JOH wrote: > That gives total Ag in any sample; how do you separate them?
To separate the ions from particles in a colloid by the following methods: 1. Ultra-centrifugation - 350,000 G-forces for 15 minutes will separate particles down to two atomic diameters leaving only the ions. Decant off the ionic solution and measure by atomic absorption/emission spectroscopy to read the ppm of the ionic content. 2. Freezing - freeze the colloid to a solid block of ice, then thaw. The particles will fall to the bottom leaving only the ions. Decant off the ionic solution and measure by atomic absorption/emission spectroscopy to read the ppm of the ionic content. 3A. Precipitation - the ions can be precipitated into silver chloride by adding a drop of diluted hydrochloric acid. Let sit for a day so the silver chloride settles out leaving only the particles, or separate the precipitate using a centrifuge. Decant off the silver colloid and measure by atomic absorption/emission spectroscopy to read the ppm of the silver particles. 3B. Precipitation - same as 3A but using sodium hydroxide to precipitate the ions out as silver hydroxide. Frank Key Colloidal Science Lab http://www.ColloidalScienceLab.com -- The Silver List is a moderated forum for discussing Colloidal Silver. Instructions for unsubscribing are posted at: http://silverlist.org To post, address your message to: silver-list@eskimo.com Silver List archive: http://escribe.com/health/thesilverlist/index.html Address Off-Topic messages to: silver-off-topic-l...@eskimo.com OT Archive: http://escribe.com/health/silverofftopiclist/index.html List maintainer: Mike Devour <mdev...@eskimo.com>
