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Full-Text Articles in Physical Sciences and Mathematics
Comparison Of Agency And Volunteer Stream Assessments Using Macroinvertebrate Assemblages, David William Petry
Comparison Of Agency And Volunteer Stream Assessments Using Macroinvertebrate Assemblages, David William Petry
Masters Theses
Professional stream assessments can be both time and cost intensive. Many states have developed citizen science programs in an effort to provide reliable data to supplement agency assessments. To test how two of these protocols and their conclusions compare, I sampled 16 sites in seven streams within east central Illinois using techniques from two different organizations: Illinois RiverWatch and Illinois Environmental Protection Agency. Overall, spring RiverWatch, fall RiverWatch, and fall IEPA sampling all produced unique results and conclusions. Compared to fall IEPA assessments, spring RiverWatch was affected by differences in both sampling protocol and season. RiverWatch sampling in fall reduced …
Derivatization And Separation Of Natural Estrogens (Estrone, 17Β-Estradiol, And Estriol) Using Gas Chromatography With Flame Ionization Detection (Gc-Fid), Dena L. Guptill
Masters Theses
A major cause of concern for estrogens found in the environment is that even at very low concentrations (10-100 ng/L) they can have a negative effect on aquatic ecosystems by disrupting endocrine systems. Due to the increasing importance of monitoring the levels of estrogens in the environment, a detection method was developed to identify and quantify three natural estrogens (estrone, 17β-estradiol and estriol) using gas chromatography with flame ionization detection (GC-FID). In addition, the efficacy of two derivatizing agents, N,O-bis(trimethylsilyl) acetamide (BSTA) and N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA), was evaluated. The GC detector (FID) was most responsive with E3, followed by E1 and …
Effects Of Treated Wastewater Effluent On Microbial Community Structure In A Natural Receiving Aquatic System, Matthew D. Hladilek
Effects Of Treated Wastewater Effluent On Microbial Community Structure In A Natural Receiving Aquatic System, Matthew D. Hladilek
Masters Theses
Despite our dependency on treatment facilities to condition wastewater for eventual release to the environment, our knowledge regarding the effects of treated water on the local watershed is extremely limited. Responses of these lotic systems to the treated wastewater effluent have been traditionally investigated by examining the benthic macroinvertebrate assemblages and community structure; however, these studies do not address the microbial diversity of the water systems. In the present study, planktonic and benthic bacterial community structure were examined at fourteen sites (from 60 m upstream to 12,100 m downstream) and at two time points along an aquatic system receiving treated …