 The 8 hour time weighted average ( TWA ) is set at 0 @.@ 5 mg / m3 by the American Conference of Governmental Industrial Hygienists and by the Occupational Safety and Health Administration ( OSHA ) as a legal permissible exposure limit ( PEL ) in the workplace . The National Institute for Occupational Safety and Health ( NIOSH ) has set a recommended exposure limit ( REL ) of 0 @.@ 5 mg / m3 as an 8 hour TWA . Antimony compounds are used as catalysts for polyethylene terephthalate ( PET ) production . Some studies report minor antimony leaching from PET 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 juices do not fall under the drinking water regulations . The drinking water guidelines are : 
 The 8 hour time weighted average ( TWA ) is set at 0 @.@ 5 mg / m3 by the American Conference of Governmental Industrial Hygienists and by the Occupational Safety and Health Administration ( OSHA ) as a legal permissible exposure limit ( PEL ) in the workplace . The National Institute for Occupational Safety and Health ( NIOSH ) <a href='been_done' title='1'><mark>has</mark></a> set a recommended exposure limit ( REL ) of 0 @.@ 5 mg / m3 as an 8 hour TWA . Antimony compounds are used as catalysts for polyethylene terephthalate ( PET ) production . Some studies report minor antimony leaching from PET bottles into liquids , but levels are below drinking water guidelines . Antimony concentrations in fruit juice concentrates<a href='been_done' title='2'><mark></mark></a> <a href='uninflect' title='3'><mark>were</mark></a> somewhat higher ( up to 44 @.@ 7 µg / L of antimony ) , but juices do not fall under <a href='None' title='4'><mark>the</mark></a>drinking water <a href='negative_concord' title='5'><mark>regulations</mark></a> . The drinking water guidelines are : 
Da 8 hour time weighted average ( TWA ) is set at 0 @.@ 5 mg / m3 by tdaAmerican Conference of Governmental Industrial Hygienists and by the Occupational Safety and Health Administration ( OSHA ) as a legal permissible exposure limit ( PEL ) in the workplace . Thdaational Institute for Occupational Safety and Health ( NIOSH ) done set a recommended exposure limit ( REL ) of 0 @.@ 5 mg / m3 as an 8 hour TWA . Antimony compounds are used as catalysts fir polyethylene terephthalate ( PET ) production . Some studies report minor antimony leaching from PET bottles into liquids , but levels are below drinking water guidelines . Antimony concentrations in fruit juice concentrates been was somewhat higher ( up to 44 @.@ 7 µg / L of antimony ) , but juices do not fall under drinking water no regulations . Thedainkin water guidelines are :