Heavy metals Flame type Wavelength (nm) Slit width (nm) Cathode lamp current (mA) Acetylene flow (L/min) Air flow (L/min) Energy
Pb Air-acetylene 283.31 2.7/1.05 10 2.50 10 67
Cd – 228.80 2.7/1.35 4 – – 61
Cu – 324.75 2.7/0.8 15 – – 75
Co – 240.73 1.8/1.35 30 – – 72
Fe – 248.33 1.8/1.35 30 – – 65
Cr – 375.9 2.7/0.8 25 – – 92
Ni – 232.0 1.8/1.35 25 – – 60
Zn – 213.86 2.7/1.8 15 – – 53