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Link to relevant study record s Description of key information Key value for chemical safety assessment Additional information When release in the atmosphere boron trifluoride BF3 molecules in contact with atmospheric humidity form a complex: dihydrated boron trifluoride BF3, 2H2O.

On the opposite if BF3 is directly brought into contact with water, it reacts violently. That is the reason why all the assessment of environmental fate and pathways is based on the properties of the more stable dihydrate form of boron trifluoride and those of its breakdown products in water: boric acid and fluoboric acid.

The abiotic degradation hydrolysis of tetrafluoroborate in water are ionic species and finally boric acid.

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Therefore it can be reasonably assumed that they will not be characterized by a high potential of bioaccumulation. The WHO review of boron noted that highly water soluble materials are cum să tratezi vederea cu un plus to bioaccumulate to any significant degree and that borate species are all present essentially as undissociated and highly soluble boric acid at neutral pH.

Encefalopatii autoimune Despre sistemul imunitar Imunitatea si semnificatia acesteia a cunoscut mai multe schimbari de-a lungul secolelor, odata cu cercetarile care s-au efectuat asupra sistemului imunitar, a reactiei organismului in fata bolilor, dar si asupra metodelor de tratament.

Laboratory data in oysters and salmon demonstrate low Bioconcentration Factors BCF for boron, although the tests pre-date current protocols. Thompson et al.

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Tissue concentrations in the oyster returned to background in 25 days. Suloway et al. Saiki et al.

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They observed the highest concentrations of boron in detritus and filamentous algae, and lower concentrations in invertebrates and fish. Saiki et al did not calculate accumulation factors and many of their analytical values were below their detection limits.

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Since these are field data, the body concentrations reflect uptake via both food and from water; BCF values theoretically reflect uptake from water only. If measurements below detection limits are taken to be equal to the detection limit value, the estimated values are: algae-BCF ca.

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cum să tratezi vederea cu un plus

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