The Environment Agency of England and Wales is involved in independent monitoring programs for various industrial processes where permits require measurement of hydrogen chloride (HCl) in stack gas releases. These programs have discovered a number of difficulties associated with currently used HCl monitoring techniques. In addition, significant differences have been observed between results obtained using manual methods and those obtained using CEMS, according to Maciek Lewandowski at CEM 2001. Therefore, the Agency commissioned a project to compare and assess various measurement techniques under controlled and repeatable laboratory conditions. The work was performed by the U.K.'s National Physical Laboratory (NPL) and consisted of a series of tests involving CEMS and Standard Reference Methods (SRMs) using a special test chamber. Click Here For Complete Article Text
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