Hello Chip With use spectrophotometer, required glassware, and reagents you may anticipate about 6-700 $ (Special Drawing Rights, formerly known as metals certificates, then Federal Reserve Notes, and now SDRs. They no longer meet the legal definition of "note"; plus hours of study and prep. You will need to calibrate the Spec. against a precise dilution of ACS grade silver nitrate. The price estimate is minimal. Once you get it down it can be done in about 20 minutes per sample. Multiple samples done in sequence will require multiple sets of certain glassware items, or you will have to wait for the graduates and mixing cylinder to dry before the next text. Make sure the spec. operates at 560 nm; that is what the Hach reagents use.
Search used laboratory equipment. Contact Hach. They will send for free a laboratory handbook with much valuable information. Read the test for silver; that will tell you the glassware you need. You need to adapt the procedures if you are using other than their spec. This is not a trivial project, even if you are familiar with lab techniques, but can be done by most people having enough perseverance. The term "Beer's Law" does not just apply to the behavior of college freshmen. You may wish to compare your results with other labs to confirm your results. Bear in mind that most commercial labs using an AA spec. get spurious values with CS. I sent a lab in Albuquerque a sample that two other CS makers measured within 1 mg/L of my results (10) and the lab reported that it was 0.6 mg/L . You could see from the Faraday-Tyndall effect alone that the concentration was much higher than less than one mg/L. If you proceed, contact me for Kimball Labs contact info; he knows how to do it. You may wish to have him test your silver. For about 100 clams he will do a scan for common heavy metals (generally proving purity of silver used) and give you a good mg/L (PPM) reading. James-Osbourne: Holmes -----Original Message----- From: Chip Hoyle [mailto:[email protected]] Sent: Thursday, May 31, 2001 12:14 PM To: Silver List Subject: CS>Measuring particle concentration of colloids Hi everybody. I am wondering if there are any inexpensive instruments available that will measure the concentration of particles in both silver and gold colloids. I have my HVAC generator nearly ready to start using and I wanted to be able to measure PPMs with some accuracy. Does anybody know of anything cheap that will work? Thanks for any input. Regards, Chip Hoyle -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
