Missouri Water Center (MU)
https://hdl.handle.net/10355/90521
2024-03-29T07:49:03ZAccumulation of mercury by fish and turtles of the Little Piney River
https://hdl.handle.net/10355/91865
Accumulation of mercury by fish and turtles of the Little Piney River
Bertrand, Gary L.
The primary objective of this study was to determine whether mercury levels of fish in the Little Piney River have changed substantially in the past 25 years. We have concluded that there has been a definite decline in these mercury levels, though the reason for this is not clear.
1974-01-01T00:00:00ZAnalysis of social, fiscal, and structural factors affecting integrated pest management programs in Missouri and implications for future programs to protect water quality
https://hdl.handle.net/10355/91924
Analysis of social, fiscal, and structural factors affecting integrated pest management programs in Missouri and implications for future programs to protect water quality
Rikoon, J. Sanford; Constance, Douglas H.; Smith, George S.; Heffernan, William D.; Osburn, Donald D.
Integrated Pest Management (IPM) has experienced a resurgence of interest due in part to continuing reports of drinking water contamination by agricultural pesticides. In response to the decertification of certain pesticides used for soil insect control on corn, in the early 1970s federal programs established Cooperative Extension Service sponsored IPM programs in several midwestern States to promote insect scouting on corn and cotton. This report documents the various factors which facilitated the growth and decline of these programs in Missouri and the ongoing transformation of such services into the private sector and other agencies. The objective of this report is to provide policy prescriptions to enhance the future adoption of IPM in Missouri and other areas that will facilitate the protection of water resources. Research in Missouri regarding pesticide use practices and water quality issues indicates that there is a considerably higher incidence of IPM use in counties that historically had, or still currently have, Extension sponsored programs. Interviews were conducted with University personnel responsible for implementing these programs, county Extension agents responsible for overseeing the programs, private sector businesspeople who are currently offering IPM services, and farm opeators who previously used, and/or now participate in, IPM Extension programs or private services. Interviewees were asked what factors contributed to the success, failure, and/or transformation of the county programs. Results indicate that these factors include quality and turnover of the scouts, committment of the Extension agent, economic and climatological variables, institutional support, and packaging IPM programs with other programs such as irrigation.
1996-01-01T00:00:00ZAnalysis, characterization, and effects of heavy metal chealating agents in water
https://hdl.handle.net/10355/91884
Analysis, characterization, and effects of heavy metal chealating agents in water
Manahan, Stanley E.; Jones, David R. IV; Tung, Harvey C.; Koppenaal, David; Godwin, Judith; Ting, Bill
"The term 'chelating agents' refers to chemical ligands which bind to an element with more than one site. It is a ubiquitous term, since there are multitudes of compounds which fulfill the requirements for being called chelating agents. Their origin is both synthetic and natural, and the manner and fashion in which they bind is quite varied. Many of the vitamins and hormones essential to life are chelating agents. Chlorophyll, which is required for photosynthesis, consists of a porphyrin ring structure bound to magnesium. Hemoglobin binds iron in a similar pattern, and vitamin B-12 utilizes cobalt in the same fashion. In addition to these, there are quite a number of similar compounds in both plants and animals. Most metals transport and usage inside living things involve a chelation process. In natural water systems, the presence of chelating agents can have significant impact on the transport and toxicity of metals."--Introduction
Students supported: 5 Student Assistants
1976-01-01T00:00:00ZAn analytical method for total heavy metal complexing agents in water and its application to water quality studies
https://hdl.handle.net/10355/91859
An analytical method for total heavy metal complexing agents in water and its application to water quality studies
Manahan, Stanley E.; Smith, Michael J.; Jones, David; Harlan, Sandra; Kunkel, Robert; Myers, Ray; Isselhardt, Lee
The principle research accomplishment on this project was the development of several methods of analysis for low levels of complexing agents, particularly chelating agents. These species are very important in water quality. It is only very recently that their importance has become very apparent in areas such as heavy metal transport, algal growth, and toxicity of heavy metals. The first method developed, was an atomic absorption analysis of strong heavy metal chelating agents. This method is based upon the fact that when copper ion is added to a water sample and the pH adjusted to 10, the only copper that remains in solution is that which is in a complexed or chelated form. The precipitate which comes out of the solution at pH 10 contains the copper which is not complexed or chelated and is removed by filtration. The copper remaining in solution is measured by atomic absorption. This copper concentration is a measure of the amount of chelating agent in the water and is called the copper equivalent chelating capacity of the water. The method was used on a number of natural water samples. It was found, for example, that normal creek water contains about one milligram per liter copper equivalent chelating capacity. Water supporting algal growth typically contains about the same level. Raw sewage from a nonindustrial source typically contains around 3 milligrams per liter copper equivalent chelating capacity, whereas properly treated sewage effluent contains 1 milligram per liter or less. The method was extended to the analysis of cyanide ion, a water pollutant found in mining and metal processing effluents. It is applicable to cyanide and provides a simple and convenient method for the analysis of this pollutant. In the final few weeks of the project, a new method was developed in which the copper is solublized from a copper-containing chelating ion exchange resin. This method is much more rapid than the first method described, though somewhat more subject to interferences. It is applicable to automated procedures and as a detection system for chelating agents separated by liquid chromatography. It is extremely sensitive and can detect as little as 5x10^-7 millimoles of NTA. These applications of the method are being pursued under a USDI-OWRR matching grant starting on July 1, 1973.
1973-01-01T00:00:00Z