Hello Marshall, Is is possible to weigh the anode before and after and get an idea of how much is in the solution?
Once again we are looking at very small measurements, but if you did several batches between weighing, you may get an agerage. The may be opptimistic, but could give a ballpark esimation. Tom ----- Original Message ----- From: "Marshall Dudley" <[email protected]> To: <[email protected]> Sent: Tuesday, February 23, 2010 8:58 AM Subject: Re: CS>Which layer of skin for silver deposit? > Doing quantitative analysis for silver compounds is really rather easy, > if you have much silver present. The biggest problem is that at 5-20 > ppm, the quantities are so small, that getting a good weight on them is > difficult. It can be done though with a good balance, forget a postage > scale. These pages might give you some ideas: > > http://dwb4.unl.edu/chemistry/smallscale/SS063c.html > http://dwb4.unl.edu/chemistry/picts/SS063All.gif > > Anyway, this can be done. > > Add a few drops of hydrochloric acid (muriatic acid should be ok) to the > mix. Verify that it becomes cloudy. Let the cloudy part settle, and > decant off the liquid. Dry the power and weight. Take the weight in > grams and divide by 1.33, that will give you the silver content of the > precipitant. Now divide that by the amount of water you had in liters > and multiply by 1,000,000. Add .6 ppm for the dissolved portion, and you > will now know the amount of ionic silver in ppm in the mixture. > > Now take the same amount of EIS and boil it dry. Add about 10 drops of > nitric acid (this must be done in a test tube) and reflux the sides > while boiling dry again over a flame (or use a flask over a hot plate). > You now have 100% silver nitrate. Weight this in grams and divide by > 1.575 and that will give you the total silver content. Divide that by > the amount of water in liters and multiply by 1,000,000 to get the ppm > of silver. > > Warning, nitric acid is very very toxic, breathing the fumes will > liquefy your lungs so boiling it must be done under a fume hood. Don't > even think of using a venta hood over a stove, it will completely eat > the metal of the hood and the metal piping to the outside up (if it even > goes outside). Fumes are not only toxic, but will destroy any > electronics you have in area. > > Another way to get the total silver would be to add the hydrochloric > acid as above, and boil it dry. Then subtract the amount you got in > grams in the first part. What remains will be the silver content of the > colloidal part. Divide this by the amount of water in liters and > multiply 1,000,000 for the colloidal part in ppm. > > PS, if you measure everything in micrograms instead of grams, you do not > have to multiply by 1,000,000 to get the ppm. > > Marshall -- The Silver List is a moderated forum for discussing Colloidal Silver. Rules and Instructions: http://www.silverlist.org Unsubscribe: <mailto:[email protected]?subject=unsubscribe> Archives: http://www.mail-archive.com/[email protected]/maillist.html Off-Topic discussions: <mailto:[email protected]> List Owner: Mike Devour <mailto:[email protected]>
