Comments

Author Comment Last activity Moderation
Ag8n "Thank you for the reply. What are you using for your UV source? The deuterium lamp from the spectrophotometer? Thank you. " | Read more » over 6 years ago
Ag8n "I'm very interested in your next steps and where you are going with this. Any details? Thank you. Regards. " | Read more » over 6 years ago
Ag8n "Kite messengers could support a nano computer device, but for what purpose? I'm not sure. I've always liked Scott sleds as kites, not because of ..." | Read more » over 6 years ago
Ag8n "That was supposed to be absorbance , not abstinence. Darned autocorrect. " | Read more » over 6 years ago
Ag8n "Is there a reason you are using spectrophotometry instead of spectrometry? Spectrometry would be much less expensive. Is your application sensiti..." | Read more » over 6 years ago
Ag8n "Thanks! Give me a couple of days and I'll email you a more detailed description. The help is appreciated! " | Read more » over 6 years ago
Ag8n "The older usp method was based on hydrogen sulfide. This was later changed to a thioacetamide based test. This is better, but still not good. The..." | Read more » over 6 years ago
Ag8n "There are a few " killers" in the referenced article. One was the remark about converting arsenic to volatile hydrides. One of those hydrides cou..." | Read more » over 6 years ago
Ag8n "I see what you mean. The analysis I did was a PNA (polynuclear aromatic hydrocarbon analysis). It's closely related to PAHs. It's still listed on..." | Read more » over 6 years ago
Ag8n "There is a standard method for PAH analysis in carbon black. It uses soxhlet extraction and visible analysis ( sorry I can't give you the details..." | Read more » over 6 years ago
Ag8n "The best person to ask is the manufacturer. There are so many fine grades of carbon, say for example soot or very fine grades of carbon black, tha..." | Read more » over 6 years ago
Ag8n "A partial answer. Each block of analyzers is heated to 37.0 C . They do not use a spectrometer. Instead, each cell in the analyzers has a led (a..." | Read more » over 6 years ago
Ag8n "I apologize if I misunderstood. I was going by the description on the "call for papers". I have no expectations, except pragmatism. If you don't ..." | Read more » over 6 years ago
Ag8n "I just wanted to get something going on this site. If it stays dead, it will be. Getting published is a hassle. All the editing from co- authors..." | Read more » over 6 years ago
Ag8n "Thank you for your reply. Very good sir. That would save time! " | Read more » almost 7 years ago
Ag8n "I like energy dispersive X-Ray florescence (EDXRF). It's non-distructive, low power, and relatively cheap. On the down side, it's hard to calibra..." | Read more » almost 7 years ago
Ag8n "We always went with the longest path length. The visual test was done with 50 cm color comparison tubes. Very long for visual. Maybe you could d..." | Read more » almost 7 years ago
Ag8n "Do you know what APHA values you will be observing? I was typically observing values under 25. And yes, a florescent light was very helpful again..." | Read more » almost 7 years ago
Ag8n "Madtinker- I've seen "universal" pH indicators before. Interesting, using them with the spectrometer. You would probably need to filter the water..." | Read more » almost 7 years ago
Ag8n "If you used the right lamp, you would be ok. You need to use a broadband source, as stoft noted. " | Read more » almost 7 years ago
Ag8n "Try to avoid using blue water solutions, at least without doing some testing. The compact florescent lamps (CFL) loose intensity at the blue and o..." | Read more » almost 7 years ago
Ag8n "Yes, it can. You need to go to the spectrometer page for more information. It will show how to set up cuvette s to hold water and what to use as ..." | Read more » almost 7 years ago
Ag8n "There is a book " standard methods for the examination of water and waste water" that goes over most testing. The best suggestion is to talk to th..." | Read more » almost 7 years ago
Ag8n "In the lab where both epa and fda testing was done, we always used the turbidity meter. We used color comparison tubes, too, just not for turbidit..." | Read more » almost 7 years ago