Effects of pH on IMIDAN Half Life pH Half Life 5.0 178 hours 5.5 92 hours 6.0 36 hours 6.5 14 hours 7.0 neutral 10 hours 7.5 2 hours 8.2 33 minutes Effects of pH on IMIDAN Half Life pH Half Life 5.0 178 hours 5.5 92 hours 6.0 36 hours 6.5 14 hours 7.0 neutral 10 hours 7.5 2 hours 8.2 33 minutes