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Assessment of Water Quality in Canals of Eastern Broward County, Florida, 1969-74

Description: From purpose and scope: The purpose of this report is to present and interpret information on water-quality conditions in the Broward County canal system from 1969-74 for use by agencies involved with water management and other interested concerns or individuals.
Date: February 1982
Creator: Waller, Bradley G. & Miller, Wesley L.
Partner: UNT Libraries Government Documents Department

Pesticide Registration and Tolerance Fees: An Overview

Description: This report gives an overview of the collection of fees to support U.S. Environmental Protection Agency (EPA) pesticide program activities. Authority to collect fees in addition to appropriated funds has been provided over the years in part to accelerate the agency's review efforts and to fund its increasing statutory responsibilities.
Date: August 18, 2008
Creator: Esworthy, Robert
Partner: UNT Libraries Government Documents Department

Pesticide Law: A Summary of the Statutes

Description: This report defines key terms, provides a brief history of the federal pesticide laws, and describes key provisions of the laws, including the pesticide registration process and how it interfaces with food safety requirements. In addition, this report lists several references for more detailed information about the acts, and two tables cross reference sections of the U.S. Code with corresponding sections of the acts. The report is descriptive rather than analytic, highlights key provisions rather than providing a comprehensive inventory of the acts' numerous sections, and addresses authorities and limitations imposed by statute, rather than the status of the Environmental Protection Agency (EPA) implementation or other policy issues.
Date: November 17, 2008
Creator: Schierow, Linda-Jo
Partner: UNT Libraries Government Documents Department

Pesticide Law: A Summary of the Statutes

Description: This report summarizes the major statutory authorities governing pesticide regulation: the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), and Section 408 of the Federal Food, Drug, and Cosmetic Act (FFDCA), as well as the major regulatory programs for pesticides.
Date: March 19, 2008
Creator: Schierow, Linda-Jo
Partner: UNT Libraries Government Documents Department

Pesticide Registration and Tolerance Fees: An Overview

Description: This report gives an overview of the collection of fees to support U.S. Environmental Protection Agency (EPA) pesticide program activities. Authority to collect fees in addition to appropriated funds has been provided over the years in part to accelerate the agency's review efforts and to fund its increasing statutory responsibilities.
Date: August 18, 2008
Creator: Esworthy, Robert
Partner: UNT Libraries Government Documents Department

Profile of the Youth Self-Report Among South Texas Adolescents and the Potential Relationship to Pesticide Exposure

Description: The potential for human exposure to pesticides exists particularly for agricultural workers (i.e. migrant workers) and individuals within close proximity to pesticide-sprayed crops (i.e. those living on or near agricultural farms). Children, through biology and behavior, may be more susceptible and vulnerable to exposure to pesticides than adults. The purpose of this study was to examine young populations particularly at-risk for occupational or accidental exposure to pesticides and determine associated behavioral, emotional, and physical symptoms. A total of 444 students from two South Texas school districts completed questionnaires assessing level of risk of exposure to pesticides and were categorized into at-risk and low risk categories. Physical, emotional, and behavioral symptoms were obtained using the Youth Self-Report. Children who were at-risk demonstrated significantly higher scores on the Youth Self-Report (YSR) in the areas of anxious/depressed, attention problems, social problems, somatic complaints, thought problems, withdrawal, internalizing behaviors, and total problem behaviors than children who were at lower risk of pesticide exposure. Odds ratios were obtained and suggested that children in the at-risk category were more five times more likely to score in the clinically significant range on the Attention Problems subscale, and three times more likely to score in the clinically significant range on the Internalizing behavior composite. These findings suggest that children who may be at higher risk for pesticide exposure may also be at higher risk for physical, behavioral, and emotional problems compared to children who are at lower risk. This information is intended to benefit schools and health care professionals who work with rural or migrant populations involved in the agricultural trade. Future research will be needed to assess through biomarkers the degree of measurable pesticide exposure in comparison to parent reports, teacher reports, school achievement, neuropsychological testing, and medical records.
Date: August 1999
Creator: Hagar, Kristy S.
Partner: UNT Libraries

POST-REMEDIATION BIOMONITORING OF PESTICIDES AND OTHER CONTAMINANTS IN MARINE WATERS AND SEDIMENT NEAR THE UNITED HECKATHORN SUPERFUND SITE, RICHMOND, CALIFORNIA

