Exposed Or Not Exposed The Effectiveness Of Using Tracers To Verify Exposure Of Fish To Pulp And Paper Mill Effluent

Author: Canada. Department of Fisheries and Oceans
Publisher: Burlington, Ont. : Fisheries and Oceans Canada
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Amendments to the federal Pulp & Paper Effluent Regulations (1992) required pulp and paper mills to conduct an environmental effects monitoring (EEM) program to determine if fish, fish habitat, and utilization of the fisheries resource ...

Gravel Bed Rivers

Author: Michael Church
Publisher: John Wiley & Sons
ISBN: 0470688904
Size: 55.99 MB
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Open symbols indicate exposed tracers and closed symbols indicate buried
tracers. Competent flow duration was estimated using published information
about flow duration exceedence frequency in Allt Dubhaig and an individual
hydrograph analysis in Carnation Creek. Published values taken from Hassan (
1990), Haschenburger (2011), and Lenzi (2004), plus original observations for
Allt Dubhaig (R. Ferguson, pers. comm., 2010). Figure 5.4 Exchange probabilities
based on a ...

Isotope Tracers In Catchment Hydrology

Author: Carol Kendall
Publisher: Elsevier
ISBN: 9780444501554
Size: 76.79 MB
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The most commonly applied nuclides for erosion rate measurements are 3He, l°
Be, 26Al and 36Cl. Until recently, use of these nuclides was restricted to
determining denudation rates of exposed bedrock outcrops: recently, several
research groups have begun to measure nuclide abundances in sediments with
the goal of estimating basin-scale rates of denudation. 19.2.1 Cosmogenic
nuclides in exposed outcrops The abundance of a cosmogenic nuclide in a
sample of outcropping ...

The Use Of Fluorescent Tracers As An Index Of Dermal Exposure To Pesticides

Author: Lowell Ashbaugh
Size: 39.11 MB
Format: PDF, Mobi
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The following factors were felt to be requirements for a suitable tracer : 1. Toxicity-
the material must be non-toxic in terms of dermal, respirable, and gastro-
intestinal exposure. 2. The tracer must be of a similar nature to pesticide in terms
of dermal exposure mechanism; i.e. the transfer properties of the tracer from
foliage to worker must be similar to those of pesticide. 3. The tracer must not
change fluorescence intensity over time, or when exposed to environmental
variables such as ...

Tracer Hydrology 97

Author: A. Kranjc
Publisher: CRC Press
ISBN: 9789054108757
Size: 16.96 MB
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Young daphnia magna are exposed to different dye concentrations prepared with
artificial sweet water. After 24 hours and 48 hours the number of flea that are
unable to swim is evaluated. The pH value and the content of the oxygen is
controlled during the experiment. 3 RESULTS The presented toxicological results
for different tracers are subdivided into human toxicology and ecotoxicology. 3. 1
Human toxicology Fluorescein, as noted above, is widely used in medicine,
where it is ...

Isotope Tracers In Metabolic Research

Author: Robert R. Wolfe
Publisher: John Wiley & Sons
ISBN: 9780471462095
Size: 47.78 MB
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from the discussions above, no amount of radiation exposure can be considered
“safe.” However, certain limits have been set on the basis of a variety of criteria.
For individuals occupationally exposed, the maximum annual doses to any organ
cannot exceed 5 rem to the red bone marrow, head, trunk, gonads, and lenses of
TABLE 2.2 Risks Related to Specific Radiation Dosages Dosage (rads) Exposure

Occupational Hazards Of Pesticide Exposure

Author: Donald J. Ecobichon
Publisher: CRC Press
ISBN: 9781560327066
Size: 75.66 MB
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Basically, images of exposed subjects were analyzed by measuring the mean
fluorescence intensity of tracer deposits on the skin using the standard curve to
convert the gray value or l.s.b's to a mass per pixel or per cm2, which then was
multiplied by the area of the deposit to obtain the mass of tracer per deposit. The
masses of all deposits were summed to determine the total mass of tracer on the
subjects' skin. Interpolation was used to calculate quantities lying between
calibration ...

Isotopic Tracers In Biology

Author: Martin D. Kamen
Publisher: Elsevier
ISBN: 1483274330
Size: 20.38 MB
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... Ruben, in collaboration with Hassid and Kamen," began experiments using the
short-lived carbon isotope C" (half-life, 20.5 min.). The plan of research was
simple. Green plants or algae, actively photosynthesizing CO2, were exposed to
tracer quantities of the gas labeled with C". At various times, determined by the
nature of the experiment, the plants were killed by boiling in ethanol or water. The
resulting suspension was fractionated, and the fractions were assayed for

Safe Use Of Radioactive Tracers In Industrial Processes

Author: R. Cunningham
Size: 41.35 MB
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Exposing this hypothetical group to this Derived Working Limit (DWL)
continuously for one year would give a dose commitment equal to the relevant
Dose Limit. If the concentration of radionuclides in liquid and gaseous effluents
from a tracer investigation at the point of release from the controlled area is well
within these values of uncontrolled areas, persons designing the tracer
investigations would not ordinarily need to calculate the expected radiation dose
to members of the public.