 The 8 hour time weighted average ( TWA ) is set at 0 @.@ 5 mg / m3 by the American Conference of <unk> Industrial <unk> and by the Occupational Safety and Health Administration ( <unk> ) as a legal permissible exposure limit ( <unk> ) in the workplace . The National Institute for Occupational Safety and Health ( <unk> ) has set a recommended exposure limit ( <unk> ) of 0 @.@ 5 mg / m3 as an 8 hour TWA . Antimony compounds are used as <unk> for <unk> <unk> ( <unk> ) production . Some studies report minor antimony <unk> from <unk> bottles into liquids , but levels are below drinking water guidelines . Antimony concentrations in fruit juice concentrates were somewhat higher ( up to 44 @.@ 7 µg / L of antimony ) , but <unk> do not fall under the drinking water regulations . The drinking water guidelines are : 
