To those of you who may need to use Carbon disulfide in a Lab,
I have been using Carbon disulfide for a few months as a solvent for Pomethazine hydrochloride infra-red identification. My protective gear is just a pair of latex gloves and a surgical mask in a fumehood . I would like to know the proper way to handle the chemical as I have to carry to liquid cell travel round the Lab and I can't definitely smell the vapour. It does have a strong effect on me in following way: dizziness, headache and Parkinson-like syndrome (continuously cause body shaking several days, and I am just 23).
I have look up on https://www.cdc.gov/niosh/npg/npgd0104.html that I should be wearing air-purifying respirator with organic vapor cartridge for anything higher than 500ppm. The Carbon disulfide I am using is >=99.9 which shown on the bottle. I am sure that my manger can't provide such level of protective gear.
Thank you for those who reply and read the whole post. English isn't my first language. Sorry if there is any grammar mistake and feel free to ask me for more detail if you don't understand any part of the paragraph.
The formation of discrete macrocycles wrapped around single‐walled carbon nanotubes (SWCNTs) has recently emerged as an appealing strategy to functionalize these carbon nanomaterials and modify their properties. Here, we demonstrate that the reversible disulfide exchange reaction, which proceeds under mild conditions, is ideally suited to install relatively large amounts of mechanically interlocked disulfide macrocycles on the one‐dimensional nanotubes. Presumably as a result of error‐correction and the presence of relatively rigid, curved π‐systems in our key building blocks, we observed evidence for the size‐selective functionalization of a mixture of SWCNTs of differing diameter. Specifically, a combination of UV/vis/NIR, Raman, photoluminescence excitation (PLE) and transient absorption spectroscopies indicated that the small (6,4)‐ SWCNTs were predominantly functionalized by the small macrocycles 1 2 , whereas the larger (6,5)‐SWCNTs were an ideal match for the larger macrocycles 2 2 . The observation of size selectivity, which was rationalized computationally, could prove useful for the purification of nanotube mixtures, because we were able to remove the disulfide macrocycles quantitatively under mild reductive conditions.
https://ift.tt/3hwZB58
Hello! I'm working with a team to design a FBR to produce dimethyl sulfide C2H6S (DMS) from Methanol + CS2 but all of the current resources we have plus GayLord Chemical Company (biggest DMS manufacturer) use H2S instead of CS2 since it is probably cheaper to obtain from any local refinery or gas plant! Any ideas if that reaction is possible with CS2, then what other products will be produced with DMS CH3OH + CS2 > DMS +??? Thank you guys!
I need help, fast! I am training to replace the CHO at a small college, and we are needing to dispose of an old 1 L bottle of carbon disulfide. However, we can only dispose of 1000g of P-listed waste at a time, so the plan has been to pour some from the large bottles into smaller bottles, each with about 300g.
The problem is, the bottle has a Sure/Seal on it, and the current CHO wants to remove that cap and pour it into small bottles. I am uncertain about the safety of this. He said we could use a syringe but that will just produce more waste we need to dispose of.
Naturally, my concern is that there may be a spark as he pries off the lid, causing a fire or an explosion. Am I just being paranoid? Is what he wants to do safe? It's a bit hard to defend my position having been in training for only 5 weeks, and he has been CHO for over 30 years.
https://www.theatlantic.com/health/archive/2016/12/testicular-hysteria/511793/
This is only tangentially related to the themes of this sub, but some people might find this article interesting, so I submitted it as a selfpost. I think the history of the "Hysteria"-diagnosis and all the sexist connotations that come with it are pretty well known here, but I found it fascinating to read that for a while there actually was a male counterpart to this stereotypical "women's illness". And it seems that in these cases, the cause (carbon disulfide poisoning) was relatively solid established, as opposed to all the "upset uterus"-bunk.
>The historian Mark Micale calls the final decades of the 19th century “the Belle Époque of hysteria.” The term had been recorded in text dating back to Plato and Hippocrates, and it was common in the Victorian era as a vague dismissal of most any symptom experienced by women, but its modern canonized form as a “scientific” entity happened in Paris. Diagnosing men with hysteria came into style, led by Charcot. And it was an equal-opportunity malady; during the 1880s, Charcot published more than 60 case histories of male “hysterics.”
>It wasn’t that the behavior he described didn’t exist prior to the 1880s, Micale has explained. “It did exist. It was rampant. Men were as prone to nervous breakdown as women were. It was not diagnosed for social and political reasons. Men were believed to be more sane, more motivated by reason, more in control of themselves emotionally. If you were to diagnose it honestly, that would have pretty quickly called into the question the difference between the sexes and the idea that men were more self-possessed than their fragile, dependent female counterparts. Ultimately it came down to patriarchy and power.”
To lay a foundation for the section below, I want to start with the science behind your hair's structure. This can be a big step in understanding the cause of your hair challenge. Your strands are mostly made up of a keratin protein, which consists of the COHNS elements (Carbon, Oxygen, Hydrogen, Nitrogen and Sulfur). These elements create the following bonds in your hair:
- hydrogen bonds
- salt bonds
- disulfide bonds
Disulfide bonds can cause permanent change in the hair structure, allowing us to perform services like perms and color. They are also responsible for the hair’s strength. Hydrogen bonds cause temporary change and adjust the hair's shape, for example, during washing and drying. We can use this knowledge to our advantage when styling - weather induced frizz can be reset simply by rinsing with water and styling in a new way. Check out this guide titled "Hair Frizz Science: Water and Hydrogen Bonds" to learn more. The big takeaway I want you to have before jumping into the section below is this: the further we push the limits of our hair the more challenges we may face.
