Gastric acid
The highest concentration that gastric acid reaches in the stomach is 160 mM in the canaliculi. This is about 3 million times that of arterial blood, but almost exactly isotonic with other bodily fluids. The lowest pH of the secreted acid is 0.8, but the acid is diluted in the stomach lumen to a pH between 1 and 3.
Oneida Number Three Tunnel
The pH of the water being discharged from the Oneida Number Three Tunnel ranges from 3.9 to 4.7. The average pH of the waters is 4.53. The concentration of acidity in the tunnel's waters is 17.35 milligrams per liter and the daily load of acidity is . The acidity load requires an 89 percent reduction to meet its total maximum daily load requirements. The alkalinity concentration of its waters is 7.40 milligrams per liter and the load of alkalinity is per day. The net concentration of acidity is 15.8 milligrams per liter.