Date of Graduation
Bachelor of Science in Civil Engineering
Soerens, Thomas S.
Williams, Rodney D.
This study sought to investigate the different response of two indicator species tests: HachÂ® PathoScreenâ„¢ Field Test and IDEXX ColilertÂ® using the Quanti-Tray/2000Â® enumeration method. Both tests were carried out according to the instructions enclosed in the packages using diluted water samples taken from the secondary clarifier at the West Side Waste Water Treatment Plant in Fayetteville, AR. The tests were carried out at various temperatures in an attempt to reflect conditions that could be encountered in the field, where electricity, equipment, and expertise may not be available. The PathoScreenâ„¢ test responded adequately at a relatively wide range of temperatures, from approximately 22Â°C to 35Â°C, whereas the Quanti-Tray/2000Â® method was much more sensitive, producing erratic responses. In addition to PathoScreenâ„¢ yielding more consistent responses, the field kit and materials necessary for that test are much cheaper than those for using the Quanti- Tray/2000Â® method. These results suggest that the HachÂ® PathoScreenâ„¢ test, a hydrogen sulfide (H2S) presence-absence (PA) test, is more reliable for use in the field.
Guinn, Maranda, "The Effects of Temperature on Indicator Species Tests for Water Quality" (2012). Civil Engineering Undergraduate Honors Theses. 10.