Comments

Author Comment Last activity Moderation
Ag8n " I've used a version of this method. We used it for lead and just for visual comparison. There was a link for it but it wouldn't work. It was th..." | Read more » over 5 years ago
Ag8n " I'm downloading it now. Give me a day or two to go through it. Thanks! " | Read more » over 5 years ago
Ag8n " You might be able to find some thing. Let's take it step by step. First, the only one of those metals that has any color in the Vis is chromium. ..." | Read more » over 5 years ago
Ag8n " First, using a spectrometer in the visible range ,by itself, normally isn't possible. You normally have to add chelating agents to make the metal..." | Read more » over 5 years ago
Ag8n " There are several manufacturers of handheld XRF analyzers. And yes, they are usually cost limited. The cost can be reduced somewhat by renting, i..." | Read more » over 5 years ago
Ag8n " Just realize, these methods are far from being implemented. The mercury one is " proof of concept", which means it still needs troubleshot, valid..." | Read more » over 5 years ago
Ag8n " I've never seen FTIR used for mercury detrmination. Usually, that is a variation of AA. The instrument set up you show is for transmission. Pro..." | Read more » over 5 years ago
Ag8n " I like the idea. But why are you selecting ftir? " | Read more » over 5 years ago
Ag8n " Yes, ion exchange is a good idea. Usually, it's cation exchange, anion exchange, and actived charcoal, followed by the particle filter. A conduc..." | Read more » over 5 years ago
Ag8n " One item tried in industry was to take good quality water and run them through filters small enough to stop microbes ( the last I heard, about 0.2..." | Read more » over 5 years ago
Ag8n "My background is mostly industrial- specifically pharmaceutical. So much of the testing was guided by something like The USP. The instruments were..." | Read more » over 5 years ago
Ag8n "As for what method can do soil, paint, water, etc. Edxrf has a big problem with water. Water absorbs xrays. You can get around this by evaporati..." | Read more » almost 6 years ago
Ag8n "As for what method can do soil, paint, water, etc. Edxrf has a big problem with water. Water absorbs xrays. You can get around this by evaporati..." | Read more » almost 6 years ago
Ag8n "As for difficulty: Worst is ICP- ME ICP-OES GFAA AS EDXRF Wet chemical Easiest Many of the wet chemical methods can only detect heavy metals as le..." | Read more » almost 6 years ago
Ag8n "Read- ICP-MS is the premier method.no doubt. But you pay for it. I'm second place is ICP-OES (ICP-optical emission spectrometry). Pretty much th..." | Read more » almost 6 years ago
Ag8n "I'd be happy to help. Give me some time to look it over. I've worked extensively with EDXRF, but mostly the desktop (read R&D) variety. Only..." | Read more » almost 6 years ago
Ag8n "I've done a lot of lead testing. This was mostly by atomic absorption (AA), in an industrial situation. The specs have changed. The lead levels ..." | Read more » almost 6 years ago
Ag8n "It's listed on Amazon as the Atlas Scientific EZO-DO. It is listed at $46.00. It talks by uart, so a Pi might work. Atlas Scientific should have ..." | Read more » almost 6 years ago
Ag8n "The recommended limit of pfoa + pfos is 70 parts per trillion (!). That's recommended, it's not enforced. The method of analysis is by LC/MS/MS. ..." | Read more » almost 6 years ago
Ag8n "Amazon lists a microprocessor based circuit for about $46. That does not include the probe, case, or many other requirements. But it is a start. ..." | Read more » almost 6 years ago
Ag8n "You might be surprised at what goes into storm sewers. The plant I worked at had a "branch" of about 40 people. Anyway, because of its small size..." | Read more » almost 6 years ago
Ag8n "Thank you for the reply. What are you using for your UV source? The deuterium lamp from the spectrophotometer? Thank you. " | Read more » about 6 years ago
Ag8n "That was supposed to be absorbance , not abstinence. Darned autocorrect. " | Read more » about 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 » about 6 years ago