Sulfamethazine, 100 µg/ml, Methanol, 1ml

Azoxystrobin (free acid), 10.0 µg/ml, Acetonitril

2,3,7,8-Tetrachloro[13C12]dibenzofuran, 1.2ml x 50ug/ml, toluene

Nitrite (NO2-) as N