I recently read that chlorine dioxide was used to remediate mold in a building. Why is it that this process is not mentioned the S520 Mold Remediation Standard?
A: Chlorine dioxide is a biocide that can be used as a gas or as a liquid. In the past, it was created by mixing either sodium chlorite or stabilized chlorine dioxide with another "reactive" chemical, generally an acid such as citric or lactic acid. According to one source, chlorine dioxide is generated for smaller applications by the reaction of sodium chlorite with chlorine, either through gaseous chlorination or the reaction of sodium hypochlorite with hydrochloric acid. The result is chlorine dioxide in a liquid or gas that smells like chlorine bleach.