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Biomedical subjects

L Chadzynski

Publications and source records attributed to L Chadzynski.

13 recordsLinked to original sources
PubMed1996

Potential public health risks related to mercury/amalgam discharge from dental offices.

Mercury is a toxic and bioaccumulative metal. It exists in elemental, inorganic and organic forms. The use of mercury by the dental profession represents approximately 6 percent of the total annual domestic consumption and is estimated to contribute significantly to the discharge of mercury (14 percent in one study) to waste-water streams. Publicly owned treatment works (POTW) must obtain and comply with a National Pollutant Discharge Elimination System waste-water discharge permit. When minimal mercury discharge limits into surface waters are exceeded, an upstream search for contributors of mercury to the waste stream may result. Given the present sociopolitical environment, mercury discharge from dental offices will increasingly receive scrutiny. Strategies to minimize discharge of mercury/amalgam waste include engineering controls such as changes in the discharge process, changes in the composition of commercial products, and changes in control equipment. Governmental strategies include an outright ban, the setting of discharge standards, and educational efforts. Study of these strategies with evaluation of effectiveness is needed.

Dental Amalgam↗
PubMed1990

Measurement and impact of agricultural odors from a large scale swine production farm.

With the move on a nationwide scale to greater centralization and specialization of swine production and consequent swine confinement, rural communities face the prospects of increasing odor impact from these sources. The enactment of regulations to prevent community odor nuisance requires the establishment of limits to reflect emissions which may be found to exceed such community standards. While urban industrial sources of odor such as rendering plants and coke ovens are required to meet source emission limits as a result of citizen complaint related litigation, agricultural sources are, in most states, exempt from such legal restrictions. However, should a burden of nuisance complaints come into evidence, data showing individual source emission measurements of these new upscaled livestock facilities as odor sources is of great importance. This study of a 50,000 animal swine-growing facility show that the greatest odor impact originates from the gestation buildings (1,200,00 ou/min), nursery buildings (630,000 ou/min) and field sprinklers (334, 156 ou/min). As shown by a comparison of urban odor source related citizen complaint data versus source measurement results and types of successful abatement actions on an urban scale, an air scrubber system to serve these buildings together with the substitution of ground injection to replace field sprinkling of liquid waste would be expected to achieve the improvement in odor control comparable to urban industrial sources with similar reduction or elimination of odor complaints.

Air Pollution↗
PubMedDate not supplied

An investigation of elevated blood lead levels in Detroit children.

The findings of this report are based on data from 1309 children living near three heavily traveled streets in Detroit. This study was designed to determine the most probable reasons for elevated blood lead levels in young children. The authors used a linear multivariate regression to evaluate the effects of distance from the highway, age and sex of the child, and housing condition. The authors found that the distance the child lived from the highway did not have a measurable affect on blood lead level. Housing condition played the most important role in determining blood lead level. Poorer housing caused a higher average blood lead level and caused the blood lead distribution to skew, giving a significantly greater number of blood leads over 40 micrograms/100 ml. Age also was important in determining blood lead level. There was a decrease of about 1 micrograms/100 for each increase of one year in the child's age. Sex also appeared to play a small role. In all three areas of the study, blood lead levels were slightly higher in girls than in boys. This study shows, as many have before, that the primary cause of the lead problem with children can be greatly diminished by improved housing.

Age Factors↗