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Ammonia as Nitrogen. ALS Environmental may or may not test for Ammonia as Nitrogen (CAS # 7664-41-7). Information is subject to change; please contact us for the latest available analytes for which we test.
This rule was remanded by the U.S. Circuit Court of Appeals and the limits are not currently in force. CAS: 7664-41-7; Chemical Formula: NH3. OSHA's former exposure limit for ammonia was 50 ppm as an 8-hour TWA.