Arsenic leaching from mulch made from recycled construction and demolition wood and impacts of iron-oxide colorants

Tomoyuki Shibata, Helena M Solo-Gabriele, Brajesh Dubey, Timothy G. Townsend, Gary A. Jacobi

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Mulch made from recycled construction and demolition (C&D) wood has been reported to contain elevated levels of arsenic from inadvertent inclusion of chromated copper arsenate (CCA)-treated wood. Such mulch is also commonly colored with iron oxide, a compound known to bind arsenic. The objectives of this study were to quantify the releases of arsenic from mulch made from C&D wood, to evaluate the impacts of an iron-oxide colorant in potentially decreasing arsenic leaching rates, and to evaluate the relative significance of additional variables on leachate concentrations. A total of 3 sets of mulch samples (0%, 5%, or 100% CCA-treated wood) were prepared containing a sample either with or without colorant addition. Each sample was subjected to two tests: a field leaching test and the Synthetic Precipitation Leaching Procedure (SPLP). Results showed that arsenic concentrations in the field leachate from the 0% treated wood mulches were consistently low (<0.003-0.013 mg/L) whereas leachates from 5 and 100% treated wood mulches were characterized by higher arsenic concentrations (0.059-2.23 mg/L for 5%; 0.711-22.7 mg/L for 100%). The mass of arsenic leached from the field samples during the 1-year monitoring period was between 10 and 15% of the initial mass of arsenic. The colorant reduced the leaching of arsenic by more than 20% for the field leachate and 50% for the SPLP leachate, on average. However, the study showed that the effect may not last for long periods. Besides colorant addition other factors were observed to affect the amount of arsenic leached from contaminated mulch. These include the proportion of CCA-treated wood in the mulch, time, and pH of rainfall.

Original languageEnglish
Pages (from-to)5102-5107
Number of pages6
JournalEnvironmental Science and Technology
Volume40
Issue number16
DOIs
StatePublished - Aug 15 2006

Fingerprint

Demolition
demolition
mulch
Arsenic
Iron oxides
iron oxide
Leaching
arsenic
Wood
leaching
leachate
arsenate
copper
Copper
ferric oxide
Rain

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Arsenic leaching from mulch made from recycled construction and demolition wood and impacts of iron-oxide colorants. / Shibata, Tomoyuki; Solo-Gabriele, Helena M; Dubey, Brajesh; Townsend, Timothy G.; Jacobi, Gary A.

In: Environmental Science and Technology, Vol. 40, No. 16, 15.08.2006, p. 5102-5107.

Research output: Contribution to journalArticle

Shibata, Tomoyuki ; Solo-Gabriele, Helena M ; Dubey, Brajesh ; Townsend, Timothy G. ; Jacobi, Gary A. / Arsenic leaching from mulch made from recycled construction and demolition wood and impacts of iron-oxide colorants. In: Environmental Science and Technology. 2006 ; Vol. 40, No. 16. pp. 5102-5107.
@article{659275c4019a43edaa752e2db31734ae,
title = "Arsenic leaching from mulch made from recycled construction and demolition wood and impacts of iron-oxide colorants",
abstract = "Mulch made from recycled construction and demolition (C&D) wood has been reported to contain elevated levels of arsenic from inadvertent inclusion of chromated copper arsenate (CCA)-treated wood. Such mulch is also commonly colored with iron oxide, a compound known to bind arsenic. The objectives of this study were to quantify the releases of arsenic from mulch made from C&D wood, to evaluate the impacts of an iron-oxide colorant in potentially decreasing arsenic leaching rates, and to evaluate the relative significance of additional variables on leachate concentrations. A total of 3 sets of mulch samples (0{\%}, 5{\%}, or 100{\%} CCA-treated wood) were prepared containing a sample either with or without colorant addition. Each sample was subjected to two tests: a field leaching test and the Synthetic Precipitation Leaching Procedure (SPLP). Results showed that arsenic concentrations in the field leachate from the 0{\%} treated wood mulches were consistently low (<0.003-0.013 mg/L) whereas leachates from 5 and 100{\%} treated wood mulches were characterized by higher arsenic concentrations (0.059-2.23 mg/L for 5{\%}; 0.711-22.7 mg/L for 100{\%}). The mass of arsenic leached from the field samples during the 1-year monitoring period was between 10 and 15{\%} of the initial mass of arsenic. The colorant reduced the leaching of arsenic by more than 20{\%} for the field leachate and 50{\%} for the SPLP leachate, on average. However, the study showed that the effect may not last for long periods. Besides colorant addition other factors were observed to affect the amount of arsenic leached from contaminated mulch. These include the proportion of CCA-treated wood in the mulch, time, and pH of rainfall.",
author = "Tomoyuki Shibata and Solo-Gabriele, {Helena M} and Brajesh Dubey and Townsend, {Timothy G.} and Jacobi, {Gary A.}",
year = "2006",
month = "8",
day = "15",
doi = "10.1021/es060623y",
language = "English",
volume = "40",
pages = "5102--5107",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "16",

