LĖVENS UPĖS TARŠOS TYRIMAS Karalius, Ovidijus; Tričys, Vaclovas
Jaunųjų Mokslininkų Darbai,
12/2018, Letnik:
48, Številka:
2 (48)
Journal Article
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The article aims to investigate the Lėvens river water quality. Authors analyse the surface water protection issues in scientific literature. Moreover, provide knowledge about the condition of the ...Lėvens river. In addition, the article aims to calculate the quantities of pollutants from the Svalia river to the Lėvuo river and select the Lėvens on the river which was 10 points. Water samples are taken and tested: water temperature, pH, amount of suspended matter, dissolved oxygen content, biochemical oxygen consumption in 7 days, ammonium nitrogen, total nitrogen, nitrate, and total phosphorus and phosphate concentrations. The study was conducted on one occasion: the first time the samples were taken in April. In analysed water examples pH varied from 7,53 to 8,01. The concentration of the suspended matter in suspension water samples ranged from 8,9 mg/l up to 17,6 mg/l and has not been exceeded by one. The total nitrogen concentration in the samples ranged from 3,89 mg/l to 4.38 mg/l. The concentration of total nitrogen has exceeded all points in the river. The capped maximum nitrate concentration reached 2.47 mgN/l. Nitrate concentrations in other investigated rivers range from 1.37 mgN/l to 2.23 mgN/l, but the limit values do not exceed. The highest concentrations of total phosphorus in the Levuo river are found in the mouths of the Svalia river. The permissible concentration limit value exceeded 0.059 mgP/l. According to the results of the samples obtained by comparison with Pasvalio city administrative division monitoring, the Levens river condition evaluated at medium.
GAMA RADIACINIO FONO TYRIMAI ŠIAULIUOSE Vaičys, Edvinas; Klimas, Robertas; Tričys, Vaclovas
Jaunųjų Mokslininkų Darbai,
12/2018, Letnik:
48, Številka:
2 (48)
Journal Article
Recenzirano
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In the article, the authors identify sources of ionizing gamma radiation, their types, possible exposure to humans and the environment. In addition it discusses the external and internal exposures of ...natural origin. The most important concepts and terms used in radiological measurements are presented. The results of background research on gamma radiation in Šiauliai are analysed. The values of gamma radiation background in town areas, in various buildings and in building materials, and changes in the gamma radiation background in different floors of residential buildings were measured. In addition, the authors measured background radiation values of gamma in water bodies and drinking water in Šiauliai city. In the course of the study, the gamma radiation background in Šiauliai city districts varied from 0.07 μSv/h to 0.13 μSv/h. Gamma radiation background values can depend on the soil composition and the works carried out in previous years. Measurement data is systematized and visually presented. It has been established that the gamma radiation values in the investigated residential houses, materials and drinking water did not exceed the permissible exposure doses established in hygiene norms. The paper presents conclusions about gamma radiation background research results.
