As @ 1000 µg/mL in 5% HNO3, 100ml

Fluoride (F-), 1.0µg/mL in Water, 500ml

Fluoride (F-), 10µg/mL in Water, 500ml

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