文档介绍：Chemical origin of phosphine in nature
Geng Jinju1*, Zhang Rui1,2 & Wang Xiaorong1
1 State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University,
Nanjing 210093, China;
2 School of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097
* Corresponding author ( E-mail: ******@nju.)

Abstract: Phosphine (PH3) is a natural gaseous carrier of phosphorus in its biogeochemical cycles,
has been found ubiquitously present in the environment. The origin of phosphine in various
environmental sites is still under debated, although phosphine evolution used to be reported from
microbial habitats. The tentative experiments show that phosphine gas could be produced by
aqueous or acid corrosion from phosphorus–containing impurities in iron. The concentration of
phosphine liberated by aqueous corrosion was of the same order of magnitude (ng/kg) as those
detected in natural environment. Acid could accelerate corrosion and promote the production of
phosphine. The quantity of phosphine liberated by mol/L sulfuric acid corrosion was three
magnitude orders (ug/kg) higher than that in aqueous corrosion, which may provide a convincing
explanation for the significant occurrence of phosphine in strong acidic condition (landfill gas,
anaerobic fermentation gas, etc). It was shown that phosphine emission in air as headspace gas
was higher than in nitrogen gas under aqueous corrosion, while different headspace gas (air or
nitrogen gas) showed little effect on phosphine liberation by acid corrosion. Phosphine produced
by reduced type iron powder (analytical reagent) was lower than by technical iron filings. Iron
filings after grinding could enhance the emission of phosphine. Under acid corrosion, an
exponential positive correlation between the weight of iron filings(x, g) and phosphine production
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concentration (y, ng/m3) has been establis