[Histonet] Expiration dates of ammonium sulphide

[Tony Henwood (SCHN)]

Hi all,

I have a chemical question.

We use 20% ammonium sulphide and I am wondering whether it loses its efficiency over time. Is there an expiry date on this solution and is there a test one can do to determine the concentration of aged 20% solutions?

I have searched and come up with nuthin!

Regards 
Tony Henwood JP, MSc, BAppSc, GradDipSysAnalys, CT(ASC), FFSc(RCPA) 
Laboratory Manager & Senior Scientist 
Tel: 612 9845 3306 
Fax: 612 9845 3318 
the children's hospital at westmead
Cnr Hawkesbury Road and Hainsworth Street, Westmead
Locked Bag 4001, Westmead NSW 2145, AUSTRALIA 


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