Description: Marine sediment remediation at the United Heckathorn Superfund Site was completed in April 1997. Water and mussel tissues were sampled in February 1999 from four stations near Lauritzen Canal in Richmond, California, for Year 2 of post-remediation monitoring of marine areas near the United Heckathorn Site. Dieldrin and dichlorodiphenyl trichloroethane (DDT) were analyzed in water samples, tissue samples from resident mussels, and tissue samples from transplanted mussels deployed for 4 months. Mussel tissues were also analyzed for polychlorinated biphenyls (PCB), which were detected in sediment samples. Chlorinated pesticide concentrations in water samples were similar to preremediation levels and did not meet remediation goals. Biomonitoring results indicated that the bioavailability of chlorinated pesticides has been reduced from preremediation levels both in the dredged area and throughout Richmond Harbor. Total DDT and dieldrin concentrations in mussel tissues were lower than measured levels from preremediation surveys and also lower than Year 1 levels from post-remediation biomonitoring. Sediment analyses showed the presence of elevated DDT, dieldrin, PCB aroclor 1254, and very high levels of polynuclear aromatic hydrocarbons (PAH) in Lauritzen Channel.
Date: September 6, 2000
Creator: Antrim, Liam D. & Kohn, Nancy P.
Partner: UNT Libraries Government Documents Department

Bee Health: The Role of Pesticides

Description: This report briefly describes recent scientific research and analysis regarding the potential role of pesticides among the factors affecting the health and well-being of bees.
Date: February 17, 2015
Creator: Johnson, Renée & Corn, M. Lynne
Partner: UNT Libraries Government Documents Department

Occurrence of Pesticide Residues in Four Streams Draining Different Land-Use Areas in Pennsylvania

Description: From introduction: This study was conducted to determine the relative degree of pesticide contamination in four small drainage basins and to determine if pesticide residues were present in amounts that could be hazardous to humans or detrimental to aquatic life.
Date: June 1975
Creator: Truhlar, John F. & Reed, Lloyd A.
Partner: UNT Libraries Government Documents Department

The Quality of Surface Waters in Texas

Description: Abstract: The discharge-weighted average concentrations of dissolved solids, chloride, and sulfate for many of the principal streams in Texas are less than 500 mg/1 (milligrams per liter), 250 mg/1, and·250 mg/1, respectively. At 65 of 131 sites on streams that were sampled at least 10 times, the biochemical oxygen demand of at· least half the samples exceeded 3,0 mg/1. At 20 of the sites, the dissolved-oxygen content of at least !half the samples was less than 5.0_ mg/1. The higher concentrations of minor elements usually were detected in waters from urban areas, indicating a relation to man's activities. Small amounts of some pesticides are widely distributed in low concentrations. The higher concentrations usually were detected in waters from urban areas. Small amounts of some of the pesticides studied are widely distributed in surface waters in Texas. Some of the more widely distributed pesticides were 2,4,5-T at 96 sites, diazinon at 80 sites, 2,4-D at 78 sites, dieldrin at 77 sites, Silvex at 47 sites, DDT at 67 sites, lindane at 59 sites, DDD at 51 sites, DDE at SO sites, and chlordane at 38 sites.
Date: July 1974
Creator: Rawson, Jack
Partner: UNT Libraries Government Documents Department

Pesticide Registration and Tolerance Fees: An Overview

Description: This report provides a historical overview of federal authority regarding pesticide fees, including the amount of fee revenues collected over time, and summarizes the key elements of the Pesticide Registration Improvement Act (PRIA) and the revisions reflected in PRIA 2.
Date: December 19, 2005
Creator: Esworthy, Robert
Partner: UNT Libraries Government Documents Department

Pesticide Registration and Tolerance Fees: An Overview

Description: This report provides a historical overview of federal authority regarding pesticide fees, including the amount of fee revenues collected over time, and summarizes the key elements of the Pesticide Registration Improvement Act (PRIA) and the revisions reflected in PRIA 2.
Date: June 11, 2008
Creator: Esworthy, Robert
Partner: UNT Libraries Government Documents Department

Pesticide Registration and Tolerance Fees: An Overview

Description: This report provides a historical overview of federal authority regarding pesticide fees, including the amount of fee revenues collected over time, and summarizes the key elements of the Pesticide Registration Improvement Act (PRIA) and the revisions reflected in PRIA 2.
Date: February 12, 2008
Creator: Esworthy, Robert
Partner: UNT Libraries Government Documents Department

Use of geographic information systems for assessing ground water pollution potential by pesticides in central Thailand

Description: This study employed geographic information systems (GIS) technology to evaluate the vulnerability of groundwater to pesticide pollution. The study area included three provinces (namely, Kanchana Buri, Ratcha Buri, and Suphan Buri) located in the western part of central Thailand. Factors used for this purpose were soil texture, percent slope, primary land use, well depth, and monthly variance of rainfall. These factors were reclassified to a common scale showing potential to cause groundwater contamination by pesticides. This scale ranged from 5 to 1 which means high to low pollution potential. Also, each factor was assigned a weight indicating its influence on the movement of pesticides to groundwater. Well depth, the most important factor in this study, had the highest weight of 0.60 while each of the remaining factors had an equal weight of 0.10. These factors were superimposed by a method called “arithmetic overlay” to yield a composite vulnerability map of the study area. Maps showing relative vulnerability of groundwater to contamination by pesticides were produced. Each of them represented the degree of susceptibility of groundwater to be polluted by the following pesticides: 2,4-D, atrazine, carbofuran, dicofol, endosulfan, dieldrin & aldrin, endrin, heptachlor & heptachlor epoxide, total BHC, and total DDT. These maps were compared to groundwater quality data derived from actual observations. However, only the vulnerability maps of atrazine, endosulfan, total BHC, and heptachlor & heptachlor epoxide showed the best approximation to actual data. It was found that about 7 to 8%, 83 to 88% and 4.9 to 8.7% of the study area were highly, moderately, and lowly susceptible to pesticide pollution in groundwater, respectively. In this study a vulnerability model was developed, which is expressed as follow: V = 0.60CW + 0.10CS + 0.10CR + 0.10CL + 0.10CSL. Its function is to calculate a vulnerability score for a certain ...
Date: August 2002
Creator: Thapinta, Anat
Partner: UNT Libraries

