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Research ArticleArticles

Pesticides And Toxic Substances In The Environment

Frederick W. Kutz and Ann E. Carey
Arboriculture & Urban Forestry (AUF) April 1986, 12 (4) 92-95; DOI: https://doi.org/10.48044/joa.1986.12.4.92
Frederick W. Kutz
Offices of Research and Development and, Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington, D.C. 20460
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Ann E. Carey
Offices of Research and Development and, Pesticides and Toxic Substances, U.S. Environmental Protection Agency, Washington, D.C. 20460
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Abstract

Uses of pesticides have been regulated under the authority of the Federal Insecticide, Fungicide, and Rodenticide Act since 1948. In 1972, the Act was amended to include particular emphasis on the protection of public health and the environment. One result of these amendments has been an increased awareness of monitoring activities. Monitoring data are critical factors in an exposure assessment and thus are important elements in quantitative evaluations of hazard and risk. Monitoring is a general term used to describe a wide variety of efforts. Basically, monitoring is an activity in which specimens of selected human and environmental components are sampled and then analyzed for evidence of chemical residues indicative of potential human, animal, or plant exposure.

Human and environmental monitoring programs for pesticides and selected toxic chemicals have been conducted for over 15 years. The initial ambient monitoring systems were designed to determine average concentrations of pesticides and related chemicals in human and environmental media on a nation-wide basis and determine changes in these concentrations over time. The results of these surveys showed that almost all of the general human population and various environmental components contained low concentrations of organochlorine pesticides. After the Environmental Protection Agency restricted many uses of certain chlorinated pesticides, the organophosphorous and carbamate insecticides which replaced them and some other commonly used pesticides were not as easily monitored by ambient surveys. Special monitoring studies had to be done more frequently to produce data on these compounds which were not as persistent or accumulative in the environment.

Since 1948, uses of pesticides in the United States have required registration under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). Registration activities were carried on first by the Department of Agriculture and, since 1970, by the Environmental Protection Agency (EPA). In 1972, the pesticides law was amended to require EPA to monitor for pesticide residues in humans and the environment. This monitoring requirement was based on the premise that an agency which approves the use of a chemical also should be responsible for determining the consequences of that approval. The requirement states: Section 20(c): Monitoring—The Administrator shall undertake such monitoring activities, including, but not limited to, monitoring in air, soil, water, man, plants, and animals, as may be necessary for the implementation of this Act and of the national pesticide monitoring plan. The Administrator shall establish procedures for the monitoring of man and animals, and their environment for incidental human and environmental pesticide pollution and the secular trends thereof, and identification of the sources of contamination and their relationship to human and environmental effects. Such activities shall be carried out in cooperation with other Federal, State, and local agencies.

Monitoring data are critical factors in an exposure assessment and thus are important elements in quantitative evaluations of hazard and risk. Studies in laboratory animals indicate actual or potential adverse biological activity (toxicity) of a chemical, while monitoring data are used to assess the exposure of selected human and environmental components to the chemical. Data from monitoring activities also are useful in determining the environmental pathways through which pesticide chemical residues move from their application orbit. Further, monitoring studies contribute substantial information about the intermediate and final environmental fate of pesticides and other toxic chemicals.

The objectives of this report are to describe the pesticide monitoring activities sponsored by the U.S. government since the 1970s and to present and discuss some resulting data and residue trends.

Monitoring Procedures

The FIFRA monitoring amendment which required the monitoring of pesticides actually gave legislative recognition to a cooperative pesticide monitoring effort among some Federal agencies that had operated for several years. These programs have been described in detail elsewhere and a summary of these activities is presented in Table 1. These monitoring activities were begun in the mid-1960s by a directive from President John F. Kennedy in 1963 to implement specific recommendations of the President’s Science Advisory Committee that appropriate federal agencies develop a continuing network to monitor pesticide residue levels in air, water, soil, humans, wildlife, and fish (9). The Department of Agriculture began to monitor pesticides in agricultural soils and crops nationwide in 1 966, and other departments soon followed with monitoring programs in their respective areas of responsibility. The National Pesticide Monitoring Program, as it was called, had nine component networks—air, water (surface water and bottom sediment), soil (agricultural and urban), estuarine organisms (finfish and shellfish), freshwater fish, wildlife (migratory and non-migratory birds), processed foods and animal feed, red meat and poultry, and humans (10). These were considered “ambient” monitoring activities, that is, they involved widely distributed, repeated specimen collection of human or environmental components within a well-defined, statistically based sampling frame, so that trends in pesticide residue concentrations over a broad geographic area could be measured (11).

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Table 1.

Pesticide monitoring programs in the United States in the 1970s.

Discussion

The pesticide monitoring programs in the United States began to generate a body of data that revealed a significant degree of low-level environmental contamination by many organochloride pesticides (Tables 2–6). This information, as well as results of many other scientific studies on these persistent pesticides and growing public concern, prompted EPA to cancel or suspend many previously registered uses of several pesticides, including DDT, aldrin, dieldrin, mirex, chlordane, and heptachlor.

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Table 2.

Selected pesticide residues found in human adipose tissue and blood serum samples from the general population1

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Table 3.

Frequency of selected pesticide residues in urine from persons 12-74 years, United States, 1976-1980.1

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Table 4.

