Yara Abstract
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Sivutunniste: Op_fi3426 |
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| Moderaattori:Ei ole (katso kaikki) Kuinka ryhtyä moderaattoriksi? Sivun edistyminen: Täysluonnos. Arvostuksen määrää ei ole arvioitu (ks. peer review). |
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Nonylphenoletoxylates are synthetic, organic compounds with excellent surfactant properties. They are harmful for the environment especially because of their decomposition product, nonylphenol. It may cause respiratory toxicity, deceleration of growth and inhibit differentiation of cells. Nonylphenoletoxylates and nonylphenol are considered as hazardous substances for the water environment in the Finnish and the European legislations. Therefore, environmental quality standard has been set for nonylphenoletoxylates and nonylphenol.
The aim of the study is to 1) evaluate maximum concentrations and harmful consequences for the environment of the use of nonylphenoletoxylates, 2) evaluate the transport, environmental load and decomposition of the nonylphenoletoxylates and 3) compare measured concentrations with the modelled concentrations and evaluate the environmental risks. In addition, the analysis methodology developed for the nonylphenoletoxylates and nonylphenol is described.
The study area is located in the municipality of Siilinjärvi in Eastern Finland and consists of Yara Suomi Oy’s industrial and mining site and surrounding water bodies. Water and sediment sampling was done in the summer of 2010. The sampling included measuring the physical parameters of water using a field surveying device. The analyses showed that concentrations of nonylphenoletoxylates were high in the industrial and mining site but were diminished in the Juurusvesi Lake. This diminution was thought to be caused by mixing of nonylphenoletoxylate bearing and clean waters. Nonylphenol was not detected in the analysis. Environmental quality standard is exceeded in the industrial and mining site but the concentrations are below it in the Juurusvesi Lake waters. Maximum environmental load of the nonylphenoletoxylate to Juurusvesi Lake was estimated to 1080 kg/a and to the western side of the Musti tailings pond 27 kg/a. according to the modelling the risk for the environment in the Juurusvesi Lake is insignificant. The infiltration of the nonylphenoletoxylates to ground water was estimated to be minor.
It is suggested that the concentrations of the nonylphenoletoxylates should be monitored regularly and the emissions should be reduced to protect the environment.
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