Abstract. 7Be and 210Pb air concentration and depositional flux
data provide key information on the origins and movements of air masses, as
well as atmospheric deposition processes and residence time of aerosols.
After their deposition onto the Earth's surface, they are utilized for
tracing soil redistribution processes on land, particle dynamics in aquatic
systems, and mixing processes in open ocean. Here we present a global dataset
of air concentration and depositional flux measurements of atmospheric
7Be and 210Pb made by a large number of global research
communities. Data were collected from published papers between 1955 and
early 2020. It includes the annual surface air concentration data of
7Be from 367 sites and 210Pb from 270 sites, the annual
depositional flux data of 7Be from 279 sites and 210Pb from
602 sites. When available, appropriate metadata have also been summarized,
including geographic location, sampling date, methodology, annual
precipitation, and references. The dataset is archived at
https://doi.org/10.5281/zenodo.4785136 (Zhang et al., 2021) and is freely
available for the scientific community. The purpose of this paper is to
provide an overview of the scope and nature of this dataset and its
potential utility as baseline data for future research.
Abstract. 7Be and 210Pb air concentration and depositional flux data provide key information on the origins and movements of air masses, as well as deposition processes and residence time of aerosols. After their deposition onto the Earth's surface, they are utilized for tracing soil redistribution processes on land and particle dynamics and mixing processes in the ocean. Here we present a global dataset of air concentration and depositional flux measurements of atmospheric 7Be and 210Pb made by a large number of researchers and laboratories. Data were collected from published papers between 1955 and early 2020. It includes the annual surface air concentrations data of 7Be from 367 sites and of 210Pb from 270 sites, the annual depositional flux of 7Be from 279 sites, and of 210Pb from 602 sites. When available, appropriate metadata have also been summarized, including geographic location, sampling date, methodology, annual precipitation, and references. The dataset is available at https://doi.org/10.5281/zenodo.4521649 (Zhang et al., 2021). The purpose of this paper is to have the published data available in one place for future researchers' public consumption in their research and provide an overview of the scope and nature of this dataset holdings.
Abstract:In this report, the β-CD(AN-co-AA) hydrogel was used to remove the thorium(IV) [Th(IV)] from the water system, and the new adsorbent was characterized through Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The influences of contact time, pH value, ionic strength, solid-liquid ratio, initial Th(IV) concentration, and temperature on Th(IV) adsorption onto the functional hydrogel were researched. The results showed that the experimental data followed the Langmuir isotherm and the maximum adsorption capacity (q max ) for Th(IV) was 692 mg/g at pH 2.95, which approached the calculated (q e ) 682 mg/g. The desorption capacity of Th(IV) in different HNO 3 concentrations ranging from 0.005 to 0.5 M was also studied, and the percentage of the maximum desorption was 86.85% in the condition of 0.09 M HNO 3 . The selectivity of β-CD(AN-co-AA) hydrogel was also be studied, the results indicated that this material retained the good adsorption capacity to Th(IV) even when the Ca 2+ , Mg 2+ , or Pb 2+ existed in the system. The findings indicate that β-CD(AN-co-AA) can be used as a new candidate for the enrichment and separation of Th(IV), or its analogue actinides, from large-volume solution in practical application.
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