Field-Scale Heterogeneity and Geochemical Regulation of Arsenic, Iron, Lead, and Sulfur Bioavailability in Paddy Soil

Wen Fang , Paul N. Williams , Xu Fang , Collins Amoah-Antwi , Daixia Yin , Gang Li , Lena Q. Ma , Jun Luo


A method using miniaturized arrayed DGT-probes (PADDI) for high-frequency in situ sampling with LA-ICPMS and CID analysis was developed to measure the field-scale heterogeneity of trace-element bioavailability. Robust calibrations (R2 > 0.99) combined with high-sensitivity (LOD = 0.35 ng cm–2), multielemental detection, and short measurement times were achieved using a new LA-ICPMS microDGT analysis. In the studied paddy-site (size: ∼2500 m2), total element concentrations across the field were approximately uniform (R.S.D. < 10%), but bioavailability was shown to vary significantly as determined from 864 microgel measurements housed within 72 PADDI arrays. Porewater As measurements were unable to differentiate the top/rhizosphere and bulk/deeper-soil layers. However, dynamic sampling with DGT revealed significant differences. Heterogeneity behaviors varied greatly between the different elements. Arsenic bioavailability was stable laterally across the field, but varied with depth, which was in contrast to the trends for Pb. Fe/S(−II) change was bidirectional, differing horizontally and vertically throughout the field. The heterogeneity in Pb bioavailability, due to the high frequency of hotspot maxima that were discretely dispersed across the paddy, proved the most difficult to simulate requiring the greatest number of probe deployments to determine a reliable field-average. The DGT-PADDI system provides a new characterization of infield trends for improved trace-inorganics’ management in agricultural wetlands.
Author Wen Fang
Wen Fang,,
, Paul N. Williams
Paul N. Williams,,
, Xu Fang
Xu Fang,,
, Collins Amoah-Antwi (FGC / CSMES)
Collins Amoah-Antwi,,
- Chair of Spatial Management and Environmental Science
, Daixia Yin
Daixia Yin,,
, Gang Li
Gang Li,,
, Lena Q. Ma
Lena Q. Ma,,
, Jun Luo
Jun Luo,,
Journal seriesEnvironmental Science & Technology, ISSN 0013-936X
Issue year2018
Publication size in sheets0.5
ASJC Classification1600 General Chemistry; 2304 Environmental Chemistry
Internal identifier90/2018
Languageen angielski
Field-Scale Heterogeneity Collins Amoah-Antwi 90 2018.pdf 3.85 MB
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90-2018 Oswiadczenie Collins Aoath-Antwi.pdf 933.59 KB
Score (nominal)45
Score sourcejournalList
ScoreMinisterial score = 45.0, 16-06-2020, ArticleFromJournal
Publication indicators Scopus Citations = 7; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.959; WoS Impact Factor: 2018 = 7.149 (2) - 2018=7.874 (5)
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