Field-Scale Heterogeneity and Geochemical Regulation of Arsenic, Iron, Lead, and Sulfur Bioavailability in Paddy Soil
PBN-AR
Instytucja
Wydział Geodezji i Kartografii (Politechnika Warszawska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Environmental Science & Technology (45pkt w roku publikacji)
ISSN
0013-936X
EISSN
Wydawca
DOI
URL
Rok publikacji
2018
Numer zeszytu
21
Strony od-do
12098-12107
Numer tomu
52
Identyfikator DOI
Liczba arkuszy
0.5
Autorzy
(liczba autorów: 8)
Pozostali autorzy
+ 7
Streszczenia
Język
en
Treść
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.
Inne
System-identifier
WUTda6899ac6a554275a5c6ce409e6c6bd5
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