Element Cd Co Cr Cu Fe Mn Ni Pb Zn Lamp current (mA) 4 7 7 4 5 5 4 5 5 Fuel C2H2 C2H2 C2H2 C2H2 C2H2 C2H2 C2H2 C2H2 C2H2 Support air air air Air air Air air Air Air Wave length (nm) 228.8 240.7 357.9 324.7 248.3 275.9 232.0 217.0 213.9 Slit width (nm) 0.5 0.2 0.2 0.5 0.2 0.2 0.2 1.0 1.0 Instrument detection limit 0.002 0.005 0.006 0.003 0.006 0.002 0.010 0.010 0.001 Water (mg/l) 0.01 0.01 0.02 0.01 0.02 0.02 0.03 0.01 0.5 Soil (mg/kg) 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Vegetable (mg/kg) 0.01 0.01 0.02 0.01 0.02 0.02 0.03 0.02 0.05

Table 1: Instrument working condition and detection limits.