DESCRIPTION: The hair will look dull and puffy.
CAUSES: over-shampooing, over-styling, coloring too often, damage
OVERVIEW: When the outer layer of the hair shaft (i.e. cuticle) is swollen or lifted, the hair can visually appear dry and have trouble holding moisture. Simply put, the hair is dry after the hair shaft is repeatedly damaged. This is why most of the information on dry hair and damaged hair is so similar. The key difference between the two is damaged hair leads to dry hair (and eventually breakage), while damaged hair is not caused by dry hair, but by chemicals (for example, color, perms, relaxers). When a strand's cuticle is healthy it will not be dry.
THE FIX: Use moisturizing products. My favorite moisturizing ingredients are silicones, such as dimethicone and panthenol (vitamin b5). Consider using oils that act as emollients, moisturizers, occlusive agents and humectants that seal in moisture and provide an increased
... keep reading on reddit ➡Hello, chemistry dummy here. I've been prodding the internet for answers with no luck.
I have a piece of historical bone (~200 years) from a human burial. On the bone is a substance that, if it were modern, I'd swear it was metallic gold paint. As it oxidized over the course of days, the substance lost some but not all of its sheen, darkened, dulled. But not all of it. It's still shiny in places, ranging from the dull color of pyrite to the color of gold to the color of copper, which is why I initially thought it was a gold amalgam. It isn't.
photo with incandescent bulb direct light
video to show sheen under florescent ceiling light
To our confusion, the "paint" is largely (>40%) sulfur (other traces in decreasing order: O, C, Si, Ca, P, Al, Fe; C and Ca assuming mostly from the bone itself).
In the below image, the carbon is bone without any other substance on it. Yellow is sulfur, the "gold paint" substance.
https://preview.redd.it/a0mc5rqzuq581.jpg?width=1985&format=pjpg&auto=webp&s=98b34e02a788e3bf269af2f22e7c6124c5ddb286
The person who did the scanning isn't sure what to make of the "metallic sulfur" either.
All I can think of is pyrite (FeS2). There are trace elements of iron in the substance, though less than that of what a scan of actual pyrite looks like.
But here's my confusion: can pyrite be made into a leaf, like gold/zinc/copper can? Can pyrite be made into threads for a fabric? A paint-like substance?
If not, then how can a substance that's largely sulfur become so thin as to appear painted onto a surface and look like gold/gold-amalgam leaf? Could it be iron disulfide in powder form that some how ended up looking like paint? Did sulfur react to some other substance, becoming metallic? Was it a sulfur-based fabric dye and the fabric rotted away? How can it look "melted" as if turned into liquid?
I am so confused. Help me, Chemistry Reddit. TIA.
Do your worst!
For context I'm a Refuse Driver (Garbage man) & today I was on food waste. After I'd tipped I was checking the wagon for any defects when I spotted a lone pea balanced on the lifts.
I said "hey look, an escaPEA"
No one near me but it didn't half make me laugh for a good hour or so!
Edit: I can't believe how much this has blown up. Thank you everyone I've had a blast reading through the replies 😂
A sequel to Blue Crystal Biology and Cannonball Biology.
Vitrium is a small, warm world--a half-way point between Venus and Mars.
A weak magnetic field and strong solar radiation have stripped it of most of its primordial volatiles, and particularly depleted it of hydrogen, leaving the surface heavily oxidized--but unlike Mars, and like Venus, it had enough sulfur to retain a small amount of hydrogen locked up in sulfuric acid, with a small amount (approximately 1.7%) of dissolved water. Many planetologists believe that Vitrium in fact passed through a Venusian stage in its early history, before losing enough atmosphere to cool down to the point that oceans could form (with present-day surface temperatures ranging between 50 and 150C, comfortably in the middle of sulfuric acid's liquid range); others, however, think it more likely that the planet simply started out with a relatively low carbon fraction, such that early heating and hydrogen loss were driven primarily by a water, rather than CO2, atmosphere.
As on Venus, sulfuric acid forms clouds on Vitrium, as well as rain, and pools into numerous small seas. Sulfur trioxide also forms thin clouds in the upper atmosphere, but temperatures are too high to support liquid sulfur trioxide anywhere on the surface. The relatively small amount of surface liquid means that Vitrium has no globe-spanning oceans or well-defined global sea level, with most sea basins being entirely disconnected from each other, and having been disconnected for as long as the world was cool enough for seas to form. Nevertheless, lifeforms in each basin are broadly similar, indicating that the current biological system originated originated in one place and thence colonized the rest of the world.
As on Blue Crystal, life on Vitrium makes extensive use of silicon as a scaffolding element for biomolecules--but unlike Blue Crystal life, Vitrium's biology almost entirely avoids unstable Si-Si bonds, instead relying on strong silicon-oxygen bonds to form organosilicone, or siloxane, polymers, with Si-C and C-C bonds used in various functional groups (in particular, C-C bridges are frequently employed analogously to disulfide bridges used in Earthling biology; despite the much greater bioavailability of sulfur on Vitrium, C-C bonds are sometimes required for their greater stability i
... keep reading on reddit ➡They’re on standbi
Pilot on me!!
