Fe, 1000 µg/mL in 5% HNO3, 100ml

Zn, 1000 µg/mL in 5% HNO3, 100ml

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

Fluoride 0.1 µg/mL (F-) in Water, 500ml