Roczniki Państwowego Zakładu Higieny
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Rocz Panstw Zakl Hig · Jan 2000
[Contents of radon 222Rn in drinking water of Sweradów Zdrój and Czerniawa Zdrój].
Radon-222 concentration in surface water, wells and tap water in Swieradów Zdrój and in Czerniawa Zdrój has been quantitative determined. The measurements were performed using the alpha liquid scintillation counting method. Radon arithmetic mean for water of individual wells in Swieradów Zdrój was found to be 438.5 Bq/l within the range between 42 Bq/ and 1095 Bq/l. ⋯ Waterworks in Czerniawa Zdrój is supplied with the surface water in which the radon concentration is low (about 2 Bq/l). Water works in Swieradów Zdrój is supplied with the mixed water consisting from the surface water, which main characteristic is low radon concentration (below 11 Bq/l), and from artesian well and mine gallery water with the radon concentration from 321 Bq/l to 464 Bq/l in it. This water is mixed in various ratios and therefore the radon concentration in it was within 4 Bq/l and 79 Bq/l.
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Fat content as well as fatty acids composition in 46 chocolate both stuffed and hard type as well as 14 chocolate related products from the market in Warsaw area in the years of 1997-1999 has been analysed. As the result of above investigations the considerable difference in fat content (from 6.6 to 40.0%) as well as fatty acids groups has been detected, in particular in stuffed chocolates and chocolate products.
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Rocz Panstw Zakl Hig · Jan 1997
[Evaluation of the combined effect of lead and sodium nitrite on some blood biochemical parameters in blood of rats during subchronic exposure. Influence on levels of methemoglobin, sulfhydryl groups and tryptophan].
The study was performed on 4 groups of male Wistar rats, receiving p.o. through 3 months every day: 1) distilled. water (control group); 2) sodium nitrite in dose 30 mg/kg b.w. x day (20% LD50); 3) lead acetate in dose 10 mg/kg b.w. x day (6.7% LD50); 4) lead acetate and sodium nitrite in amounts as above. The methemoglobin and hemoglobin were determined in whole blood, tryptophan--in plasma and free sulfhydryl groups--in erythrocytes. ⋯ Both nitrite and lead significantly decrease free sulfhydryl groups and tryptophan levels in blood. There was also observed that lead administrated together with sodium nitrite does not increase methemoglobin concentration.
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The purpose of the study was to assess the effects of various pipelines on drinking water quality. For the study carried out in Warsaw buildings were chosen in which the installations were made of polypropylene, polyvinyl chloride, copper and steel. Water samples were taken from the sites of water leading to the buildings and from the highest floors, if possible. ⋯ The hydro-biological testing of water samples included quantitative and qualitative analysis of macroscopic and microscopic plant and animal organisms. All studies were carried out according to Polish Standards and the methods of the State Institute of Hygiene. The results of the physicochemical, bacteriological and hydro-biological tests failed to show any effect of the material of pipelines on the quality of drinking water in the range of the determined parameters.
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Rocz Panstw Zakl Hig · Jan 1991
Comparative Study[Changes in psychophysical load of high school students as a result of educational reform].
The material comprised 2679 secondary school pupils (1959 girls and 1020 boys) from several Polish big cities, among whom 1281 pupils took up the old school program and 1968--the new program. The present studies were initiated in school year 1985/86 and were completed in 1989/1990. The psychophysical load of pupils was evaluated by means of a standard questionnaire comprising 77 questions grouped into problems, allowing us to determine the pupil's psychophysical load associated with school education, extra school occupations, daily time-table, situation in the class and family as well as psychic general feeling. ⋯ After the educational reform, the load was heaviest in the second class of secondary school. The psychophysical load of girls exceeded that of boys. Likewise, the loads associated with the objectively prevailing load-causing situations as well as those associated with subjective feeling of the burden of these loads were heavier in girls than in boys, both before and after the introduction of changes in school programs.