solutions containing sodium nitrite and non-absorbable volume marker ( polyethylene glycol , peg ) were infused into the stomach , and samples were taken over 60 min to determine the concentration of 'total nitrite ' ( including no2- , hno2 and other species in equilibrium with no2- ) and rate of dilution of the stomach contents as a function of time .
C0037532
sodium
C0028137
nitrite