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==Health and Environmental Hazards== |
==Health and Environmental Hazards== |
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Nonylphenol is considered to be an [[endocrine disruptor]] due to weak ability to mimic estrogen and in turn disrupt the natural balance of hormones in affected organisms.<ref>"Review article: Nonylphenol in the environment: A critical review on occurrence, fate, toxicity and treatment in wastewaters" A. Soares, B. Guieysse, B. Jefferson, E. Cartmell, J.N. Lester Environment International 2008, Volume 34, Pages 1033-1049. {{DOI|10.1016/j.envint.2008.01.004}} PMID 18282600</ref><ref>Minnesota Pollution Control Agency Statewide Endocrine Disrupting Compound Monitoring Study, 2007 - 2008</ref><ref>[http://www.ewg.org/sites/humantoxome/chemicals/chemical.php?chemid=100371 Nonylphenol], [[Environmental Working Group]]</ref> The effect is weak because nonylphenols are not very close structural mimics of estradiol, but the levels of nonylphenol can be sufficiently high to compensate. |
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[[Image:NonylphenolEstradiol.png|thumb|350px|left|Structure of the hormone estradiol and one of the nonylphenols.]] |
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=== Environmental Hazards=== |
=== Environmental Hazards=== |
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Revision as of 18:33, 13 March 2014
OliviaHall10 (talk) 21:09, 19 February 2014 (UTC)
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| Names | |
|---|---|
| IUPAC name
4-(2,4-dimethylheptan-3-yl)phenol
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| Other names
Phenol, nonyl-
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| Identifiers | |
3D model (JSmol)
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| ChEMBL | |
| ChemSpider | |
PubChem CID
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| Properties | |
| C15H24O | |
| Molar mass | 220.35 g/mol |
| Appearance | Light yellow viscous liquid with phenolic smell [1] |
| Density | 0.953 |
| Melting point | −8 – 2 °C |
| Boiling point | 293 to 297 °C |
| 6 mg/L (pH 7) | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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low level endrocrine disruptor |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Nonylphenol is a family of closely related organic compounds, a subset of the alkylphenols. This collection of compounds is a precursor to commercially important detergents, nonylphenol ethoxylates. Nonylphenol features both polar and hydrophobic subunits, the phenol and the hydrocarbon tail.
Chemical Structure and Basic Properties
Nonylphenols fall into the general chemical category of alkylphenols. Another alkylphenol is Bisphenol-A, which is found in plastic water bottles. [2] The structure of NPs may vary. The nonyl group can be attached to the phenol ring at various locations, usually the 4- and, to lesser extent, the 2-positions, and can be either branched or linear. A branched nonylphenol, 4-nonylphenol, is the most widely produced and marketed nonylphenol. [3] The mixture of nonylphenol isomers is a pale yellow liquid, although the pure compounds are colorless. The nonylphenols are moderatley soluble in water [3] but soluble in alcohol.
Nonylphenol arises from the degradation of Nonylphenol ethoxylates in the environment. Nonylphenol ethoxylates fall into the general chemical category of alkylphenol ethoxylates (APEs). NPEs are a clear to light orange color liquid. Nonylphenol ethoxylates are nonionic in water, which means that they have no charge. Because of this property they are used as detergents, cleaners, emulsifiers, and a variety of other applications. They are amphipathic, in that they are hydrophilic and hydrophobic, which allows them to surround non-polar substances like oil and grease, isolating them them from water. [4]
Production
Nonylphenols are produced by acid-catalyzed alkylation of phenol with a mixture of nonenes. To make NPEs manufacturer's react NP with ethlylene oxide under basic conditions. [3] Approximately 100 to 500 millions pounds of nonylphenol are produced anualy, based on the most widely produced nonylphenols[3][5] Nonylphenol is produced naturally as a component of the defensive slime released by the velvet worm. The nonylphenol lines the ejection channel of the slime, stopping it from sticking to the organism when it is secreted. It also prolongs the drying process long enough for the slime to reach its target.[6]This is the only organism known to produce nonylphenol [6].