}

TY - JOUR

T1 - Arsenic leaching from mulch made from recycled construction and demolition wood and impacts of iron-oxide colorants

AU - Shibata, Tomoyuki

AU - Solo-Gabriele, Helena M

AU - Dubey, Brajesh

AU - Townsend, Timothy G.

AU - Jacobi, Gary A.

PY - 2006/8/15

Y1 - 2006/8/15

N2 - Mulch made from recycled construction and demolition (C&D) wood has been reported to contain elevated levels of arsenic from inadvertent inclusion of chromated copper arsenate (CCA)-treated wood. Such mulch is also commonly colored with iron oxide, a compound known to bind arsenic. The objectives of this study were to quantify the releases of arsenic from mulch made from C&D wood, to evaluate the impacts of an iron-oxide colorant in potentially decreasing arsenic leaching rates, and to evaluate the relative significance of additional variables on leachate concentrations. A total of 3 sets of mulch samples (0%, 5%, or 100% CCA-treated wood) were prepared containing a sample either with or without colorant addition. Each sample was subjected to two tests: a field leaching test and the Synthetic Precipitation Leaching Procedure (SPLP). Results showed that arsenic concentrations in the field leachate from the 0% treated wood mulches were consistently low (<0.003-0.013 mg/L) whereas leachates from 5 and 100% treated wood mulches were characterized by higher arsenic concentrations (0.059-2.23 mg/L for 5%; 0.711-22.7 mg/L for 100%). The mass of arsenic leached from the field samples during the 1-year monitoring period was between 10 and 15% of the initial mass of arsenic. The colorant reduced the leaching of arsenic by more than 20% for the field leachate and 50% for the SPLP leachate, on average. However, the study showed that the effect may not last for long periods. Besides colorant addition other factors were observed to affect the amount of arsenic leached from contaminated mulch. These include the proportion of CCA-treated wood in the mulch, time, and pH of rainfall.

AB - Mulch made from recycled construction and demolition (C&D) wood has been reported to contain elevated levels of arsenic from inadvertent inclusion of chromated copper arsenate (CCA)-treated wood. Such mulch is also commonly colored with iron oxide, a compound known to bind arsenic. The objectives of this study were to quantify the releases of arsenic from mulch made from C&D wood, to evaluate the impacts of an iron-oxide colorant in potentially decreasing arsenic leaching rates, and to evaluate the relative significance of additional variables on leachate concentrations. A total of 3 sets of mulch samples (0%, 5%, or 100% CCA-treated wood) were prepared containing a sample either with or without colorant addition. Each sample was subjected to two tests: a field leaching test and the Synthetic Precipitation Leaching Procedure (SPLP). Results showed that arsenic concentrations in the field leachate from the 0% treated wood mulches were consistently low (<0.003-0.013 mg/L) whereas leachates from 5 and 100% treated wood mulches were characterized by higher arsenic concentrations (0.059-2.23 mg/L for 5%; 0.711-22.7 mg/L for 100%). The mass of arsenic leached from the field samples during the 1-year monitoring period was between 10 and 15% of the initial mass of arsenic. The colorant reduced the leaching of arsenic by more than 20% for the field leachate and 50% for the SPLP leachate, on average. However, the study showed that the effect may not last for long periods. Besides colorant addition other factors were observed to affect the amount of arsenic leached from contaminated mulch. These include the proportion of CCA-treated wood in the mulch, time, and pH of rainfall.

UR - http://www.scopus.com/inward/record.url?scp=33747618272&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33747618272&partnerID=8YFLogxK

U2 - 10.1021/es060623y

DO - 10.1021/es060623y

M3 - Article

C2 - 16955914

AN - SCOPUS:33747618272

VL - 40

SP - 5102

EP - 5107

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

IS - 16

ER -