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MANUAL DE INSTRUCCIONES CODIGO 80188 REV E
J
.P. SELECTA s.a.u.
Jun/2018
7 Reagents
The reagents to be used must be free of ammonia.
7.1 Prepared reagents
The best thing is to use reagents factory prepared, mainly the HCl for titration. Any
error on its preparation have a direct influence on the result.
As an example the following reagents could be used, or the equivalent one in other
brands:
Boric acid 4%
(For ammonia titration)
Mixed indicator 5 RV
(Red of metile + Green Bromocresol)
Mixed indicator RV
(Red of metile + Blue of metilene)
HCl 0.1N SV
HCl 0.25N
H
SO
0.1N
2
4
H
SO
0.2N
2
4
Acetanilide 99% (Validation standard)
Ammonia sulphate (Validation standard)
Kjeldahl Catalyst 6.25% Cu tabl. 8g
7.2 Proper reagents set up
As it is usual on most laboratories, the reagents to work with PRO-NITRO «S»
could be prepared starting from concentrated ones.
The NaOH 40%, acid Boric 4% are not critical on the concentration and it is not
necessary to work with precision.
Reagents for titration (HCl or H
be accurate. Any error on its preparation has a direct influence on the result.
Autovía A-2 Km 585.1 Abrera 08630 (Barcelona) España
e-mail: [email protected] - website: http://www.jpselecta.es
(Sujetas a modificaciones sin previo aviso)
RV
SV
SV
SV
SO
) must be high precision and calculation must
2
4
PANREAC 282222
PANREAC 283303
PANREAC 282430
PANREAC 171023
PANREAC 182318
PANREAC 181061
PANREAC 182011
PANREAC 151005
PANREAC 131140
PANREAC 174428
Tel 34 937 700 877 Fax 34 937 702 362
Pag.: 43
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