Cr, 1000 µg/mL in 5% HNO3, 100ml

Sulfide (S), 1000µg/mL in Tr. NaOH / Water, 3 x 20ml

CONOSTAN S-21 + AS+Co+Sb+Se, 300ppm in 75cSt oil, 200g

S @ 10000 µg/g (1.00 wt%) in #2 Diesel Fuel, 100ml