Merit of non-suppressed method.
Since the use of a suppressor is unnecessary, the system is simple and inexpensive.
Demerits of non-suppressed method.
1. Background conductivity is rather high.
(anion analysis: 200 to 250 micro-S/cmFS, cation analysis: 1,000 to 2,500 micro-S/cmFS)
2. Sensitivity is rather low. Detection sensitivity is about tens ppb and minimum sample concentration is about hundreds ppb.
3. The usable eluent is limited to low-conductivity solvents such as phthalic acid.