Applications and Uses
Nonylphenol is used in manufacturing antiooxidants, lubricating oil additives and the production of NPEs. Nonylphenol exthoxylates have a variety of industrial and household uses including detergents, emulsifiers, wetting and dispersing agents, antistatic agents, demulsifiers and solubilisers. [4] APEs are a component of some household detergents outside of Europe. In Europe, due to environmental concerns, they have been replaced by more expensive alcohol ethoxylates, which are less problematic environmentally.
Another surfactant and APE nonoxynol, which was once used as intravaginal spermicide and condom lubricant was found to metabolize into free nonylphenol when administered to lab animals. [2] Nonoxynol-9 is also used as a surfactant in cleaning and cosmetic products.[4]
Occurrence in the environment
Many products that contain nonylphenol and nonylphenol ethoxylates have "down-the-drain" applications, such as laundry detergents, so the contaminants are frequently introduced into the water supply. The water goes into sewage treatment plants, where nonylphenol ethoxylate is able to degrade into nonylphenol and contaminate aquatic environments. Nonylphenol is found in river water and sediments as well as soil and groundwater. In surface water, the concentration of nonylphenol decreases due to photolysis induced by sunlight, but in sediment it is estimated that is has a half life of mare than 60 years. [4] Due to its low solubility, it is found in higher concentrations in sediment versus in water.
The occurrence of nonylphenol in soil is not as well studied as it is in aquatic environments, but the major concern is that contaminated sewage sludge is frequently recycled into agricultural land. There are many factors that influence the degradation of nonylphenol in soil including the depth of the sludge layer, oxygen availability, and contaminant bioavailability. Mobility of nonylphenol in soil is low.[4]
Health and Environmental Hazards
Nonylphenol is considered to be an endocrine disruptor due to weak ability to mimic estrogen and in turn disrupt the natural balance of hormones in affected organisms.[7][8][9] The effect is weak because nonylphenols are not very close structural mimics of estradiol, but the levels of nonylphenol can be sufficiently high to compensate.
Environmental Hazards
The effects of nonylphenol in the environment are the feminization of aquatic organisms, decreased male fertility, and decreased survival in young fish. [4] Nonylphenol can cause endocrine disruption in fish by interacting with estrogen receptors and androgen receptors. In the liver NP can disrupt steriodgenesis and can interfere with the level of FSH (follicle-stimulating hormone) released from the pituitary Concentrations of NP that inhibit reproductive development and function in fish also damaged kidneys, decreased body weight, and induced a stressed behavior. [10]
Human Health Hazards
Alkylphenols like nonylphenol and Bisphenol-A were found to have estrogenic effects in the body. They are known as xenoestrogens. [11] Estrogenic substances and other endocrine disruptors are compounds that have hormone-like effects in both wildlife and humans. Xenoestrogens usually function by binding to estrogen receptors and acting competitively toward natural estrogens. Alkylphenols like nonylphenol and related compounds are found in pesticides and industrial chemicals. Nonylphenol was discovered to have hormone like affects accidentally because it contaminated other experiments in laboratories that were studying natural estrogens that were using polystyrene tubes. The detergent nonylphenol ethoxylate is harmful when it degrades into nonylphenol in sewage treatment plants. [2] Unfortunately there limited articles on the endocrine activity of nonylphenol in comparison to BPA. One study conducted in Italian women showed that nonylphenol was one of the highest contaminants at a concentration of 32 ng/mL in breast milk when compared to other alkylphenols octylphenol, nonylphenol monoethoxylate, and two octylphenol ethoxylates. The study found a positive correlation between fish consumption and the concentration of NP in breast milk. Cite error: A <ref> tag is missing the closing </ref> (see the help page).
