Activity sheet for fs

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Activity sheet for fs

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The amount of chemical remaining after a half-life will always depend on the amount of the chemical originally applied.

It should be noted that some chemicals may degrade into compounds of toxicological significance. Soil The half-life of fipronil is days in aerobic soils.

Under aerobic conditions, naturally occurring soil organisms break down fipronil to form fipronil-sulfone. Fipronil can also be hydrolyzed to form fipronil-amide. Fipronil degrades on soil surfaces by ultraviolet radiation i. However, soil particles may prevent light from penetrating any significant depth of soil under field conditions and thereby increase residence time.

Activity sheet for fs

After soil treatment, fipronil usually does not travel further than the upper six inches of soil, and significant lateral movement is not expected.

Under these conditions, fipronil has a half-life of 4 to 12 hours. However, it degrades in alkaline conditions in direct proportion to increasing pH values. Fipronil-amide is the primary residue formed from hydrolysis. Results indicate that fipronil degradation products accumulate in riverbed sediment while the parent compound does not.

Fipronil applied to foliage partially photodegrades to form fipronil-desulfinyl. Indoor No indoor fate data were found.

Inthe FDA analyzed 84 domestic samples 3.

Technical Fact Sheet

No samples contained detectable levels of fipronil. Two samples had residues of fipronil that exceeded the legal limit tolerance. Inthe USDA analyzed poultry breast samples and poultry thigh samples for levels of fipronil. One poultry breast 0. No samples contained residues that exceeded the established U.

Birds Fipronil is highly toxic to bobwhite quail and pheasants, with an acute oral LD50 of The hour LC50 is 0. Fish eliminated fipronil completely 14 days after being transferred to clean water. The primary metabolites in fish are fipronil-sulfone and fipronil-sulfide.

In daphnids, the NOEL for fipronil was measured at 9. The fipronil-sulfone and fipronil-desulfinyl metabolites are 6.

Carryover effects were significant for males but not females moved to clean seawater three days before mating. Exposure to less than 5. The median effective concentration EC50 may be reported for sublethal or ambiguously lethal effects.

This measure is used in tests involving species such as aquatic invertebrates where death may be difficult to determine. This term is also used if sublethal events are being monitored. Boca Raton, FL, ; p When applied to water, fipronil varies greatly in its toxicity and potential to bioaccumulate in aquatic arthropods, depending on the species.

Recolonization was very poor for weeks, depending on the application rate. The RfD for fipronil is 2. The RfD is an estimate of the quantity of chemical that a person could be exposed to every day for the rest of their life with no appreciable risk of adverse health effects.If this "Fossil Find" scenario is typical of the work of scientists, what features of the nature of science does it demonstrate?

ANS. its uncertainty, and that teamwork is more efficient. The student worksheets section contains a table that I had the students fill out to guide them as they worked through the activity (I wanted them to make.

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