The Electrodeposition of Zinc

The Electrodeposition of Zinc

Date: August 1939
Creator: Flanagin, Charles E.
Description: This thesis examines the use of zinc for electroplating and compares its use to other metals. Experiments conducted to gather data indicated circumstances which resulted in optimal results.
Contributing Partner: UNT Libraries
Comparative Bioavailability of Dietary and Dissolved Cadmium to Freshwater Aquatic Snails

Comparative Bioavailability of Dietary and Dissolved Cadmium to Freshwater Aquatic Snails

Access: Use of this item is restricted to the UNT Community.
Date: December 2003
Creator: White, Jessica C.
Description: Heavy metal bioaccumulation in aquatic organisms may occur through direct or indirect uptake routes. Research indicates that the significance of uptake route varies with contaminant and organism exposed. The relative importance of different metal sources in aquatic systems was investigated by exposing freshwater snails to dietary or dissolved sources of cadmium. Snails were exposed to control, contaminated food only, contaminated water only, and contaminated food and water treatments. During the 15-day exposure, samples were taken to determine Cd concentration in snail soft tissue, snail shell, algal food, and overlying water. Analyses of snail soft tissue and shells indicate that exposure route significantly affects Cd concentrations in the tissues. In both cases, dissolved Cd is the primary contributor to metal body burden.
Contributing Partner: UNT Libraries
Magnetomorphic Oscillations in Cadmium Cylinders

Magnetomorphic Oscillations in Cadmium Cylinders

Date: August 1969
Creator: Hight, Ralph D.
Description: The work presented here is an experimental investigation of the effect of cylindrical geometry on electrical conductivity, in which single-crystal samples of cadmium at the temperature of liquid helium are used, with the diameter on the order of the electron mean free path.
Contributing Partner: UNT Libraries
Laboratory and field studies of cadmium effects on  Hyalella azteca in effluent dominated systems.

Laboratory and field studies of cadmium effects on Hyalella azteca in effluent dominated systems.

Date: August 2003
Creator: Stanley, Jacob K.
Description: Laboratory single-species toxicity tests are used to assess the effects of contaminants on aquatic biota. Questions remain as to how accurately these controlled toxicity tests predict sitespecific bioavailability and effects of metals. Concurrent 42-day Hyalella azteca exposures were performed with cadmium and final treated municipal effluent in the laboratory and at the University of North Texas Stream Research Facility. Further laboratory testing in reconstituted hard water was also conducted. Endpoints evaluated include survival, growth, reproduction, and Cd body burden. My results demonstrate that laboratory toxicity tests may overestimate toxicity responses to cadmium when compared to effluent dominated stream exposures. Discrepancies between endpoints in the three tests likely resulted from increased food sources and decreased cadmium bioavailability in stream mesocosms
Contributing Partner: UNT Libraries
Ecotoxicological Investigations in Effluent-Dominated Stream Mesocosms

Ecotoxicological Investigations in Effluent-Dominated Stream Mesocosms

Date: December 2002
Creator: Brooks, Bryan W.
Description: The University of North Texas Stream Research Facility (UNTSRF) was designed to examine contaminant impacts on effluent-dominated stream ecosystems. Stream mesocosms, fed municipal effluent from the City of Denton, TX, Pecan Creek Water Reclamation Plant (PCWRP), were treated with 0, 15 or 140 µg/L cadmium for a 10-day study in August 2000. Laboratory toxicity test and stream macroinvertebrate responses indicated that cadmium bioavailability was reduced by constituents of effluent-dominated streams. The Biotic Ligand Model (BLM) for Cd was used to predict a 48 hour Cd EC50 for Ceriodaphnia dubia of 280 µg/L in these effluent-dominated streams. This value is higher that an EC50 of 38.3 µg/L Cd and a 7-day reproduction effect level of 3.3 µg/L Cd generated for C. dubia in reconstituted laboratory hard water. These results support use of a cadmium BLM for establishing site-specific acute water quality criteria in effluent-dominated streams. Although not affected by 15 µg/L treatments, organisms accumulated Cd in 15 µg/L treated streams. Hence, over longer exposure periods, Cd accumulation may increase and a no effect level may be lower than the observed 10-day no effect level of 15 µg/L. A toxicity identification evaluation procedure was utilized with in vitro and in vivo bioassays ...
Contributing Partner: UNT Libraries
The Hexagon, Volume 103, Number 1, Spring 2012

The Hexagon, Volume 103, Number 1, Spring 2012

Date: Spring 2012
Creator: Alpha Chi Sigma
Description: Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Contributing Partner: UNT Libraries
Rediscovery of the Elements: The Harz Mountains and Göttingen

Rediscovery of the Elements: The Harz Mountains and Göttingen

Date: Spring 2012
Creator: Marshall, James L., 1940- & Marshall, Virginia R.
Description: Article describing the importance of the Harz Mountains and the University of Göttingen in the discovery of cadmium and thallium. Tourist information regarding the area is included.
Contributing Partner: UNT College of Arts and Sciences