Wyniki wyszukiwania - BazTech

1

Distribution and sources of n-alkanes in surface sediments of Taihu Lake, China

Yu Y., Li Y., Guo Z., Zou H.

Archives of Environmental Protection

|

2016

|

Vol. 42, no. 1

49--55

EN

The last study on n-alkanes in surface sediments of Taihu Lake was in 2000, only 13 surface sediment samples were analysed, in order to have a comprehensive and up-to-date understanding of n-alkanes in the surface sediments of Taihu Lake, 41 surface sediment samples were analyzed by GC-MS. C10 to C37 were detected, the total concentrations of n-alkanes ranged from 2109 ng g−1 to 9096 ng gg−1 (dry weight). There was strong odd carbon predominance in long chain n-alkanes and even carbon predominance in short chain n-alkanes. When this finding was combined with the analysis results of wax n-alkanes (WaxCn), carbon preference index (CPI), unresolved complex mixture (UCM), hopanes and steranes, it was considered that the long chain n-alkanes were mainly from terrigenous higher plants, and that the short chain n-alkanes mainly originated from bacteria and algae in the lake, compared with previous studies, there were no obvious anthropogenic petrogenic inputs. Terrestrial and aquatic hydrocarbons ratio (TAR) and C21−/C25+ indicated that terrigenous input was higher than aquatic sources and the nearshore n-alkanes were mainly from land-derived sources. Moreover, the distribution of short chain n-alkanes presented a relatively uniform pattern, while the long chain n-alkanes presented a trend that concentrations dropped from nearshore places to the middle of lake.

2

Wpływ budowy geologicznej i ukształtowania terenu na historyczne i współczesne inwestycje inżynierskie i budowlane w Lublinie

Mroczek P.

Przegląd Geologiczny

|

2014

|

Vol. 62, nr 10/2

645--653

EN

The first geological and engineering investments in Lublin related to the defense and the isolation of the castle can be dated back at least 700 years. Today, the oldest ones among them are documented only during archaeological excavations in the areas of hills/promontories in the eastern edge of loessic Na³êczów Plateau, steeply sloping down to the valley of Bystrzyca River. Over the centuries, the growing town, required number of investments conditioned by the geology (surface rocks) and relief. The city expanded to the areas of different in geology and topography. As a result of geotechnical works, implemented over several hundred years, modern Lublin is the town that could boast a number of multiage and diverse geotechnical objects. These are primarily objects designed to serve the defense, streamlining communication and also widely understood economy.

3

Hydrochemiczne konsekwencje zasilania zbiorników przepływowych wodami zanieczyszczonymi

Jaguś A., Rzętała M.

Rocznik Ochrona Środowiska

|

2012

|

Tom 14

632--649

EN

The research concerned flow-through reservoirs fed with contaminated river water. The aim of the research was to recognize the impact of reservoirs on fluvial transportation of contaminants. Three reservoirs, situated in the Upper-Silesian region (southern Poland) and operating in different environmental conditions, were selected for the research: Pogoria I reservoir - operating in the quasi-natural direct catchment (with fluvial load of industrial-municipal wastewater), Przeczyce reservoir - under agricultural anthropopressure, and Dzierzno Due reservoir - under urban-industrial anthropopressure. The research included analyses of the quality of river water flowing into and leaving the reservoirs and calculation of contaminant loads at the inflows and outflows. The research showed that Pogoria I reservoir neutralised inflowing contaminants, thus purifying the river water. Nitrogen and phosphorus compounds were particularly efficiently retained. Electrolytic conductance of water in Pogoria was reduced by up to 50%. Przeczyce reservoir was alimented with eutrophic water (especially rich in biogenic elements) from agricultural land. The reservoir accumulated contaminants at the initial stage of the research. After several years, however, it started releasing some of the accumulated substances, causing an increase in contamination of river water with e.g. organic substances. The data concerning Przeczyce reservoir revealed that reservoirs can purify water from some substances and simultaneously cause an increase in contamination with other substances. Selectivity of hydrochemical impact of reservoirs was particularly visible in case of Dzierzno Due reservoir, which received wastewater from the urban-industrial catchment. It largely reduced the loads of suspended matter, phosphates or zinc, among other substances, at the same time causing secondary contamination with substances like ammonia, lead or cadmium. The results of the research show individuality of reservoirs in terms of their impact on fluvial transportation of substances. It might be believed, however, that each reservoir which is fed with contaminated water will have at least partly (selectively) contaminating impact in the course of time. That should be related to increasing eutrophication in conditions of limited capacity of accumulation of contaminants in the limnic environment. Detailed assessment of transfer of substances by a particular reservoir would require individual research for that reservoir.

4

Properties of surface of bottom sediments in the coastal zone of the Gulf of Gdańsk (1994-1995)

Dubrawski R., Witkowska K., Kula A.

Oceanological Studies

|

1998

|

Vol. 27, No. 4

23-47

EN

Results of chemical and granulometric investigations of bottom surface sediments of the near-shore zone - beach and shallow water zone - carried out along cross-shore profiles in the Gulf of Gdansk in the period 1994-1996 are presented. Organic matter, total phosphorus and nitrogen, and carbonate (beach and dune) contents, also pH and the reducing-oxidising potential (Eh), as well as granulo-metric composition of the sediments were determined. The seasonal and spatial changes in sediment composition, relationships between the components, the rate of self-purification and the influence of factors shaping the properties of sediments were defined. It has been found that the sediment environment of the Gulf of Gdansk is in poor condition and that its further degradation is likely to happen.