In the spectrophotometric estimation of sulfur dioxide with hydrochloric acidbleached pararosaniline hydrochloride and formaldehyde, interference due to oxides of nitrogen has been eliminated without complication of the original procedure of West and Gaeke (5). Addition of 0.06% sulfamic acid to 0.1 M sodium tetrachloromercurate(ll) used as absorbing solution for sulfur dioxide from the atmosphere immediately destroys any nitrogen dioxide present.
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