Author Comment Last activity Moderation
Ag8n "According to the spill contains vinyl c..." | Read more » about 1 month ago
Ag8n "Now, to change the topic a little bit. What happens once all this testing gets going? In industry, a financial auditor appears and says " you are..." | Read more » 3 months ago
Ag8n "There are variations on the method, but check out the USP if using for medical applications. The oldest is a straight " gel clot". The sample is ..." | Read more » 3 months ago
Ag8n ""Pharmacopeia online" is at "". " | Read more » 4 months ago
Ag8n "The Wikipedia article is an interesting read. The initial data said horseshoe crab mortality from L.A.L. testing should be about 3%. However, rec..." | Read more » 6 months ago
Ag8n "Here's where life gets a bit interesting. There are substances called pyrogens. These cause a fever, sometimes severe, even if the carrier bacteri..." | Read more » 6 months ago
Ag8n "As a refresher, read USP 31, <1231>"Water for Pharmaceutical Purposes". This is available, for free, from Pharmacopeia online, as mentioned ..." | Read more » 6 months ago
Ag8n "Error here. It should not be objective c, as noted above. It should be some plastics are showing higher extractables than bulk water. Something..." | Read more » 6 months ago
Ag8n "Getting a hold of the USP used to be difficult and expensive. While current USP may still be expensive, here is a source for older versions. "Pha..." | Read more » 6 months ago
Ag8n "USP/BP/EP means United States Pharmacopoeia,BP is British Pharmacopoeia, and EP is European Pharmacopoeia. Sections of the USP are divided into mo..." | Read more » 6 months ago
Ag8n "The CO2 produced can be measured several ways. Each method has advantages and disadvantages and depends on the final use of the instrument. For exa..." | Read more » 6 months ago
Ag8n "If you want an overview of TOC, Wikipedia is a good start. The current article seems pretty thorough ( dated 19 July 2022 by Any c..." | Read more » 6 months ago
Ag8n "Previous methods could be somewhat hazardous. To give an example, ammonia related chemicals often work their way into drug compounds. It can be f..." | Read more » 7 months ago
Ag8n "Going back over this. We did a lot of work with total organic carbon (TOC). According to Dr. Paul Whitehead at (the blog title is..." | Read more » 7 months ago
Ag8n "Some vehicles, in most major cities, have to be tested annually for fuel emissions and mpg. Not all vehicles must be tested and the fuel emissions ..." | Read more » 10 months ago
Ag8n "This one is difficult. Carbon dioxide isn't transported through pipelines as a gas. Instead, they are talking about sending it through as a super..." | Read more » 11 months ago
Ag8n "The USP is a good starting point. You have to choose between NIST, primary standard, and other grades. Do you know what reagents you will be using..." | Read more » 12 months 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 » about 1 year 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 » about 1 year 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 » about 1 year ago
Ag8n "Maybe transmission is possible. Most of the materials we analyzed could only be tested with reflectance. See if that makes sense for the material..." | Read more » about 1 year ago
Ag8n "The nir instruments are heavily used in agriculture. The company I worked for wanted to use Near Infra-Red (reflectance), also called NIRR, to dete..." | Read more » about 1 year ago
Ag8n "Please go to the web page mentioned. You will see that this test works by reacting the extract with iron (III) chloride. Many other materials wil..." | Read more » about 1 year ago
Ag8n "A better approach would be Uv/ vis. Phenols, such as BPA, absorb at about 280 nm. So you would set up an extraction to pull out the BPA and run a..." | Read more » about 1 year ago