25)-TMA(+)OH(-)
and CO2 (pH 10.8) as the eluent, and 1.5X10(-3) M H . DBS and 4% (w/w
) TX-100 as the suppressor solution by injecting 50 mu l of sample sol
ution.