Leaching of Wood Preservative Components and Their Mobility in the Environment PDF Download
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Author: Stan Lebow
Publisher:
ISBN:
Category : Leaching
Languages : en
Pages : 40
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Book Description
Author: Stan Lebow
Publisher:
ISBN:
Category : Leaching
Languages : en
Pages : 40
Get Book Here
Book Description
Author: Stan T. Lebow
Publisher:
ISBN:
Category : Leaching
Languages : en
Pages : 36
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Book Description
Preservative-treated wood is an economical, durable, and aesthetically pleasing building material; therefore, it is a natural choice for construction projects in our National Forests, National Parks, and other public lands. However, we need to ensure that the chemicals used in treated wood do not pose a threat to people or the environment. The purpose of this report is to provide a summary of the pertinent literature on leaching of wood preservative components and their mobility in the environment. The waterborne wood preservatives chromated copper arsenate (CCA), ammoniacal copper zinc arsenate (ACZA), ammoniacal copper quat (ACQ), copper dimethyldithiocarbamate (CDDC), and ammoniacal copper citrate (CC) resist leaching during service because of complex chemical reactions that take place within the treated wood. The effectiveness of these reactions in preventing leaching is dependent on treating factors, such as preservative formulation, preservative retention, and processing techniques, as well as post-treatment conditioning factors, such as temperature, humidity, and air flow. Copper naphthenate, an oilborne wood preservative, resists leaching because it is relatively insoluble in water. Little information is available on the inservice leaching rates of any of these wood preservatives, although CCA has been studied more extensively than the other preservatives. Past studies report widely varying leaching rates, but generally agree that the most rapid leaching occurs within the first months of service and is greatest in products with high retention levels and high proportions of exposed surface area, especially end-grain. Leaching is also increased by exposing the wood to high water flow, low pH, and water-soluble organic acids. Movement of leached chromium and copper appears quite limited in soil, because the metals are tightly bound to organic soil constituents. Arsenic is slightly more mobile in soil, but binds to iron, aluminum, and manganese. Generally, the preservative components are least mobile in organic soils, slightly more mobile in clay soils, and most mobile in sandy soils. In aquatic applications, the leached preservative components form complexes with the organic sediment fines, and accordingly are either deposited or moved downstream with the sediments. Additional research is needed to characterize typical in-service leaching rates of these preservatives and to determine how processing parameters affect long-term leaching rates. Keywords: wood preservatives, leaching, in service, CCA, ACZA, ACQ, CDDC, CC, copper napthenate.
Author:
Publisher:
ISBN:
Category : Wood preservatives
Languages : en
Pages : 134
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Book Description
Author: Timothy G. Townsend
Publisher: CRC Press
ISBN: 1420006215
Category : Science
Languages : en
Pages : 521
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Book Description
Responding to a heightened awareness of the possible adverse effect of treated wood, this book presents multidisciplinary research results and fundamental information on regulations, wood treatment alternatives, and documentation of environmental releases. It examines the impact of treated wood on water, soil, and organisms. Several chapters discuss ways to measure exposure and review various approaches to risk assessment and management. Case studies address human health effects of exposure. The book also presents state-of-the-art disposal technologies, new preservative compounds, and recent developments related to phase outs of certain treated wood products.
Author:
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 672
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Author:
Publisher: UCANR Publications
ISBN: 1601073070
Category :
Languages : en
Pages : 8
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Author: James Scott Groenier
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 52
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Author: C. A. Brebbia
Publisher: WIT Press
ISBN: 1845646045
Category : Business & Economics
Languages : en
Pages : 661
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Book Description
"The interdisciplinary conference addressed some of the most serious problems affecting sustainable development, issues that must be considered by development projects in order to provide complete solutions. A major motivation for the meeting was to learn from past failures and avoid repeating similar mistakes while attempting to prevent emerging threats to the environmental and ecological systems by developing more constructive and progressive approaches to ensure sustainability"--Publisher information.
Author:
Publisher:
ISBN:
Category : Leaching
Languages : en
Pages : 8
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Author:
Publisher:
ISBN:
Category : Environmental chemistry
Languages : en
Pages : 834
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