Well there you go, (Are you there ole Bob) It just shows you the unreliability of using conductivity as a measure of concentration (ppm) of colloids, unless they are used within strict parameters. Although, if Robert uses his PWT in the same manner every time, then the chances are that he will have good correlation between his reading and the actual concentration.
The relationship between silver IONS (Ag+ as distinct from colloid particles) is 1.76 at 5ppm and 1.78 at 20ppm, so lets say 1.77. That is the uS reading times 1.77 is the concentration in mg/L (ppm). 1.77ppm / uS or 0.57uS / ppm. In full... 0.57 uS cm^2 / mg. So 5ppm will read 2.8uS 10ppm will read 5.7uS 15ppm will read 8.5uS 20ppm will read 11.3uS The above is true for a silver colloid that is made with some regard to current limiting (density) and minimal sludge inclusion, AT THE TIME THE POWER IS WITHDRAWN FROM THE ELECTRODES. Many will find that the conductivity or ppm reading will rise as time passes, even to a point where the reading is double the actual silver concentration. The uS reading of well made CS seems to rise until the ppm equals the uS reading and remains stable at this point. The rate and the amount this occurs can be some indication of the quality of the colloid, that is, the amount of uncharged particle inclusion, and the amount and rate of flocculation or particle aggregation. Ivan, ----- Original Message ----- From: "Robert Dohr" <[email protected]> To: <[email protected]> Sent: Thursday, 13 April 2000 10:35 Subject: Re: CS> Hanna Meter > Greetings Seekers; > Regarding Hanna Meters TDS & PWT. I have the PWT #98308. I know Ken (Coyote) > has the TDS1. We have been comparing notes on batches made using the same CZen > generators. As for me I spoke to the techs at Hanna. They said that with the > PWT which measure conductance in us/cm, to convert to PPM I should divide by > two. I made a sample batch of CS which measured 25.5 us/cm and sent it to the > lab at CSPro systems to have it tested by PhotoSpectrometry. The results came > back at 15 PPM. That would be 59% of the measured reading. This is how I now > measure all my batches. Ken can tell you what fudge factor he uses for his > TDS1. How about it Coyote? > NAMASTE' > Beldohr -- 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]>