Drinking water does not represent a significant source of exposure in comparison to other sources such as food packing materials, cleaning products, and carious skin care products. Concentrations of nonylphenol in treated drinking water varied from 85 ng/l in Spain to 15 ng/l in Germany. [4]
Environmental protection policies
Nonylphenol and nonyphenol ethoxylates have been restricted in the European Union as a hazard to human and environmental safety.[12]
The European Union has included NP on the list of priority hazardous substances for surface water in the Water Framework Directive. They are now implementing a drastic reduction policy of NP's in surface waterways. The Environmental quality standard for NP was proposed to be 0.3 ug/l. In the USA, the EPA set criteria that recommended the NP concentration shoudl not exceed 6.6 ug/l in fresh water and 1.7 ug/l in saltwater. In other Asian and South American countries there is still a large about of APE's and little regulation. [13]
References
- ^ Record of Nonylphenol, mixed isomers in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 6 April 2011.
- ^ a b c Sonnenschein, Carlos, and Ana M. Soto. "An Updated Review of Environmental Estrogen and Androgen Mimics and Antagonists." The Journal of Steroid Biochemistry and Molecular Biology 65.1-6 (1998): 143-50.
- ^ a b c d EPA. 2010. Nonylphenol (NP) and Nonylphenal Ethoxylates (NPEs) Action Plan. February, 2014.
- ^ a b c d e f g Soares, A., B. Guieysse, B. Jefferson, E. Cartmell, and J.n. Lester. "Nonylphenol in the Environment: A Critical Review on Occurrence, Fate, Toxicity and Treatment in Wastewaters." Environment International 34.7 (2008): 1033-049.
- ^ Helmut Fiege, Heinz-Werner Voges, Toshikazu Hamamoto, Sumio Umemura, Tadao Iwata, Hisaya Miki, Yasuhiro Fujita, Hans-Josef Buysch, Dorothea Garbe, Wilfried Paulus "Phenol Derivatives" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim.doi:10.1002/14356007.a19_313.
- ^ a b Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1016/S0305-0491(99)00145-5, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with
|doi=10.1016/S0305-0491(99)00145-5instead. - ^ "Review article: Nonylphenol in the environment: A critical review on occurrence, fate, toxicity and treatment in wastewaters" A. Soares, B. Guieysse, B. Jefferson, E. Cartmell, J.N. Lester Environment International 2008, Volume 34, Pages 1033-1049. doi:10.1016/j.envint.2008.01.004 PMID 18282600
- ^ Minnesota Pollution Control Agency Statewide Endocrine Disrupting Compound Monitoring Study, 2007 - 2008
- ^ Nonylphenol, Environmental Working Group
- ^ Katherine E. Liney, Josephine A. Hagger, Charles R. Tyler, Michael H. Depledge, Tamara S. Galloway, Susan Jobling. "Health Effects in Fish of Long-Term Exposure to Effluents from Wastewater Treatment Works." Environ Health Perspect. 2006 April; 114(Suppl 1): 81–89. Published online 2005 October 21. doi: 10.1289/ehp.8058
- ^ Asimakopoulos, Alexandros G., Nikolaos S. Thomaidis, and Michael A. Koupparis. "Recent Trends in Biomonitoring of Bisphenol A, 4-t-octylphenol, and 4-nonylphenol." Toxicology Letters 210.2 (2012): 141-54. Web.
- ^ Official Journal of the European Union: DIRECTIVE 2003/53/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 18 June 2003 amending for the 26th time Council Directive 76/769/EEC relating to restrictions on the marketing and use of certain dangerous substances and preparations (nonylphenol, nonylphenol ethoxylate and cement), July 17, 2003
- ^ A. David, H. Fenet, E. Gomez "Alkylphenols in marine environments: distribution monitoring strategies and detection considerations". Mar. Pollut. Bull., 58 (2009), pp. 953–960
OliviaHall10 (talk) 16:47, 13 March 2014 (UTC)