domingo, 4 de mayo de 2008

QUATERNARIES VS PHENOLICS AS DISINFECTANTS

QUATERNARIES

  1. Readily combine with non-ionic surfactants, making excellent cleaners since they are great detergents them self.
  2. They are water soluble.
  3. Work best at pH round 10, which is best for soap detergency.
  4. They provide high foam but also fast rinsing.
  5. Relatively safe to use, some are approved for use as topical and as no rinse sanitizers in food handling areas.

PHENOLICS

  1. Are inactivated by non-ionic surfactants, must be combined with anionic surfactants to formulate cleaners; these have lower cleaning power than non ionics .
  2. Do not solubilize in water, detergents are needed to suspend them in water, or alcohols to solubilize them.
  3. Maximal biocidal activity is achieved at pH of 6 to 7, when detergency is poor.
  4. Poor rinsing properties and residues left by anionic soaps makes inappropriate for floor cleaning.
  5. They have questioned safety for skin contact.
  6. They have greater residuality than quaternaries.

Publicado por EMILIO MALAGUTI en 17:52

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GREEN CHEMICALS

The Green Seal certification is granted by the organization with that name and has a great number of members contributing with the requirements to pass a raw material or a chemical product as "green". Generally for a material to be green, has to comply with a series of characteristics like: near neutral pH, low volatility, non combustible, non toxic to aquatic life, be biodegradable as measured by oxygen demand in accordance with the OECD definition.
Also the materials have to meet with toxicity and health requirements regarding inhalation, dermal and eye contact. There is also a specific list of materials that are prohibited or restricted from formulations, like ozone-depleting compounds and alkylphenol ethoxylates amongst others. Please go to http://www.greenseal.com/ for complete information on their requirements.
For information on current issues regarding green chemicals, see the blog from the Journalist Doris De Guzman, in the ICIS at: http://www.icis.com/blogs/green-chemicals/.
Certification is an important — and confusing — aspect of green cleaning. Third-party certification is available for products that meet standards set by Green Seal, EcoLogo, Energy Star, the Carpet & Rug Institute and others.
Manufacturers can also hire independent labs to determine whether a product is environmentally preferable and then place the manufacturer’s own eco-logo on the product; this is called self-certification. Finally, some manufacturers label a product with words like “sustainable,” “green,” or “earth friendly” without any third-party verification.
“The fact that there is not a single authoritative standard to go by adds to the confusion,” says Steven L. Mack M.Ed., director of buildings and grounds service for Ohio University, Athens, Ohio.
In www.happi.com of June 2008 edition, there is a report of Natural formulating markets that also emphasises the fact that registration of "green formulas" is very confused at present, due to lack of direction and unification of criteria and that some governmental instittion (in my opinion the EPA) should take part in this very important issue.