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    which of the following best describes why ddt is classified as a persistent organic pollutant?

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    Persistent Organic Pollutants: A Global Issue, A Global Response

    The site explains the importance of the Stockholm Convention, a legally binding international agreement finalized in 2001, in which governments agreed to act to reduce or eliminate the production, use, and/or release of certain of these pollutants.

    Persistent Organic Pollutants: A Global Issue, A Global Response

    This page was created:

    to raise awareness about the health and environmental impacts of persistent organic pollutants (POPs),

    to show what actions the United States and some other countries have already taken to address these pollutants, and

    to describe the actions set into motion by the Stockholm Convention on Persistent Organic PollutantsEXIT

    EXIT EPA WEBSITE

    to address this issue globally.

    The page explains the importance of the Stockholm Convention, a legally binding international agreement finalized in 2001. In the Stockholm Convention, participating governments agreed to take actions to reduce or eliminate the production, use, and/or release of certain of these pollutants.

    This content was created in 2002 and updated in December 2009.

    Contents

    What Are POPs?

    What Domestic Actions Have Been Taken to Control POPs?

    How Do POPs Affect People and Wildlife?

    The Great Lakes: A Story of Trials and Triumphs

    Alaska: POPs in America’s Arctic

    The Stockholm Convention

    Table: The "Dirty Dozen"

    What Has the United States Done to Address POPs Globally?

    Resources

    A Global Issue

    Persistent organic pollutants (POPs) are toxic chemicals that adversely affect human health and the environment around the world. Because they can be transported by wind and water, most POPs generated in one country can and do affect people and wildlife far from where they are used and released. They persist for long periods of time in the environment and can accumulate and pass from one species to the next through the food chain. To address this global concern, the United States joined forces with 90 other countries and the European Community to sign a groundbreaking United Nations treatyEXIT

    EXIT EPA WEBSITE

    in Stockholm, Sweden, in May 2001. Under the treaty, known as the Stockholm Convention, countries agreed to reduce or eliminate the production, use, and/or release of 12 key POPs (see box), and specified under the Convention a scientific review process that has led to the addition of other POPs chemicals of global concern.

    The "Dirty Dozen" aldrin ¹ chlordane ¹

    dichlorodiphenyl trichloroethane (DDT)¹

    dieldrin¹ endrin¹ heptachlor¹

    hexachlorobenzene ¹,²

    mirex¹ toxaphene¹

    polychlorinated biphenyls (PCBs) ¹,²

    polychlorinated dibenzo-p-dioxins²(dioxins)

    polychlorinated dibenzofurans² (furans)

    1-Intentionally Produced.

    2-Unintentionally Produced - Result from some industrial processes and combustion.

    (For more information about the dirty dozen, see table below.)

    NOTE:  These are the chemicals initially addressed by the Stockholm Convention when negotiated.  Since that time, other chemicals have been added to the Convention.  See www.pops.intEXIT

    EXIT EPA WEBSITE

    for the complete list.

    Many of the POPs included in the Stockholm Convention are no longer produced in this country. However, U.S. citizens and habitats can still be at risk from POPs that have persisted in the environment from unintentionally produced POPs that are released in the United States, from POPs that are released elsewhere and then transported here (by wind or water, for example), or from both. Although most developed nations have taken strong action to control POPs, a great number of developing nations have only fairly recently begun to restrict their production, use, and release.

    The Stockholm Convention adds an important global dimension to our national and regional efforts to control POPs. Though the United States is not yet a Party to the Stockholm Convention, the Convention has played a prominent role in the control of harmful chemicals on both a national and global level. For example, EPA and the states have significantly reduced the release of dioxins and furans to land, air, and water from U.S. sources. In addition to assessing dioxins, EPA has also been working diligently on the reduction of DDT from global sources. The United States and Canada signed an agreement for the Virtual Elimination of Persistent Toxic Substances in the Great Lakes to reduce emissions from toxic substances. The United States has also signed the regional protocol of the United Nations Economic Commission for Europe on POPs under the Convention on Long-Range Transboundary Air PollutionEXIT

    EXIT EPA WEBSITE

    which addresses the Stockholm Convention POPs and other chemicals.

    In addition to the POPs-related agreements the United States has taken part in signing, the United States has also provided ample financial and technical support to countries across the globe supporting POPs reduction. A few of these initiatives include dioxin and furan release inventories in Asia and Russia, and the reduction of PCB sources in Russia.

    What Are POPs?

    Many POPs were widely used during the boom in industrial production after World War II, when thousands of synthetic chemicals were introduced into commercial use. Many of these chemicals proved beneficial in pest and disease control, crop production, and industry. These same chemicals, however, have had unforeseen effects on human health and the environment.

    Source : www.epa.gov

    Yockers Unit 8 APES Review Flashcards

    Start studying Yockers Unit 8 APES Review. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

    Yockers Unit 8 APES Review

    8 studiers in the last hour

    Which of the following examples includes both a point and a nonpoint source of pollution?

    A

    A factory smokestack and a sewage overflow

    B

    Runoff from city streets and pesticides from agricultural fields

    C

    Waste from animal feedlots and sediment from construction sites

    D

    Fertilizer from suburban lawns and wastewater from a water treatment plant

    Click card to see definition 👆

    D

    Fertilizer from suburban lawns and wastewater from a water treatment plant

    Click again to see term 👆

    Which of the following is a point source pollutant that would likely affect the ecosystem health of a coral reef?

