Phosphate (PO4-3) as P, 1000µg/ml in Water, 500ml

Total Cyanide (CN-), 100µg/ml in in H2O/NaOH,100ml

Si @ 10000 µg/mL in H2O, tr. F-, 100ml

S @ 10000 µg/mL in H2O, 100ml