Français
Deutsch
Español
Italiano
Português
日本語
한국어
Русский
Nitrates: Are they unhealthy or protective?
Jun 29, 2023Assimilatory sulfate reduction in the marine methanogen Methanothermococcus thermolithotrophicus
Jul 29, 2023A metal
Jan 03, 2024Doctor Says Listening to Metal Lessens Stress, Promotes Thinking
May 15, 2023Gastroenterologists Recommend 2 New Treatments for Chronic Constipation
May 01, 2023Plants Leave Chemical Fingerprints on an Ozone
Mar 26, 2023Methyl chloride (CH3Cl) is one of the most common chlorine-based gases in Earth's atmosphere. Along with related chemicals, it depletes the ozone layer, exposing life on the planet to more of the Sun's ultraviolet radiation. The sources and processes that emit the gas and remove it from the atmosphere are still unclear.
Get the most fascinating science news stories of the week in your inbox every Friday.
In a new study, Hartmann et al. discovered that plants called royal ferns (Osmunda regalis) emit methyl chloride with an isotopic composition different from that emitted by industrial sources. Isotopes are different forms of the same chemical element with varying numbers of neutrons. Their analysis also revealed that another plant, called club moss, breaks down methyl chloride using an as yet undiscovered mechanism. Isotope analysis, they say, could help elucidate the distribution of the gas's origins and removal.
The researchers first investigated methyl chloride production by the royal fern, which is common in temperate and subtropical regions and emits large amounts of methyl chloride. They collected and analyzed samples of royal ferns in a botanical garden in Germany.
They found that the proportions of carbon, hydrogen, and chlorine isotopes in methyl chloride produced by the royal ferns differed significantly from those produced by industrially manufactured methyl chloride.
Next, the researchers analyzed the isotopic composition of methyl chloride when it is broken down by club moss (Selaginella kraussiana). They discovered a unique isotopic pattern that differs from those produced by other methyl chloride–degrading plants, suggesting that club moss uses an unknown mechanism to process the gas.
These chemical fingerprints, the researchers say, could be used in future research to clarify inputs and removals of methyl chloride in the atmosphere. (Journal of Geophysical Research: Biogeosciences, https://doi.org/10.1029/2022JG007256, 2023)
—Sarah Stanley, Science Writer
Citation: