| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| Engineerjaykumar | "The soil testing is done in different ways such as: -Surface exploration -subsurface exploration But for mining work a very sensitive and complex m..." | Read more » | about 4 years ago | |||
| DanielleS | " Thanks @Ag8n !! Do you want to join us to brainstorm about soil testing methods for contaminants at the OpenHour: Date: Monday, April 1st Time: 6..." | Read more » | about 5 years ago | |||
| evabeauty | " chirurgie esthétique tunisie chirurgie esthetique en tunisie chirurgie esthétique tunisie chirurgien esthétique Prix chirurgie esthétique en tunis..." | Read more » | about 5 years ago | |||
| Ag8n | " On pcbs (it's the chlorine part I 'm worried about, here), whenever you put a chlorine containing material in a flame, the flame should turn green..." | Read more » | about 5 years ago | |||
| warren | " Thanks @DanielleS! I added tags benzene,toluene,ethylbenzene,xylene and activity:soil and others to help connect this up with other pages. :tada: " | Read more » | about 5 years ago | |||
| Ag8n | " From a quick look, it seems that PAHs and PNAs (polynuclear aromatic hydrocarbons) are the same thing. We did PNA analysis on carbon black that w..." | Read more » | about 5 years ago | |||
| warren | "I wonder if NOAA will be posting imagery for Hurricane Maria in coming days -- perhaps @jasonwool or @willowbl00 can chime in on this? Thanks! " | Read more » | over 6 years ago | |||
| dhaffnersr | "@warren , Jeff, Please re-visit my research study on the crude oil sample I did: http://publiclab.org/notes/dhaffnersr/05-18-2016/crude-oil-analys..." | Read more » | over 7 years ago | |||
| dhaffnersr | "@warren , Yes jeff, oil under a UV laser pointer will fluoresce a "whitish blue" color, gasoline will fluoresce more "white" because it contains mo..." | Read more » | over 7 years ago | |||
| warren | "Hi, @dhaffnersr, are you saying htere are absorption peaks in the visible range (400-750nm) for 2-stroke oil and/or gasoline? I wasn't aware of tha..." | Read more » | over 7 years ago | |||
| dhaffnersr | "Hey @eatabean, you could centrifuge it yes, but the easiest way would be to do an absorbance spectral analysis, where you can get a snap shot of al..." | Read more » | over 7 years ago | |||
| eatabean | "I find this very exciting, yet it is too difficult for someone like me without the extensive knowledge in chemistry you and others here are showing..." | Read more » | over 7 years ago | |||
| dhaffnersr | "No jeff, ask as many questions as you like, there should be a lot more discussion and interaction between all of us here. I'm not using NaOH3, whic..." | Read more » | about 8 years ago | |||
| warren | "Thanks -- helpful. Also, though, can you elaborate a bit on this? separate the aromatic hydrocarbons from the oil sample, How does baking soda se..." | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey jeff! Bingo, yes, Isopropyl will work in some situations, although it is a polar compound, but like ethanol it does exhibit non-polar propertie..." | Read more » | about 8 years ago | |||
| warren | "Also, ethanol is a non-polar substance, excellent for dissolving hydrocarbons, but ethanol has many polar properties which make it ideal in situati..." | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey Jeff, I'll start posting more references, sorry, ok, the reason for this particular regent (solvent combination,) is to separate the aromatic h..." | Read more » | about 8 years ago | |||
| warren | "Hm, Dave, this is interesting, but I have a couple questions: each sample @ 3ml was dissolved in 5ml of regent, both samples allowed to separate n..." | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey estabean, great question, well I use ethanol because it can dissolve both polar and non-polar compounds, what this means is, like oil, gasoline..." | Read more » | about 8 years ago | |||
| eatabean | "This is very interesting, but I am so new to this and I have a question or two. Why are you adding ethanol to the solution? Doesn't the gasoline h..." | Read more » | about 8 years ago | |||
| dhaffnersr | "I am reposting the final plot graph for the 87 octane gasoline, I should have saved it in PNG form here it is again: " | Read more » | about 8 years ago |