| 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 » | over 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 » | over 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 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 » | almost 3 years ago | |||
| Ag8n | "Clarification. Acidic media is pH 3. " | Read more » | almost 3 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 » | almost 3 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 » | almost 3 years ago |