Figure 2.
Stability over (a) 1 h, (b) 10 h, and (c) 20 h in 10−4 M KCl at 23 °C for 1. QB (PVC), 2. QB (PU), 3. RKCl, 4. PVA, 5. UF, 6. Sureflow, 7. REFEX, 8. Orion Ross Ultra.
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