    A

    Small pieces of plastic washed in by local currents

    B

    Runoff of oil from nearby urban highway systems

    C

    Oil released from the broken hull of a shipwrecked tanker

    D

    Excess nutrients introduced by fertilization of farmland

    Click card to see definition 👆

    C

    Oil released from the broken hull of a shipwrecked tanker

    Click again to see term 👆

    1/18 Created by kayrudiger0

    Terms in this set (18)

    Which of the following examples includes both a point and a nonpoint source of pollution?

    A

    A factory smokestack and a sewage overflow

    B

    Runoff from city streets and pesticides from agricultural fields

    C

    Waste from animal feedlots and sediment from construction sites

    D

    Fertilizer from suburban lawns and wastewater from a water treatment plant

    D

    Fertilizer from suburban lawns and wastewater from a water treatment plant

    Which of the following is a point source pollutant that would likely affect the ecosystem health of a coral reef?

    A

    Small pieces of plastic washed in by local currents

    B

    Runoff of oil from nearby urban highway systems

    C

    Oil released from the broken hull of a shipwrecked tanker

    D

    Excess nutrients introduced by fertilization of farmland

    C

    Oil released from the broken hull of a shipwrecked tanker

    The LD50 for arsenic in humans is 13mg/kg. Which of the following approaches should be used to calculate the number of grams of arsenic it would take to reach the LD50 in a 140-pound person? [Note: 1kg=2.2pounds]

    A

    140lb×2.2lb1kg×1kg13mg×1g1,000mg140lb×2.2lb1kg×1kg13mg×1g1,000mg

    B

    140lb×1kg2.2lb×13mg1kg×1g1,000mg140lb×1kg2.2lb×13mg1kg×1g1,000mg

    C

    13mg1kg×50×140lb×1kg2.2lb13mg1kg×50×140lb×1kg2.2lb

    D

    13mg1kg×1kg2.2lb×140lb113mg1kg×1kg2.2lb×140lb1

    B

    140lb×1kg2.2lb×13mg1kg×1g1,000mg

    A pesticide was applied to a population of roaches, and it was determined that the LD50 was 55mgkg. If the average mass of a roach was 0.02kg, which of the following approaches will determine the dose in mg per roach?

    A

    55mg1kg×10.02kg55mg1kg×10.02kg

    B

    55mg1kg×50%×0.02kg55mg1kg×50%×0.02kg

    C

    55mg1kg×0.02kg55mg1kg×0.02kg

    D 0.02kg1×55mg1kg50% C

    55mg1kg×0.02kg55mg1kg×0.02kg

    Which of the following best describes the action of an endocrine disruptor?

    A

    An endocrine disruptor attacks hormones that invade a body system and cause disease.

    B

    An endocrine disruptor blocks the receptor protein binding site of a hormone so that the cell cannot receive a signal.

    C

    An endocrine disruptor acts as an organic catalyst, produced by living things to regulate the rate of chemical reactions.

    D

    An endocrine disruptor helps to transport substances, such as pesticides, in an organism following exposure.

    B

    An endocrine disruptor blocks the receptor protein binding site of a hormone so that the cell cannot receive a signal.

    Endocrine disruptors directly affect which of the following in an organism?

    A White blood cells B Hormones C Iron content D Oxygen levels B Hormones

    Which of the following is the most likely consequence of runoff transporting chemicals that are endocrine disruptors to a pond?

    A

    Decreased turbidity in the pond

    B

    Increased frequency of birth defects in fish populations in the pond

    C

    Increased mutualistic relationships between fish and frog populations in the pond

    D

    Increased dissolved oxygen in the pond

    B

    Increased frequency of birth defects in fish populations in the pond

    Which of the following is a way to potentially eliminate one of the greatest threats to the world's mangrove wetlands?

    A

    Increase desalination to reduce the effects of prolonged drought in mangroves.

    B

    Integrate ecologically sound shrimp aquacultural practices with mangrove management.

    C

    Construct dams in mangroves to increase sediment load and decrease pollution.

    D

    Employ irrigation methods to address potential desertification of mangrove habitats.

    B

    Integrate ecologically sound shrimp aquacultural practices with mangrove management.

    Which of the following practices would best help to protect against inland and coastal flooding in urban areas?

    A

    Regulating the use of pesticides and fertilizers in agriculture

    B

    Preserving wetland and coastal mangrove habitats

    C

    Increasing the capacity of the sewer lines so they can handle a larger volume of water

    Source : quizlet.com

    [Solved] Which of the following best describes why DDT is considered a...

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    Which of the following best describes why DDT is considered a...

    Which of the following best describes why DDT is considered a persistent organic pollutant?

    a.

    DDT is able to be used repeatedly with the same level of effectiveness.

    b.

    DDT is able to affect only target species while leaving non-target species unaffected.

    c.

    DDT remains in the environment for years after its use.

    d.

    DDT has a low impact on aquatic ecosystems.

    Science Environmental Science SCIENCE 1042

    Source : www.coursehero.com

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