1 Boron standard Solution Traceable to SRM from NIST (H2BO3 in water) 1000 mg/l 2 Ammonia standard solution traceable to SRM from NIST NHCl in H2O 1000 mg/l NH 3 Nickel standard solution as Ni(NO3)2 in HNO3 0.5 mol/L of 1000 mg/L for AAS SRM Tracea