While some people got pulled into "Black Friday", at my place I was enjoying "Red Friday"!! Two days ago my star crape myrtle's leaves turned red! I know this is not a big deal to those of You already in the blizzardy, snowy aspects of winter. However, in South Texas (not known for fall colors), it is a very big deal to see a flame red bush in the yard! A burning bush indeed! Enjoy Your photostudy of my crape myrtle in the front yard. (Of course, a few other surprises revealed about red friday!)
Support our troops
Hydrogen sulfide (British English: hydrogen sulphide) is the chemical compound with the formula H2S. It is a colorless, very poisonous, flammable gas with the characteristic foul odor of rotten eggs. It often results from the bacterial breakdown of organic matter in the absence of oxygen, such as in swamps and sewers; this process is commonly known asanaerobic digestion. It also occurs in volcanic gases, natural gas, and some well waters. The human body produces small amounts of H2S and uses it as a signaling molecule.
- FeS + 2 HCl → FeCl2 + H2S
- 6 H2O + Al2S3 → 3 H2S + 2 Al(OH)3
Removal from fuel gases
Reaction with iron oxide
- Fe2O3(s) + H2O(l) + 3 H2S(g) → Fe2S3(s) + 4 H2O(l)
- 2 Fe2S3(s) + 3 O2(g) + 2 H2O(l) → 2 Fe2O3(s) + 2 H2O(l) + 6 S(s)
- 0.00047 ppm or 0.47 ppb is the odor threshold, the point at which 50% of a human panel can detect the presence of the compound.
- 0.0047 ppm is the recognition threshold, the concentration at which 50% of humans can detect the characteristic odor of hydrogen sulfide, normally described as resembling "a rotten egg".
- OSHA has established a permissible exposure limit (PEL)(8 hour time-weighted average(TWA)) of 10 ppm.
- 10–20 ppm is the borderline concentration for eye irritation.
- 20 ppm is the acceptable ceiling concentration established by OSHA.
- 50 ppm is the acceptable maximum peak above the ceiling concentration for an 8 hour shift, with a maximum duration of 10 minutes.
- 50–100 ppm leads to eye damage.
- At 100–150 ppm the olfactory nerve is paralyzed after a few inhalations, and the sense of smell disappears, often together with awareness of danger.
- 320–530 ppm leads to pulmonary edema with the possibility of death.
- 530–1000 ppm causes strong stimulation of the central nervous system and rapid breathing, leading to loss of breathing.
- 800 ppm is the lethal concentration for 50% of humans for 5 minutes exposure (LC50).
- Concentrations over 1000 ppm cause immediate collapse with loss of breathing, even after inhalation of a single breath.
Function in the body
A hydrogen sulfide bloom (green) stretching for about 150km along the coast of Namibia. As oxygen-poor water reaches the coast, bacteria in the organic-matter rich sediment produce hydrogen sulfide which is toxic to fish. (The image is taken from abird's eye view)
And finally moving on to:
The Lady in Red!
Get Ready for something completely different: Jerry Lee!!!!!!!!!!!!!
...this is brendasue signing off from Rainbow Creek. See You next Time!
Of Course, one more Great Performance!
Hoping You never see a Great Ball of Fire. (Get out of Louisiana FOREVER)