Summary of ambient air monitoring data for selected pesticides at 10 U.S. locations, 19801

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Table 5.

Summary of pesticide residues detected in surface water, National Surface Water Monitoring Program1

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Table 6.

Summary of pesticide residues detected in bottom sediments, National Surface Water Monitoring Program1

Data from the ambient monitoring networks were used in the resulting legal hearings to show the chemicals’ persistence, occurrence, and movement in humans and the environment. The ambient monitoring networks also detected decreases in mean concentrations of these chemicals after some uses were discontinued. This helped demonstrate the effectiveness of chemical use restrictions in reducing exposure levels of persistent synthetic chemicals. Additional chemical analyses were added to several of the monitoring programs to produce data on polychlorinated biphenyls (PCBs), heavy metals, and some non-pesticidal toxic chemicals with in dustrial uses.

The substitutes for the organochlorine pesticides were primarily organophosphorous and carbamate compounds which were not as persistent, accumulative, or mobile in the environment; however, neither were they as easily monitored with ambient surveys (Table 3). Therefore, special monitoring studies had to be done more frequently to provide the required data on residue occurrence from specific pesticide uses. Such “special” studies are limited in comparison to ambient monitoring surveys—that is, there may be no repeated sample collection, the study encompasses a limited geographic area, and there is only a single chemical or a few chemicals monitored, or a single sample medium involved. Tables 7 to 9 present results from a few of these kinds of monitoring studies.

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Table 7.

Concentrations of dibromochloropropane (DBCP) in drinking water from selected areas of the United States, 1979.1

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Table 8.

Aldicarb concentrations in Soil Sampling location: Hillsbourough County, FL Soil: Loamy, siliceious, thermic, grossarenic paleudult Treatment: Temik applied once, 12 months prior to sampling at a rate of 67.2 kg formulated product/ha.

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Table 9.

Aldicarb concentrations in Soil Sampling Location: Washington County, MS Soil: Fine-loamy, mixed, thermic, mollic hapludalf Treatment: Temik 10G at 5.0 kg a.i./ha/year for 2 years and Temik 15G at 3.4 kg a.i./ha/year for 5 years.

Footnotes

  • ↵1 Presented at the annual conference of the International Society of Arboriculture in Milwaukee in August 1985.

  • © 1986, International Society of Arboriculture. All rights reserved.

Literature Cited

  1. 1.
    1. Duggan R. E. and
    2. Cook. H. R.
    1971. National food and feed monitoring program. Pestic. Monit. J. 5:37–43.
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  2. 2.
    1. Yobs. A. R.
    1971. The national human monitoring program for pesticides. Pestic. Monit. J. 5:44–46.
    OpenUrlPubMed
  3. 3.
    1. Inglis, A.
    2. Henderson, C. and
    3. Johnson. W. L.
    1971. Expanded program for pesticide monitoring in fish. Pestic. Monit. J. 5:47–49.
    OpenUrlPubMed
  4. 4.
    1. Dustman, E. H.
    2. Martin, W. E.
    3. Heath, R. G. and
    4. Reichel. W. L.
    1971. Monitoring pesticides in wildlife. Pestic. Monit. J. 5:50–52.
    OpenUrlPubMed
  5. 5.
    1. Carver. T. C.
    1971. Estuarine monitoring program. Pestic. Monit. J. 5:53.
    OpenUrlPubMed
  6. 6.
    1. Felts, H. R.
    2. Sayers, W. T. and
    3. Nicholson. H. P.
    1971. National program for the assessment of pesticide residues in water. Pestic. Monit. J. 5:54–62.
    OpenUrlPubMed
  7. 7.
    1. Wiersma, G. B.
    2. Sand, P. F. and
    3. Cox. E. L.
    1971. A sampling design to determine pesticide residue levels in soils of the conterminous United States. Pestic. Monit. J. 5:63–66.
    OpenUrlPubMed
  8. 8.
    1. Yobs. A. R.
    1971. National monitoring program for air. Pestic. Monit. J. 5:67.
    OpenUrlPubMed
  9. 9.↵
    1. Bennett. I. L.
    1967. Foreword. Pestic. Monit. J. 1:i.
  10. 10.↵
    1. R. E. Lee, Jr.
    1. Kutz, F. W.
    2. Yobs, A. R. and
    3. Yang. H.S.C.
    1976. National pesticide monitoring programs. In: R. E. Lee, Jr. (ed.), Air Pollution from Pesticides and Agricultural Processes, pp. 95–136. CRC Press, Cleveland, Ohio. U.S.A.
  11. 11.↵
    1. Kutz. F. W.
    1983. Chemical exposure monitoring. Residues Reviews 85:277–292.
    OpenUrl
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Pesticides And Toxic Substances In The Environment
Frederick W. Kutz, Ann E. Carey
Arboriculture & Urban Forestry (AUF) Apr 1986, 12 (4) 92-95; DOI: 10.48044/joa.1986.12.4.92

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Pesticides And Toxic Substances In The Environment
Frederick W. Kutz, Ann E. Carey
Arboriculture & Urban Forestry (AUF) Apr 1986, 12 (4) 92-95; DOI: 10.48044/joa.1986.12.4.92
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