He says silver, not silver and hydroxide ions. Andy In a message dated 8/18/2008 8:41:19 A.M. Pacific Daylight Time, [email protected] writes:
He is saying that the drift veloicty of sodium and chlorine ions is twice the drift velocity of silver and hydroxide ions. That will translate into twice the conductivity. Marshall [email protected] wrote: > Hi Steve Foss. > > Regarding your statement: (9th paragraph down) > > "Sodium Chloride or table salt has twice the conductivity of Silver. > Or Silver has 1/2 the conductivity of table Salt. So any measurement > of Colloidal Silver will be half of that for dissolved solids." > > Are you saying that salt is more conductive than silver? I don't > understand. Please elaborate. > > Thanks, > Andy > > In a message dated 8/16/2008 9:14:38 A.M. Pacific Daylight Time, > [email protected] writes: > > Hi Silver List, > > "What multiplier do you use and how accurate do > you think your measurements are???" > > I use 4 as the multiplier with TDS meters. Why? > > To date no major reputable commerical manufacturer produces > a meter to specifically test for PPM levels for Colloidal Silver > Suppensions. When I asked (Hannah), "Not enough sales to justify > manufacture, to small a market." > > A TDS meter is designed to measure Total Dissolved Solids in > soltion for applications such as hydroponic gardening, testing tap > water and Reverse Osmosis water, industrial uses for contaminants. > > The typical TDS meter measures from 0 ppm to 999 PPM and was not > designed to measure small measurements with an accuracy of less > than 50% under 100 of PPM > > TDS meters measure transconductance (opposite of resistance) in > micro Siemens and then use circuitry to convert this measurement > into a PPM number (called a Conversion Factor). > > The Conversion Factor circuitry "translates" roughly 1 micro > Siemen into 1ppm at Part Per Million readings of 100 PPM or higher > at 90% accuracy. At PPM levels lower than 100 PPM the Conversion > Factor translates 1 micro Siemen as 0.5 PPM, 50% of what is measured. > > TDS meters were designed to measure dissolved solids conductivity > and are calibrated with Sodium Chloride (the "yellow" solution > sold with these meters) as a rough "Guesstimate." Salt is used as > an average approximation of the conductivity of the compounds and > elements (and polutants) found in water. (Potassium Chloride is > the world standard for calibration, but then TDS meters do not > require scientific accuracy.) > > Soldium Chloride or table salt has twice the conductivity > of Silver. Or Silver has 1/2 the conductivity of table Salt. So > any measurement of Colloidal Silver will be half of that for > dissolved solids. > > TDS meters round off their measurements downwards after > conversion. 0 to 0.9 PPM will read as 000 PPM. Likewise, 1 to > 1.9 PPM reads as 1 PPM, etc. > > Let's use some numbers. Let's say I have finished a batch of CS > and send half of it to a lab that runs an Atomic Aborption > Spectragraphy. The batch was made with Lab & Tech distilled water > (0 PPM). The test measurement is 10 ppm > > I reach for my trusty TDS meter. The meter measures 90 % of the > transconductace (calibrated to Sodium Chloride which has twice > transconductance of CS) so 4.5 only is measured and the > conversion factor has a 50% error (under 100ppm readings) so 2.25, > rounded down becomes 2 PPM. > > I have a batch of 30 PPM CS. 15 X 90%= 13.5 microS measured > multiplied by 50% Conversion=6.75 rounded down to 6 ppm > > If I have a reading of 3 PPM X 4= 12 PPM (3 times 2 (for > Conversion Factor) times 2 (Salt factor) equals 12 PPM) > > This doesn't account for Commerical Distilled water which measures > from 0 to 2 ppm (0 to 4 ppm if taking into account the Conversion > Factor from circuitry). The DW will measure as 0 ppm at levels as > high as 1.9 ppm (actual). > > That is why I use the number 4 as a multiplier when using a TDS > meter to measure CS batches. > > How accurate do I think these measures are with TDS meters? > > Not very accurate, but better than nothing, or shelling out $400 > USD everytime I make CS to get an accurate reading. > > Regards, > > Steve Foss > > If you are using Sodium Chloride or Sodium bicarbonate as an > electrolyte this muddies the water (and the measurement) further. > > > >Question for the group: What multiplier do you use and how > accurate do > you think your measurements are??? > > Just make sure the TDS meter probe is not contaminated when measuring, > make sure there are no bubbles on the probe tips and do not try to > measure moving water (keep TDS meter still in water). > - Steve > > < > >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.. > > > > Hi Steve. How does one use a TDS meter? Thanks. Faith G. > > > > > ------------------------------------------------------------------------ > Looking for a car that's sporty, fun and fits in your budget? Read > reviews on AOL Autos > <http://autos.aol.com/cars-Volkswagen-Jetta-2009/expert-review?ncid=aolaut00030000000007>. -- 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: [email protected] Address Off-Topic messages to: [email protected] The Silver List and Off Topic List archives are currently down... List maintainer: Mike Devour <[email protected]> **************It's only a deal if it's where you want to go. Find your travel deal here. (http://information.travel.aol.com/deals?ncid=aoltrv00050000000047)
