From: psonnenfeld**At_Symbol_Here**EARTHLINK.NET
Subject: Re: [DCHAS-L] Mercury in laboratory effluent
Date: Thu, 5 Mar 2015 21:34:15 -0800
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 6746731.1425620055677.JavaMail.root**At_Symbol_Here**

Have you evaluated using #6 Portland cement to solidify the effluent?  In the early 1990's the EPA research lab at the University of Cincinnati conducted numerous studies on stabilization and solidification of hexavalent chromium and mercury.  My recollection was the #6 cement was very effective.


-----Original Message-----
From: Ernie Lippert
Sent: Mar 5, 2015 7:55 AM
Subject: [DCHAS-L] Mercury in laboratory effluent

The ASTM method D1252-88, Standard Test Methods for Chemical Oxygen Demand
(Dichromate Oxygen Demand) of Water is used as the basis of determining the
COD for other materials, not just [waste] water. This procedure specifies
the use of 1 gm of mecuric sulfate per sample to minimize the effect of
chloride ions which may be present. The waste from such determinations
contains considerable mercury. There are likely to be other procedures in
which mercury is used. How do academic and commercial labs economically
handle such waste that consists mostly of water containing Hg and a few
other less regulated contaminants? I believe the current allowable level for
discharge is 1.0 ppb Hg.


Ernest Lippert

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