Abstract
Inorganic arsenic (As) pesticides have been widely used for decades in many countries. However, insufficient data are available on the chemical speciation of inorganic arsenicals in tropical paddy soils. Inorganic As-containing pesticides were used in tropical countries, a few decades ago, however, their fate have not been studied. Hence, the objective of this study was to determine fractionation of inorganic arsenicals and to assess As lability with/without fertilizer application using a static incubation experiment. Eight soils from wet and dry regions of Sri Lanka were amended with 1,000 mg/kg arsenate for this purpose. The FT-IR and XRF results suggested that soils in the wet region were rich in Fe/Al-oxides. Paddy soils in the dry zone showed high As lability. These low-humic gley soils have low Fe/Al oxyhydroxide and alkaline pH. In contrast, the wet zone had soils with higher As retention capacity, high amounts of Fe/Al oxyhydroxide, and acidic pH. Arsenic lability increased considerably 30 days after fertilizer application. Overall, As lability was mainly influenced by soil mineralogical and chemical properties, i.e., Fe/Al oxyhydroxide, pH, organic matter, and fertilizer application.
| Original language | English |
|---|---|
| Pages (from-to) | 837-847 |
| Number of pages | 11 |
| Journal | Environmental Earth Sciences |
| Volume | 71 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2014 Jan 1 |
| Externally published | Yes |
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Keywords
- Chemical speciation
- Fe/Al oxyhydroxide
- Fertilizer
- Organic matter
- Tropical paddy soils
ASJC Scopus subject areas
- Global and Planetary Change
- Environmental Chemistry
- Water Science and Technology
- Soil Science
- Pollution
- Geology
- Earth-Surface Processes
Cite this
Effects of soil type and fertilizer on As speciation in rice paddy contaminated with As-containing pesticide. / Vithanage, Meththika; Rajapaksha, Anushka Upamali; Wijesekara, Hasintha; Weerarathne, N.; Ok, Yong Sik.
In: Environmental Earth Sciences, Vol. 71, No. 2, 01.01.2014, p. 837-847.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of soil type and fertilizer on As speciation in rice paddy contaminated with As-containing pesticide
AU - Vithanage, Meththika
AU - Rajapaksha, Anushka Upamali
AU - Wijesekara, Hasintha
AU - Weerarathne, N.
AU - Ok, Yong Sik
PY - 2014/1/1
Y1 - 2014/1/1
N2 - Inorganic arsenic (As) pesticides have been widely used for decades in many countries. However, insufficient data are available on the chemical speciation of inorganic arsenicals in tropical paddy soils. Inorganic As-containing pesticides were used in tropical countries, a few decades ago, however, their fate have not been studied. Hence, the objective of this study was to determine fractionation of inorganic arsenicals and to assess As lability with/without fertilizer application using a static incubation experiment. Eight soils from wet and dry regions of Sri Lanka were amended with 1,000 mg/kg arsenate for this purpose. The FT-IR and XRF results suggested that soils in the wet region were rich in Fe/Al-oxides. Paddy soils in the dry zone showed high As lability. These low-humic gley soils have low Fe/Al oxyhydroxide and alkaline pH. In contrast, the wet zone had soils with higher As retention capacity, high amounts of Fe/Al oxyhydroxide, and acidic pH. Arsenic lability increased considerably 30 days after fertilizer application. Overall, As lability was mainly influenced by soil mineralogical and chemical properties, i.e., Fe/Al oxyhydroxide, pH, organic matter, and fertilizer application.
AB - Inorganic arsenic (As) pesticides have been widely used for decades in many countries. However, insufficient data are available on the chemical speciation of inorganic arsenicals in tropical paddy soils. Inorganic As-containing pesticides were used in tropical countries, a few decades ago, however, their fate have not been studied. Hence, the objective of this study was to determine fractionation of inorganic arsenicals and to assess As lability with/without fertilizer application using a static incubation experiment. Eight soils from wet and dry regions of Sri Lanka were amended with 1,000 mg/kg arsenate for this purpose. The FT-IR and XRF results suggested that soils in the wet region were rich in Fe/Al-oxides. Paddy soils in the dry zone showed high As lability. These low-humic gley soils have low Fe/Al oxyhydroxide and alkaline pH. In contrast, the wet zone had soils with higher As retention capacity, high amounts of Fe/Al oxyhydroxide, and acidic pH. Arsenic lability increased considerably 30 days after fertilizer application. Overall, As lability was mainly influenced by soil mineralogical and chemical properties, i.e., Fe/Al oxyhydroxide, pH, organic matter, and fertilizer application.
KW - Chemical speciation
KW - Fe/Al oxyhydroxide
KW - Fertilizer
KW - Organic matter
KW - Tropical paddy soils
UR - http://www.scopus.com/inward/record.url?scp=84927123712&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84927123712&partnerID=8YFLogxK
U2 - 10.1007/s12665-013-2486-9
DO - 10.1007/s12665-013-2486-9
M3 - Article
AN - SCOPUS:84927123712
VL - 71
SP - 837
EP - 847
JO - Environmental Earth Sciences
JF - Environmental Earth Sciences
SN - 1866-6280
IS - 2
ER -