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C, S determination in flue ash samples

閱讀：2696 發(fā)布時間：2015-05-15

Suitable analyzers
n CS-800
n CS-2000 (induction furnace)
Used accessories
n Ceramic crucibles (90150)
n Tungsten (90220)
n Suitable calibration material (NIST or other)
Settings
n Comparator level: 10 mV
(low C, S Channel)
Comparator level: 20 mv
(High C, S Channel)
n Minimum time: 45 sec
n Maximum time: 1:00 min
n Integration delay: 6 sec
n Post-waiting: 10 sec
n Pre-purging: 15 sec
n Base line deviation: 5 mV
Base line time: 30 sec
n T1 - Pre-purging: 5 sec
n T2 - Chamber only: 5 sec
n T3 - Chamber and lance: 1 sec
n T4 - Generator: 40 sec
Sample preparation
For best results grind the sample down to a particle size of approx. 200 µm.
Dry the sample to constant mass at 105°C (at least 1 hour).
Pre-heating the crucibles (1 h; 1000°C) could improve the precision.
Procedure
n Prepare ELTRA analyzer (e.g. exchange anhydrone, sodium hydoxide,
copper oxide when necessary); clean the combustion tube, brush, heating
shield, dust trap
n Run three warm up samples (e.g. steel samples (92400-3050) with a
minimum weight of 500 mg; add 1.5 g tungsten)
n Calibrate the analyzer with suitable calibration material (NIST or other)
(1) Weigh in approx. 500 mg of sample in the ceramic crucibles (90150)
(2) Add 0.7 (±0.1) g of iron accelerator (90260) and 2.0 (±0.1) g of
tungsten (90220)
(3) Place the crucible on the pedestal and start analysis
Repeat step (1) - (3) at least three times;
Mark the results and use the calibration function in the software.

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C, S determination in flue ash samples

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