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How to dilute Acephate? Walter R. 05-02-2008
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Posted by Walter R. on May 2, 2008, 7:01 pm
Various mites and bugs are destroying my junipers and Italian cypresses, big
time. I would like to spray them with Acephate (Orthene). The HD sells it in
small bottles at outrageous prices ("Systemic Insect Killer" by Ortho). It
comes in a 8% solution.

On the web I can buy 98% Acephate powder by the pound for only a few
dollars.

How much water would I use to dilute one pund or one ounce of the powdered
98% acephate (sold by
weight) so that I would get an 8% or 10% solution?

Thank you


--
Walter
www.rationality.net
-



Posted by Boden on May 2, 2008, 11:55 pm
Walter R. wrote:

> Various mites and bugs are destroying my junipers and Italian cypresses, big
> time. I would like to spray them with Acephate (Orthene). The HD sells it in
> small bottles at outrageous prices ("Systemic Insect Killer" by Ortho). It
> comes in a 8% solution.
>
> On the web I can buy 98% Acephate powder by the pound for only a few
> dollars.
>
> How much water would I use to dilute one pund or one ounce of the powdered
> 98% acephate (sold by
> weight) so that I would get an 8% or 10% solution?
>
> Thank you
>
>
The MSDS that I found for Orthene showed 9.4% by weight of acephate
dissolved in a solvent other than water. Note that the density of
Orthene is specified to be 6.9 lb/gal and it's 'miscible', not soluble
in water. This makes me believe that the acephate is dissolved in an
undisclosed organic solvent at a ratio of 9.4 grams of acephate in 90.6
grams of solvent to yield a 9.4% w/w solution. To measure out 9.4 grams
of acephate accurately use a laboratory balance.

The resulting solution can then be mixed with water to get the solution
to be applied.

http://www2.itap.purdue.edu/msds/docs/8940.pdf

If you're not comfortable selecting an appropriate solvent and weighing
the components, I'd recommend buying the more expensive Orthene.

Posted by Don Klipstein on May 3, 2008, 2:25 am
> <SNIP writing of Walter R. to edit for space>
>
>The MSDS that I found for Orthene showed 9.4% by weight of acephate
>dissolved in a solvent other than water. Note that the density of
>Orthene is specified to be 6.9 lb/gal and it's 'miscible', not soluble
>in water.

Please keep in mind that "miscible" means soluble in any ratio. As in
99%-"A", 1%-"B" or the other way around or anywhere in between.

This "miscibility" may depend on Orthene being 9.4% acephate, 90.6%
solvent or solvent mixture that is miscible with water.

Solvents lighter than water and miscible with water will probably be
lighter alcohols, maybe acetone or MEK, or similar.

> This makes me believe that the acephate is dissolved in an
>undisclosed organic solvent at a ratio of 9.4 grams of acephate in 90.6
>grams of solvent to yield a 9.4% w/w solution. To measure out 9.4 grams
> of acephate accurately use a laboratory balance.
>
>The resulting solution can then be mixed with water to get the solution
>to be applied.
>
>http://www2.itap.purdue.edu/msds/docs/8940.pdf
>
>If you're not comfortable selecting an appropriate solvent and weighing
>the components, I'd recommend buying the more expensive Orthene.

- Don Klipstein (don@misty.com)

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