3.1.6.11 NaCl 0.16 M 50% inhibition 42 3.1.6.11 PO43- 0.2 mM 22% inhibition 867 3.1.6.11 SO32- 0.2 mM 97% inhibition 902 3.1.6.11 SO42- 0.2 mM 43% inhibition 245