EPA Method 8081A Mix #2

2,4'-DDE, 100 µg/ml, Methanol, 1ml

2,3,6,7-Tetrachloroxanthene , 1.2ml x 50ug/ml, toluene

2,4,6,8-Tetramethyl-2,4,6,8-tetraazabicyclo[3.3.0]-3,7-oxandione