| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| Ag8n | "There is a closely related chemical recently added to the USP for uv/vis standardization. It is a solution of didymium. Some places also use a gl..." | Read more » | almost 3 years ago | |||
| Ag8n | "https://youtu.be/u5tUmdWALn0 Hopefully, this link works to the video " | Read more » | almost 3 years ago | |||
| Ag8n | "Of you take a look at commercial instruments, they will usually use holmium oxide or other holmium salts for calibration. Great. These salts are ..." | Read more » | almost 3 years ago | |||
| Ag8n | "Found something.It's a YouTube post by chem_talk on neodymium. It's a long way from complete, but according to the post, this rare earth isn't rar..." | Read more » | almost 3 years ago | |||
| Ag8n | " Density is difficult to use. Many manufacturers use fillers like titanium dioxide as a filler. This will dramatically alter the density, dependin..." | Read more » | almost 5 years ago | |||
| Ag8n | " With PVC, as the plastic degrades, you get more and more conjugated double bonds. Hate to get chemical, but the where the plastic absorbs starts ..." | Read more » | almost 5 years ago | |||
| Ag8n | " Check the "baby legs" projects on microparticles. It will give some background. My own experience was in medical plastics industry. We routinely ..." | Read more » | almost 5 years ago | |||
| Ag8n | " With your vbat pin, did you connect it directly to the +3.3v or go thru a pull up resister? What value resister did you use? Very interesting pr..." | Read more » | over 5 years ago | |||
| Ag8n | "If you are trying a direct comparison ( apples to apples), see how the analytical lab is testing your samples. Probably, they will be using an adv..." | Read more » | almost 6 years ago | |||
| Ag8n | "A couple of gottchas here. I think you want to use the lego spectrometer with a light source. The light source would be fed through a cuvette fil..." | Read more » | almost 6 years ago | |||
| Ag8n | "Thank you for the help programmer 1200! " | Read more » | almost 6 years ago | |||
| Ag8n | "Well, exactly what approach are you thinking of? Let's see if the already tried can be eliminated and maybe make it easier to make progress. " | Read more » | almost 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 » | about 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 » | about 6 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 » | about 6 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 » | about 6 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 » | about 6 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 » | about 6 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 » | about 6 years ago | |||
| Ag8n | "Call them on the phone and talk to their salesman. Talk to tech services of you have to, but sales is usually better. A word of warning, the sale..." | Read more » | about 6 years ago | |||
| Ag8n | "That's a lot of money. Nir is using overtones of IR bands. So you might be able to get by with something like atr with an IR. Just can't see that..." | Read more » | about 6 years ago | |||
| Ag8n | "Frequently, in agriculture, near infra-red (NIR) is used, often for grain ananysis. One item is moisture. They will change the amount the farmer ..." | Read more » | about 6 years ago | |||
| Ag8n | "I think stoft (see above) has some good suggestions. Calibrating more often is also a good idea. Better standards, Holmium oxide for example, wou..." | Read more » | about 6 years ago | |||
| Ag8n | "Haven't heard of that one. Thank you. I'll look it up! " | Read more » | about 6 years ago |