From: Allen Jones <arjones999**At_Symbol_Here**GMAIL.COM>
Subject: Re: [DCHAS-L] Weighing Solid Chemicals
Date: Wed, 6 May 2015 09:26:43 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: CANRqTd_tD2Lc4CykVwq+G4ME3YmU43ORtPzoJgUn9suii3rfqA**At_Symbol_Here**

Factors that you should consider when weighing solids include:

For example, we would move a top loading balance to a hood for weighing all materials that contain cyanide or hexavalent chromium. For larger quantities we would put a larger scale in a transfer hood. I would also put a label on the container stating that this compound should be only weighed in the hood. Preferably, when possible weigh the compound directly into the beaker that it will be used and add water if you are making an aqueous solution before removing it from the hood. This will prevent making dust during a secondary transfer to another container.

Best regards,

Allen Jones



On Tue, May 5, 2015 at 2:39 PM, Secretary, ACS Division of Chemical Health and Safety <secretary**At_Symbol_Here**> wrote:
From: "Butler, David H." <DHButler**At_Symbol_Here**>
Subject: Weighing Solid Chemicals
Date: May 5, 2015 at 2:25:02 PM EDT

Hi Guys,

I'm working on a corrective action to improve weighing solid chemicals in the lab. Can you help me identify MSDS criteria that would restrict weighing the chemical unless a balance enclosure (filtered) or hood is used and/or a listing.

Thank you for your time and help.

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