Ammonia as (NH4+)

S @ 1000 µg/g (0.100 wt%) in #2 Diesel Fuel, 100ml

Mercury (Hg), 1µg/ml in 2%-HNO3 / Water, 3 x 20ml

Cyanide (CN-)@1000mg/L in 0.1% NaOH, 100ml