RE: [Histonet] RDO decal

From:"Tony Henwood"

There is also the issue of EDTA, which is common in many RDO formulations.
Checking one MSDS for EDTA reveals:

Ecological Information
  Environmental Fate: 
  When released into the soil, this material is expected to leach into 
  groundwater. When released into the soil, this material may biodegrade to a 
  moderate extent. When released into the soil, this material is not expected to 
  evaporate significantly. When released into water, this material is not 
  expected to evaporate significantly. This material is not expected to 
  significantly bioaccumulate. When released into the air, this material is=20
  expected to be readily degraded by photolysis. 
  Environmental Toxicity: 
  This material is not expected to be toxic to aquatic life. The LC50/96-hour 
  values for fish are over 100 mg/l. 

So neutralisation may not be required.
If anyone has info to the contrary please advise.


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-----
From: [] On Behalf Of Rene J Buesa
Sent: Thursday, 6 September 2007 1:07 AM
Subject: Re: [Histonet] RDO decal

  I have not heard of neutralizing RDO, but it would make sense if you want to be "gentle on your sewer system" BUT prepare to a large emission of carbon dioxide when attempting to neutralize it with baking soda.
  RDO + baking soda (or sodium bicarbonate) will produce water, salt with the acid in RDO (probably sodium chloride or common salt), and carbon dioxide in stoichiometrical amounts (1 CO2 per every 1 NaCl).
  Therefore that neutralization has to take place in a fumes hood, and you will have to decide which is worst: delivering acid to the sewer system, or carbon dioxide (the Greenhouse gas per excellence) to the atmosphere.
  It will be "your call".
  René J.

  Has anyone heard of neutralizing RDO with baking soda to P.H. 7.0. Our Histo lab had a hazardous waste assessment, and the consultant suggested we not throw the RDO down the drain but that we either collect it for waste removal or neutralize it with baking soda to p.h. 7.0. I have not heard of doing this and do not know of any procedure for it, everyone, anyone's help will be greatly appreciated.



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