EPA Method 548.1 Internal Standard

2,4,6-Tris(2,4,6-Tribromophenoxy-1,3,5-triazine,50 µg/mL ,toluene,1mL,

Sulfur Calibration Mixtures: Di-n-butyl sulfide in Light White Oil (less than 20mg/kg S) Unit : 10mL screw-capped bottle Light White Mineral Oil Heavy White Mineral Oil (20 cSt at 40°C) (70 cSt at 40°C)

L-Tryptophan, 100mg