In a message dated 9/7/00 3:48:44 PM EST, [email protected] writes: << Subj: Re: CS>HVAC CS Date: 9/7/00 3:48:44 PM EST From: [email protected] (Robert L. Berger) Reply-to: [email protected] To: [email protected] Roger; When I used the aec method for CS it generated up to 80 ppm of NO3 with ia one big NO NO!. I solved the problem with the use of a SO2 blanket in the freeboard of the brew cell. I can make high ppm (25 in 2"30") with about 0.8 ppm of NO3 using 12 kv and a 7/16" arc gap. It appears that the amount of submerged electrcode is relative unimportant. One person uses two 3" x 6" electrodes. I have used two 1" x 5 1/2" electrodes and also two #14 wires shielded with glass and only the lower 2 1/2" of silver exposed. According to Dr. Bill Biagilio the FDA limit is 20 ppm of NO3, If the conductance goes over about 100 uS I d not use it even though it is crystal clear and with a weak T.E. Genetally the conductance is 50 to 80 uS as measured with a one cubic centimeter probe. The T.E. is always weak to very weak. My experience with the cone method has been very unsatifactory as I could not get more than 9 ppm without yellow or fall out, or bright T.E. "Ole Bob: >> "Ole Bob: Have you measured pH for your cone and arc techniques? If so, what were they? If you reduce silver wire diameter to #22, you might be able to induce sputtering which increase mass transfer (CS production rate) by 50-100 times. It appears that small areas on the molten silver sphere produced during sputtering become so hot that gaseous silver is produced (I've noticed bubbles forming from inside the liquid sphere. Admittedly, another explanation is that oxygen could be exolving). I believe that's why the HVAC sputtering technique does not produce significant quantities of nitrate or nitrite -- at sputtering temperatures none of these compounds is stable. Roger
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