Ni @ 1000 µg/mL in 5% HNO3, 100ml

Nitrate (NO3-) as N, 1000µg/mL in Water, 100ml

Nitrite (NO2-) as N, 1000µg/ml in Water, 100ml

Na, 1000 µg/mL in 5% HNO3, 100ml