Difference between revisions of "Pentachlorophenol"
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Colorless, crystalline powder that was made by the chlorination of [[phenol|phenol]]. Pentachlorophenol (PCP) was used as a [[fungicide|fungicide]], [[bactericide|bactericide]], and [[algicide|algicide]]. It was used commercially for the preservation of [[wood|wood]], [[paper|paper]], [[starch|starch]], [[dextrin|dextrin]], and [[glue|glue]]. When tested as a potential fungicide in a closed container, PCP produced enough [[hydrogen%20chloride|hydrogen chloride]] to corrode [[iron|iron]] fasteners within 24 hours. The sodium salt, sodium pentachlorophenate or PCPNa (Santobrite and Dowicide G), is sometimes used as a replacement to minimize acid formation. Some objects (paper, [[textile|textiles]], [[leather|leather]], and historic wood buildings) may still contain toxic levels of PCP due to its wide use prior to 1987 when its use in the U.S. was banned. | Colorless, crystalline powder that was made by the chlorination of [[phenol|phenol]]. Pentachlorophenol (PCP) was used as a [[fungicide|fungicide]], [[bactericide|bactericide]], and [[algicide|algicide]]. It was used commercially for the preservation of [[wood|wood]], [[paper|paper]], [[starch|starch]], [[dextrin|dextrin]], and [[glue|glue]]. When tested as a potential fungicide in a closed container, PCP produced enough [[hydrogen%20chloride|hydrogen chloride]] to corrode [[iron|iron]] fasteners within 24 hours. The sodium salt, sodium pentachlorophenate or PCPNa (Santobrite and Dowicide G), is sometimes used as a replacement to minimize acid formation. Some objects (paper, [[textile|textiles]], [[leather|leather]], and historic wood buildings) may still contain toxic levels of PCP due to its wide use prior to 1987 when its use in the U.S. was banned. | ||
| − | + | [[[SliderGallery rightalign|pentachlorophenol.jpg~Chemical structure]]] | |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
PCP; Penta; penchlorol; pentachlorphenol; Santophen 20 [Monsanto]; Santobrite (PCPNa) [Monsanto]; Dowicide EC7 [Dow Chemical]; Dowicide G (PCPNa) [Dow Chemical]; Weedone | PCP; Penta; penchlorol; pentachlorphenol; Santophen 20 [Monsanto]; Santobrite (PCPNa) [Monsanto]; Dowicide EC7 [Dow Chemical]; Dowicide G (PCPNa) [Dow Chemical]; Weedone | ||
| − | |||
| − | |||
== Risks == | == Risks == | ||
| − | Toxic by ingestion, inhalation and skin absorption. LD50 = 146=175 mg/kg | + | * Toxic by ingestion, inhalation and skin absorption. LD50 = 146=175 mg/kg |
| − | + | * Can corrode metals. May discolor wood, textiles, and pigments. | |
| − | Can corrode metals. May discolor wood, textiles, and pigments. | + | * Noncombustible. |
| − | + | * Restek: [https://www.restek.com/documentation/msds/31297_useng.pdf SDS] | |
| − | Noncombustible. | ||
| − | |||
| − | Restek: [https://www.restek.com/documentation/msds/31297_useng.pdf SDS] | ||
== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | Needle-like crystals. Soluble in dilute alkali, ethanol, ether, benzene. Slightly soluble in water. | + | * Needle-like crystals. |
| + | * Soluble in dilute alkali, ethanol, ether, benzene. Slightly soluble in water. | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 32: | Line 28: | ||
|- | |- | ||
! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | 190-191 | + | | 190-191 C |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 1.978 | + | | 1.978 g/ml |
|- | |- | ||
! scope="row"| Molecular Weight | ! scope="row"| Molecular Weight | ||
| Line 41: | Line 37: | ||
|- | |- | ||
! scope="row"| Boiling Point | ! scope="row"| Boiling Point | ||
| − | | 309-310 | + | | 309-310 C |
|} | |} | ||
Revision as of 15:52, 17 October 2022
Description
Colorless, crystalline powder that was made by the chlorination of Phenol. Pentachlorophenol (PCP) was used as a Fungicide, Bactericide, and Algicide. It was used commercially for the preservation of Wood, Paper, Starch, Dextrin, and Glue. When tested as a potential fungicide in a closed container, PCP produced enough Hydrogen chloride to corrode Iron fasteners within 24 hours. The sodium salt, sodium pentachlorophenate or PCPNa (Santobrite and Dowicide G), is sometimes used as a replacement to minimize acid formation. Some objects (paper, textiles, Leather, and historic wood buildings) may still contain toxic levels of PCP due to its wide use prior to 1987 when its use in the U.S. was banned.
Synonyms and Related Terms
PCP; Penta; penchlorol; pentachlorphenol; Santophen 20 [Monsanto]; Santobrite (PCPNa) [Monsanto]; Dowicide EC7 [Dow Chemical]; Dowicide G (PCPNa) [Dow Chemical]; Weedone
Risks
- Toxic by ingestion, inhalation and skin absorption. LD50 = 146=175 mg/kg
- Can corrode metals. May discolor wood, textiles, and pigments.
- Noncombustible.
- Restek: SDS
Physical and Chemical Properties
- Needle-like crystals.
- Soluble in dilute alkali, ethanol, ether, benzene. Slightly soluble in water.
| Composition | C6Cl5OH |
|---|---|
| CAS | 87-86-5 |
| Melting Point | 190-191 C |
| Density | 1.978 g/ml |
| Molecular Weight | mol. wt.=266.4 |
| Boiling Point | 309-310 C |
Resources and Citations
- Lynda A. Zycherman, J.Richard Schrock, A Guide to Museum Pest Control, FAIC and Association of Systematics Collections, Washington DC, 1988
- G.Caneva, M.P.Nugari, O.Salvadori, Biology in the Conservation of Works of Art, ICCROM, Rome, 1991
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7242
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 413
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
- Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002
- Wikipedia: http://en.wikipedia.org/wiki/Pentachlorophenol (Accessed Feb. 10, 2006)