第1楼2004/10/25
岛津仪器的推荐条件:
火焰法:
Measuring conditions and Calibration curve
• Measuring conditions
Current ; 12 mA/0 mA ; 10 mA/600 mA Burner height ; 17 mm
Wave length ; 364.3 nm ; 364.3 nm Burner angle ; 0 deg
Slit width ; 0.5 nm ; 0.5 nm Fuel gas flow ; 7.8 l/min
Lighting mode ; BGC-D2 ; BGC-SR Type of oxidant ; N2O
• Calibration curve in BGCD2 mode
STD. CONC. ABS.
No. (ppm) 364.3nm
1 12.0000 0.0951
2 25.0000 0.1838
3 50.0000 0.3425
4 75.0000 0.4667
5 100.0000 0.5879
[ABS]=K2*[C]2+K1*[C]+K0
K0= 0.0000, K1= 0.0077, K2= –0.0000
Interference
If excessive hydrofluoric acid, F2 or Al coexists, sensitivity rises. Therefore, 0.1M ammonium fluoride is added to the standard or unknown sample.
0.1% potassium chloride is added to restrain ionization.
第2楼2004/10/25
• Lighting conditions
Current ; 12 mA/0 mA ; 10 mA/600 mA
Wavelength ; 364.3 nm ; 364.3 nm
Slit width ; 0.5 nm ; 0.5 nm
Lighting mode ; BGC-D2 ; BGC-SR
• Graphite furnace temperature program (High sensitivity mode 0. 0H), Pyrolytic graphite tube
STAGE# TEMP.(oC) TIME (sec) GAS (l/min) HEAT SAMPLING PreTIME
1 120 20 #1 1.0 RAMP OFF
2 250 10 #1 1.0 RAMP OFF
3 900 10 #1 1.0 STEP OFF
4 900 3 #1 0.0H STEP OFF
5 2600 3 #1 0.0H STEP ON 2
• Calibration curve in BGC-D2 mode (Sample injection volume 20 l)
STD. CONC. ABS.
No. (ppb) 364.3nm
1 0.0000 0.0074
2 40.0000 0.1208
3 120.0000 0.3642
4 200.0000 0.5803
[ABS]=K2*[C]2+K1*[C]+K0 r2=0.9997
K0= 0.0044, K1= 0.0031, K2= –0.0000