AW: [Histonet] Formaldehyde concentration measurement

From:"Gudrun Lang"

We use 8% Formaldehyd.
What would be the right amounts of reagents to test this concentration?
Can you help?

Gudrun Lang

-----Ursprüngliche Nachricht-----
[] Im Auftrag von Tony
Gesendet: Freitag, 21. Oktober 2005 00:14
An: Maray Weirauch;
Betreff: RE: [Histonet] Formaldehyde concentration measurement

The following might be of use:

Test for validity of formalin concentrations


The Schiff's reagent (PAS stain) is used to detect aldehydes and In this
technique it is used to titrate a solution of formalin The 
concentration of
which is unknown.


1.	1 ml of formalin fixative to be tested.
2.	5 ml of 2.4% aqueous sodium bisulphite - prepare fresh.
3.	Schiffs reagent.


1.	Add 1 ml of formalin to 5 ml of sodium bisulphite.
2.	Mix and allow to react for 15 minutes at room temperature stirring
from time to time.
3.	Add 100µl of Schiff reagent.


If solution turns a deep violet than initial concentration of formalin 
is in
excess of 4% (i.e. 1.6% formaldehyde).


Jaspers, B., J. Histotechnol (1987) 10 (4): 263-265.


Tony Henwood JP, MSc, BAppSc, GradDipSysAnalys, CT(ASC)
Laboratory Manager & Senior Scientist
The Children's Hospital at Westmead,
Locked Bag 4001, Westmead, 2145, AUSTRALIA.
Tel: 612 9845 3306
Fax: 612 9845 3318

-----Original Message-----
[] On Behalf Of Maray
Sent: Friday, 21 October 2005 5:17 AM
Subject: [Histonet] Formaldehyde concentration measurement

Hi Histonetters,
Does anyone know of a simple, inexpensive way to measure the 
concentration in a prepared, buffered formalin fixative? Thanks!  Maray

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