J.P. SELECTA DOSI-FIBER 4 PLAZAS Manual De Instrucciones página 32

MANUAL DE INSTRUCCIONES CODIGO 80055 REV D OCT2018
J
.P. SELECTA s.a.u.
Procedure:
1- Weight and transfer ( precision ±0.1mg) of 1 to 1.5 mg sample
into a porous crucible. The quantity of sample is W
2- Place the crucible into the Dosi-fiber unit.
3- Ensure that the valves are in «OFF» position.
4- Add 100 ml of neutral detergent solution (N.D.S.) to each column.
5- Open the cooling circuit and turn on the heating elements (power
at 90%)
6- Wait until it boils, reduce the power by 30% and leave boiling dur-
ing the extraction time (60 min.).
7. To stop heat. Open the vacuum circuit and place the valves in
«ABSORPTION» . Fill with distilled water with the spray in each
column. Repeat this process 3 times.
Cold extraction with Acetone.
Do not make the cold extraction with acetone in the Dosi-fiber
equipment
8- Prepare the «Kitasatos» flask with the vacuum pump. Place the
crucible in the Kitasatos inlet and add acetone at the same time
that the vacuum circuit is absorbing toward the flask (like in the 1
and 2 methods). Repeat it 2 times.
9- Put the samples to dry in an oven at 150ºC during 1 hour.
10- Leave them to cool inside the vacuum dryer.
11- Weight the samples with a precision of ±0.1 mg. The weighted
quantity is W
12- Ash crucible samples in a muffle furnace at 500ºC during a mini-
mum of 3 hours.
13- Leave them inside the vacuum dryer to cool. Take note of the
recommendations given for the crucible handling.
14- Weight the crucibles with a precision of ±0.1 mg. The quantity
weighted is W
15- Carry out the following calculation:
% F.N.D. =
Ctra. NII Km 585.1 Abrera 08630 (Barcelona) España
e-mail: jpselecta@sefes.es - http://www.sefes.es/selecta
(Sujetas a modificaciones sin previo aviso)
3.
4.
W - W
1 2
x 100
W
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Pag.: 32
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