Metrohm 794 Basic Titrino - Manual (Page 174)

6.3. User methods
794 Basic Titrino
170
6.3.6 "Diazo"
Diazotation of sulfonamides and primary
amines.
Electrode:
6.0341.100 Pt-Titrode, at measuring input 1
Titrant:
c(NaNO
2
) = 0.1 mol/L.
Solvent:
w(HBr) = 0.3 (30%)
Sample:
Dilute 0.2 – 0.5 mmol of the substance to be
determined in 30 mL solvent and add 20 mL
dist. water. Titrate immediately.
– Sample size in g
– Molar mass of the substance to be determined
– Normality of the titrant (0.1*titer)
– Factor for %
'pa
794 Titrino 01102 794.0010
date 2002-01-03 time 09:43 0
MET U Diazo
parameters
>titration parameters
V step 0.10 ml
titr.rate max. ml/min
signal drift OFF mV/min
equilibr.time 20 s
start V: abs.
start V 0.5 ml
dos.rate max. ml/min
pause 80 s
meas.input: 1
temperature 25.0 °C
>stop conditions
stop V: abs.
stop V 6.00 ml
stop U OFF mV
stop EP 9
filling rate max. ml/min
>statistics
status: OFF
>evaluation
EPC 30 mV
EP recognition: greatest
fix EP1 at U OFF mV
pK/HNP: OFF
>preselections
req.ident: OFF
req.smpl size: value
activate pulse: OFF
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'fm
794 Titrino 01102 794.0010
date 2002-01-03 time 09:43 0
MET U Diazo
>calculations
Content=EP1*C01*C02*C03/C00;2;%
C00= 1.0
C01= 1
C02= 1
C03= 0.1
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