Abstract
Insufficient information exists about the speciation of arsenic leaching from in-service chromated copper arsenate (CCA)-treated products and the overall impact to soils and groundwater. To address this issue, two decks were constructed, one from CCA-treated wood and the other from untreated wood. Both decks were placed in the open environment where they were impacted by rainfall. Over a one-year period, rainwater runoff from the decks and rainwater infiltrating through 0.7 m of sand below the decks was collected and analyzed for arsenic species by HPLC-ICP-MS. The average arsenic concentration in the runoff of the untreated deck was 2-3 μg/L, whereas from the CCA-treated deck it was 600 μg/L Both inorganic As(III) and As(V) were detected in the runoff from both decks, with inorganic As(V) predominating. No detectable levels of organoarsenic species were observed. The total arsenic concentration in the infiltrated water of the treated deck had risen from a background concentration of 3 μg/L to a concentration of 18 μg/L at the end of the study. Data from the deck study were combined with annual CCA-treated wood production statistics to develop a mass balance model to estimate the extent of arsenic leaching from in-service CCA-treated wood structures to Florida soils. Results showed that during the year 2000, of the 28 000 t of arsenic imported into the state and utilized for in-service CCA-treated wood products, approximately 4600 t had already leached. Future projections suggest that an additional 11 000 t of arsenic will leach during in-service use within the next 40 years.
| Original language | English |
|---|---|
| Pages (from-to) | 988-993 |
| Number of pages | 6 |
| Journal | Environmental Science and Technology |
| Volume | 40 |
| Issue number | 3 |
| DOIs | |
| State | Published - Feb 1 2006 |
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ASJC Scopus subject areas
- Environmental Engineering
- Environmental Science(all)
- Environmental Chemistry
Cite this
Release of arsenic to the environment from CCA-treated wood. 1. Leaching and speciation during service. / Khan, Bernine I.; Solo-Gabriele, Helena M; Townsend, Timothy G.; Cai, Yong.
In: Environmental Science and Technology, Vol. 40, No. 3, 01.02.2006, p. 988-993.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Release of arsenic to the environment from CCA-treated wood. 1. Leaching and speciation during service
AU - Khan, Bernine I.
AU - Solo-Gabriele, Helena M
AU - Townsend, Timothy G.
AU - Cai, Yong
PY - 2006/2/1
Y1 - 2006/2/1
N2 - Insufficient information exists about the speciation of arsenic leaching from in-service chromated copper arsenate (CCA)-treated products and the overall impact to soils and groundwater. To address this issue, two decks were constructed, one from CCA-treated wood and the other from untreated wood. Both decks were placed in the open environment where they were impacted by rainfall. Over a one-year period, rainwater runoff from the decks and rainwater infiltrating through 0.7 m of sand below the decks was collected and analyzed for arsenic species by HPLC-ICP-MS. The average arsenic concentration in the runoff of the untreated deck was 2-3 μg/L, whereas from the CCA-treated deck it was 600 μg/L Both inorganic As(III) and As(V) were detected in the runoff from both decks, with inorganic As(V) predominating. No detectable levels of organoarsenic species were observed. The total arsenic concentration in the infiltrated water of the treated deck had risen from a background concentration of 3 μg/L to a concentration of 18 μg/L at the end of the study. Data from the deck study were combined with annual CCA-treated wood production statistics to develop a mass balance model to estimate the extent of arsenic leaching from in-service CCA-treated wood structures to Florida soils. Results showed that during the year 2000, of the 28 000 t of arsenic imported into the state and utilized for in-service CCA-treated wood products, approximately 4600 t had already leached. Future projections suggest that an additional 11 000 t of arsenic will leach during in-service use within the next 40 years.
AB - Insufficient information exists about the speciation of arsenic leaching from in-service chromated copper arsenate (CCA)-treated products and the overall impact to soils and groundwater. To address this issue, two decks were constructed, one from CCA-treated wood and the other from untreated wood. Both decks were placed in the open environment where they were impacted by rainfall. Over a one-year period, rainwater runoff from the decks and rainwater infiltrating through 0.7 m of sand below the decks was collected and analyzed for arsenic species by HPLC-ICP-MS. The average arsenic concentration in the runoff of the untreated deck was 2-3 μg/L, whereas from the CCA-treated deck it was 600 μg/L Both inorganic As(III) and As(V) were detected in the runoff from both decks, with inorganic As(V) predominating. No detectable levels of organoarsenic species were observed. The total arsenic concentration in the infiltrated water of the treated deck had risen from a background concentration of 3 μg/L to a concentration of 18 μg/L at the end of the study. Data from the deck study were combined with annual CCA-treated wood production statistics to develop a mass balance model to estimate the extent of arsenic leaching from in-service CCA-treated wood structures to Florida soils. Results showed that during the year 2000, of the 28 000 t of arsenic imported into the state and utilized for in-service CCA-treated wood products, approximately 4600 t had already leached. Future projections suggest that an additional 11 000 t of arsenic will leach during in-service use within the next 40 years.
UR - http://www.scopus.com/inward/record.url?scp=32344438820&partnerID=8YFLogxK
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U2 - 10.1021/es0514702
DO - 10.1021/es0514702
M3 - Article
VL - 40
SP - 988
EP - 993
JO - Environmental Science & Technology
JF - Environmental Science & Technology
SN - 0013-936X
IS - 3
ER -