Comments

Author Comment Last activity Moderation
Ag8n "Look up conductivity cell and wheatstone bridge Instead of feeding DC into the weatstone bridge, the audio signal is fed in. One leg of the wheats..." | Read more » about 2 years ago
Ag8n "It looks like the Coqui is a pretty well designed instrument. But, some of the pharmaceutical instruments would send the tone through a bridge. T..." | Read more » about 2 years ago
Ag8n "The last heard, Ohio decided it was excessive levels of fertilizers that caused the problem. So, the solution was to limit when fertilizers could ..." | Read more » about 2 years ago
Ag8n "Believe it or not, during the seaon, this is on the weather segment of the local news. The local water intakes (Cleveland) are often threatened by..." | Read more » about 2 years ago
Ag8n "The results you were given aren't "top of the line". To be honest, the book keeping is kind of shoddy. Normally, there would be reference to the t..." | Read more » over 2 years ago
Ag8n "We also used graphite furnace AA, also called GFAA. One common analytical instrument is ICP (inductively coupled plasma). I've used them a couple..." | Read more » over 2 years ago
Ag8n "Another reference. "Some recent developments in atomic fluorescence spectrosopy" by T.S.West Analytical Chemistry, ( presented at 26 th internati..." | Read more » over 2 years ago
Ag8n "Here are a couple of reference: "Studies in atomic fluorescence spectroscopy -III:microwave excited electrodeless discharge tubes as spectral sour..." | Read more » over 2 years ago
Ag8n "You know, getting a couple of these that could be "disposable" might not be a bad idea. Working with 400 volts isn't a terribly high voltage, but ..." | Read more » over 2 years ago
Ag8n "That looks like a hollow cathode lamp. We used perkin elmer, not fisher, so there could be differences. The lamp should have the element it can d..." | Read more » over 2 years ago
Ag8n "Aanalyst (a model of atomic absorption spectrometer that we had)hollow cathode lamps new are running for about $350. So when there are hollow cat..." | Read more » over 2 years ago
Ag8n "That looks like a hollow cathode lamp. But there are other kinds. It should have the element on the base plus usually the operating current range..." | Read more » over 2 years ago
Ag8n "I worked a lot on lead with atomic aborpion(AA) and related techniques. The two lead lines we normally used were 283 nm and 214 nm. Of course, the..." | Read more » over 2 years ago
Ag8n "The first article from" research gate "is a little more interesting. It has lead forming something similar to chelates. The summary of the articl..." | Read more » over 2 years ago
Ag8n "The last paper mentioned above is(I think) using chemiluminesence to generate the light(Flouescent detection of lead in... ByYan- Shiuan Wu, Et a..." | Read more » over 2 years ago
Ag8n "On battery life- it wasn't very good. Mercury (as in mercury lamps) have a lot of lines that go all through the uv/vis spectrum. For a while(as in ..." | Read more » over 2 years ago
Ag8n "I got one of the 254 nm UVC lamps that might be usable for an uv/vis instrument as a gift . It's advertised as for sterilization of surfaces. The ..." | Read more » over 2 years ago
Ag8n "Sorry, but I only have access to the abstract. The wavelength mentioned there is 633 nm. Is the correct wavelength 633 nm or 533 nm? Regards " | Read more » over 2 years ago
Ag8n "The data shows that natural titration indicators with long shelf life (90 days) do exist ( see the Hippeastrum note above). However, Red cabbage d..." | Read more » over 2 years ago
Ag8n "The research shows that natural titration indicators, with good shelf life, do exist ( see Hippeastrum, above). However, Red cabbage does not appe..." | Read more » over 2 years ago
Ag8n "The acid (from the pH 3 solution ) for the cabbage indicator could mess up some titrations. A blank might need run(and, depending on the titration..." | Read more » over 2 years ago
Ag8n "Clarification. Acidic media is pH 3. " | Read more » over 2 years ago
Ag8n "Check this reference: "Evaluation of red cabbage dye as a potential natural color for pharmaceutical use" by Neela Chigurupati, et. al. Industrial..." | Read more » over 2 years ago
Ag8n "Some natural indicators can have shelf lives of up to 90 days in solution. See "Hippeastrum hybridum anthrocyanin indicators of acid - base titrat..." | Read more » over 2 years ago