to assess the relative bronchoconstricting potencies of these chemical forms and the role of acidity caused by the release of hydrogen ions in so2- and sulfite-induced bronchoconstriction , we administered to 10 asthmatic subjects nebulized sodium sulfite ( na2so3 ) solutions at ph 9 containing 95 % sulfite , at ph 6.6 containing 80 % bisulfite , and at ph 4 containing 99 % bisulfite but greater than an order of magnitude more so2 than the ph 6.6 solutions .
C0074771
sodium
C0038750
sulfite