From: ALFRED BARKSDALE <adkb**At_Symbol_Here**COMCAST.NET>
Subject: Re: [DCHAS-L] Old Bleach
Date: Fri, 29 Oct 2021 01:05:06 -0500
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: 1846290783.1040315.1635487506061**At_Symbol_Here**

For sanitizing surfaces [vs sterilizing] the "old" bleach should be ok.  The commercial bleach solutions contain a "stabilizer" that to some degree preserves the hypochlorite. If one looks into the "ancient" literature, dilution of commercial 5.25% sodium hypochlorite by1 to 10 or more to swab down showers and bathroom areas was common. 
On 10/25/2021 3:43 PM Patricia Leach <patricia.leach**At_Symbol_Here**> wrote:


I was wondering about using old stocks of bleach for disinfecting in bio labs. The bleach is about 2 years old and has never been opened. I am not sure if it is industrial or commercially available bleach. Any advice would be appreciated.

Patricia Leach

Environmental Health and Safety Coordinator

Emergency Management and Safety

Texas A&M University - Commerce

P: 903.468.3278

C: 316.644.8255


Mail: P.O. Box 3011, Commerce, TX 75429


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