Nonpoint-Source Discharges in Pequea Creek Basin, Pennsylvania, 1977

Description: From abstract: The objective of this project was to assess the magnitudes and types of nonpoint discharges that affect the water quality of Pequea Creek. The project included the determination of (1) the total discharge of suspended sediment, nitrogen, and phosphorus from the basin; (2) intermittent storm and base-flow discharges from six subbasin sites of varying size, geology, and land use; (3) the difference in magnitudes of the discharges during base-flow periods and storms; and (4) which variables most affect the transport of these constituents.
Date: November 1979
Creator: Ward, Janice R. & Eckhardt, David A.
Partner: UNT Libraries Government Documents Department

Effects of Water Source, Suspended Solids, and Acclimation on Biotransformation of 2 /4-Dichlorophenoxy Acetic Acid in Aquatic Systems

Description: In recent years there has been a great deal of scientific interest in processes that affect the fate of organic chemicals in the environment. one main reason for this increased interest is due to greater environmental concern over accidental or purposeful release of these chemicals into the environment by man. A major environmental concern is the increased use of pesticides over the last few years. In the thirty years prior to 1978 the use of pesticides has increased by a factor of forty (Ridgeway et al., 1978). Recently the use of herbicides has been increasing, but that of insecticides has stabilized (Willis, 1983). Detectable amounts of organic pesticides can be found in many areas of the biosphere. For toxic organic chemicals to be used safely, researchers must have a clear understanding of the fate and persistence of these chemicals when they are released into the environment. This understanding will also allow the development of new products that, when properly used, will not produce adverse effects to man or the environment (Weber, 1972). According to the Toxic Substance Control Act (TSCA) any new or expanded-use chemical that might be released into the environment must be tested for environmental hazard.
Date: August 1985
Creator: Moses, Christopher K. (Christopher Karam)
Partner: UNT Libraries

Description of Survey Data Regarding the Chemical Repackaging Plant Accident West Helena, Arkansas

Description: Shortly after 1:00 p.m. on Thursday, May 8, 1997, clouds of foul-smelling smoke began pouring from an herbicide and pesticide packaging plant in West Helena, Arkansas. An alert was sounded, employees evacuated, and the West Helena fire department was called. As three firefighters prepared to enter the plant, the chemical compounds exploded, collapsing a solid concrete block wall, and killing all three firefighters. As the odorous smoky cloud drifted away from the plant, authorities ordered residents in a 2-mile area downwind of the plant to evacuate and those in the 2- to 3-mile zone to shelter in place. This study examines and compares the responses to a mail survey of those ordered to evacuate and those told to shelter in place. Among the variables examined are compliance with official orders and perceived warnings, threat perception, time and source of first warning, response times, and behavior characteristics for both populations. The findings indicate that 90% of those that were told to evacuate did so but only 27% of those told to shelter-in-place did so, with 68% opting to evacuate instead. The implications of these findings for emergency managers is that people will likely choose to evacuate when both warnings to evacuate and warnings to shelter are issued to residents in close proximity to each other. The findings on warning times closely resemble other findings from evacuations when chemical accidents occur and route notification is used for warning residents.
Date: March 1, 1999
Creator: Sorensen, J.H. & Vogt, B.M.
Partner: UNT Libraries Government Documents Department

Impacts of the Pyrethroid Insecticide Cyfluthrin on Aquatic Invertibrate Populations in Outdoor Experimental Tanks

Description: The chemical fate and biological impacts of cyfluthrin in aquatic ecosystems were investigated using microcosms (1.9 m^3 concrete tanks) during 1989. Results were compared to a concurrent pesticide registration study using mesocosms (634.7 m^3 earthen ponds). Ten spray drift and five soil runoff simulations were conducted. Pesticide loadings were scaled by system volume, with the same experimental design in ponds and microcosms. Aqueous cyfluthrin concentrations and sediment residue values were generally higher in microcosms, while aqueous half-life was shorter in the smaller systems.
Date: May 1992
Creator: Johnson, Philip C. (Philip Charles)
Partner: UNT Libraries