Phosphorus Speciation in Atmospherically Deposited Particulate Matter and Implications for Terrestrial Ecosystem Productivity.,Environmental Science & Technology

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Phosphorus Speciation in Atmospherically Deposited Particulate Matter and Implications for Terrestrial Ecosystem Productivity.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-03-30 , DOI: 10.1021/acs.est.9b06150
Peggy A O'Day ₁ , Ugwumsinachi G Nwosu ₁ , Morgan E Barnes ₂ , Stephen C Hart ₁ , Asmeret Asefaw Berhe ₁ , John N Christensen ₃ , Kenneth H Williams _{3,

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Affiliation

Chemical forms of phosphorus (P) in airborne particulate matter (PM) are poorly known and do not correlate with solubility or extraction measurements commonly used to infer speciation. We used P X-ray absorption near-edge structure (XANES) and 31P nuclear magnetic resonance (NMR) spectroscopies to determine P species in PM collected at four mountain sites (Colorado and California). Organic P species dominated samples from high elevations, with organic P estimated at 65-100% of total P in bulk samples by XANES and 79-88% in extracted fractions (62-84% of total P) by NMR regardless of particle size (≥10 or 1-10 μm). Phosphorus monoester and diester organic species were dominant and present in about equal proportions, with low fractions of inorganic P species. By comparison, PM from low elevation contained mixtures of organic and inorganic P, with organic P estimated at 30-60% of total P. Intercontinental PM transport determined from radiogenic lead (Pb) isotopes varied from 0 to 59% (mean 37%) Asian-sourced Pb at high elevation, whereas stronger regional PM inputs were found at low elevation. Airborne flux of bioavailable P to high-elevation ecosystems may be twice as high as estimated by global models, which will disproportionately affect net primary productivity.

中文翻译：

大气沉积颗粒物中的磷形态及其对陆地生态系统生产力的影响。

空气中的颗粒物（PM）中磷（P）的化学形式鲜为人知，并且与通常用于推断形态的溶解度或提取测量值无关。我们使用P X射线吸收近边缘结构（XANES）和31P核磁共振（NMR）光谱仪确定了在四个山区（科罗拉多州和加利福尼亚州）收集的PM中的P物质。有机磷物质在高海拔地区占主导地位，根据XANES估计，有机磷占散装样品中总磷的65-100％，而根据NMR估算，提取出的馏分中总磷占79-8％（占总磷的62-84％），而与粒径无关（ ≥10或1-10μm）。磷一酯和二酯有机物占主导地位，并以大约相等的比例存在，而无机P物质的比例较低。相比之下，低海拔的PM含有有机和无机P的混合物，有机磷估计占总P的30-60％。高放射性地区从放射性铅（Pb）同位素确定的洲际PM迁移量在0到59％（平均37％）之间变化，而高浓度的区域PM输入被发现在低海拔。高海拔生态系统的生物利用磷在空气中的通量可能是全球模型估计值的两倍，这将对净初级生产力产生不成比例的影响。

更新日期：2020-04-23

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