Biomedical subjects

T G Hinton

Publications and source records attributed to T G Hinton.

21 records · Page 2Linked to original sources

PubMed1992

Contamination of plants by resuspension: a review, with critique of measurement methods.

Resuspension of contaminated soil particles can be an important process that prolongs the availability of contaminants within the environment. Inhalation and inadvertent ingestion of resuspended soil particles may be important pathways to human exposure. Our understanding of the processes and mechanisms of resuspension onto plant surfaces are currently inadequate for accurate predictions. Part of this is due to the use of measurement techniques designed for inhalation studies that are not efficient for gaining understanding about phenomena occurring at the plant surface. I discuss the shortcomings of such techniques, review the data from a technique that currently has the most merit (mass loading), and suggest new techniques, as well as specific needs for future research. The paper's focus is on the contamination of plant surfaces by resuspended soil particles, not the inhalation of such particles.

Environmental Monitoring↗

PubMed1985

A field experiment on Rn flux from reclaimed uranium mill tailings.

Design and construction techniques are described for a 1.6 ha experimental reclamation plot consisting of a 1-m-thick slab of uranium mill tailings covered with various depths of overburden. A passive, activated charcoal device was developed and used for measurements of Rn flux at the soil surface. Observations on Rn flux vs overburden depth indicated that tailings covered with 1.5 m of revegetated or 0.3 m of bare overburden had Rn exhalation rates comparable to background. Vegetated subplots exhibited a significantly higher (often an order of magnitude) flux than the bare subplots. A positive correlation was observed between precipitation quantities and Rn flux.

Metallurgy↗

PubMedDate not supplied

Apatite and phillipsite as sequestering agents for metals and radionuclides.

Laboratory and greenhouse studies were conducted to quantify apatite and phillipsite (zeolite) sequestration of selected metal contaminants. The laboratory batch study measured the sorption of aqueous Co2+, Ba2+, Pb2+, Eu3+, and UO2(2+). Apatite sorbed more Co2+, Pb2+, Eu3+, and UO2(2+) from the spike solution than phillipsite, resulting in distribution coefficients (Kd values) of >200,000 L kg(-1). Phillipsite was more effective than apatite at sorbing aqueous Ba2+. Results from the laboratory study were used to design the greenhouse study that used a soil affected by a Zn-Pb smelter from Pribram, Czech Republic. Two application rates (25 and 50 g kg(-1)) of phillipsite and apatite and two plant species, maize (Zea mays L.) and oat (Avena sativa L.), were evaluated in this study. There was little (maize) to no (oat) plant growth in the unamended contaminated soil. Apatite and, to a slightly lesser extent, phillipsite additions significantly enhanced plant growth and reduced Cd, Pb, and Zn concentrations in all analyzed tissues (grain, leaves, and roots). The sequestering agents also affected some essential elements (Ca, Fe, and Mg). Phillipsite reduced Fe and apatite reduced P and Fe concentrations in oat tissues; however, the level of these elements in oat leaves and grains remained sufficient. Sequential extractions of the soil indicated that the Cd, Pb, and Zn were much more strongly sorbed onto the amended soil, making the contaminants less phytoavailable.

Adsorption↗