According to the CDC, a concentration of 3% hydrogen peroxide can inactivate rhinovirus — the respiratory virus that primarily causes the common cold — within eight minutes. In addition, a 2018 study found that hydrogen peroxide was more effective in killing some forms of bacteria than the quaternary ammonium compounds found in many household cleaning products.

The typical 3% hydrogen peroxide concentration found in stores can be used as a disinfectant, or you can dilute it to a 0.5% concentration, which still has some effectiveness, using a mixture of 2.5 parts water and 0.5 parts 3% hydrogen peroxide.

Before disinfecting any surface with hydrogen peroxide, the CDC recommends using soap and water to clean the area. Once you've done so, you can pour or spray hydrogen peroxide on the surface and wipe with a paper towel or sponge.

After you've used hydrogen peroxide, make sure to leave it on the surface for at least one minute before drying to give it enough time to kill pathogens.

Chemical Disinfectants information - CDC -

Guideline for Disinfection and Sterilization in Healthcare Facilities (2008)

https://www.cdc.gov/infectioncontrol/guidelines/disinfection/disinfection-methods/chemical.html

Dr. Ken

Kenneth R. Roy, Ph.D.

Chief Safety Compliance Adviser

National Science Teaching Association (NSTA);

Safety Compliance Officer

National Science Education Leadership Association (NSELA);

Safety Committee Member

International Council of Associations for Science Education (ICASE);

Director of Environmental Health & Chemical Safety,

Glastonbury Public Schools (CT);

Safesci**At_Symbol_Here**sbcglobal.net

On Monday, June 22, 2020, 10:33:28 AM EDT, Jarral Ryter <jryter**At_Symbol_Here**western.edu> wrote:

Thanks for that article.

Any comments on cleaning chemicals? I was looking at products and active ingredients. The amount we will be expected to use in a class/lab setting will expose people to large amounts of the chemical repeatedly. Cost is also a factor.

I am looking for the best chemical that could be purchased cheaply, in bulk and would not cause harm (asthma etc) to users. The air in rooms would have to have a lot of chemical residue in them. Even well ventilated ones.

My top choice is 0.5%hydrogen peroxide.

Bleach diluted dailey is second in well ventilated labs.

Thoughts?

Thanks,

Jarral Ryter

Western colorado university

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------

From: DCHAS Membership Chair <membership**At_Symbol_Here**DCHAS.ORG>

Date: 6/22/20 6:41 AM (GMT-07:00)

To: DCHAS-L**At_Symbol_Here**Princeton.EDU

Subject: [DCHAS-L] National Science Teaching Association safety blog: “Safety Recommendations for Opening the New School Year"

NOTICE: This email originated from outside of the University. Do not click links or open attachments unless you recognize the sender and know the content is safe. Thank you, Western IT Services.

From: Ken Roy <safersci**At_Symbol_Here**gmail.com>

Subject: “Safety Recommendations for Opening the New School Year"

Date: June 20, 2020 at 10:45:41 AM GMT-4

This is the second commentary relative to addressing the COVID issues in K-12 schools titled “Safety Recommendations for Opening the New School Year." It was just published last night by NSTA.... Check out the NSTA July Safety Blog Commentary by Dr. Ken. Contains critical information that science and STEM teachers and supervisors/administrators need to address in planning use of lab this coming new school year:

https://www.nsta.org/blog/safety-recommendations-opening-new-school-year

You and family stay safer!!!

Ken

Kenneth R. Roy, Ph.D.

General Manager and Senior Safety Consultant

National Safety Consultants, LLC;

Director of Environmental Health & Chemical Safety,

Chemical Hygiene Officer;

Designated Asbestos Compliance Coordinator,

PCB Program Coordinator,

Silica Compliance Coordinator,

Glastonbury Public Schools (CT);

Chief Science Safety Compliance Adviser/Chief Safety Blogger

National Science Teaching Association (NSTA);

Safety Compliance Officer

National Science Education Leadership Association (NSELA);

Email: Safesci**At_Symbol_Here**sbcglobal.net

Cell: 860-816-4204

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