As @ 1000 µg/mL in 5% HNO3, 100ml

Method 200.8/1638/1640 Internal Standard, 10µg/ml in 2%-HNO3, 4x25ml

Mn, 1000 µg/mL in 5% HNO3, 100ml

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