Wyniki wyszukiwania - AGRO

1

Exchange of mercury between water and the wall of a vessel and its effect on the results of determinations

100%

Wrembel H. Z.

Oceanologia

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1981

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tom 13

2

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Interactions of mercury in the environment

100%

Maluszynska I., Popenda A., Maluszynski M. J.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2013

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tom 45

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nr 2

Mercury is a pollutant of global concern largely due to its potential for biological transformation into harmful forms and bioaccumulation through the food chains. Mercury is not able to biodegrade in the environment and it forms many toxic inorganic and organic complexes. The strongest harmful effects of mercury concerns the central nervous system. The harmful effects of mercury is very stable, because the mercury compounds bind to enzymes. Getting into the brain, mercury displace zinc from brain tissue, and thus reduces the effi ciency of the brain. Then excreted in the cell nuclei and destroys the genetic material. The antagonism between zinc and mercury partially modifies its toxic effects. Mercury is combined with active groups of proteins and amino acids, accumulating in the body. Selenium has similar affinity, limiting connects these groups with mercury, reducing its toxicity. Antagonists are also cadmium, mercury and zinc, but their effects are most likely related with the action of selenium. Antagonist for mercury is also iodine content in the thyroid gland which is lowered, the excessive concentration of mercury in the body. It is known that taking selenium, zinc and thiols, e.g. GSH and NAC, are of prime importance in considering effects on human organisms as well as the level of its excretion. Due to the fact that interactions are dynamic and poorly understood at present the better understanding of their role requires the further studies. Despite that have been identifi ed interactions between elements and mercury, limiting its toxic effects, we still do not have sufficient knowledge about how to reduce the negative effects of this element on the human body. The definition of what is an acceptable daily dose of mercury for humans also does not quarantee protection of the health, because we do not know the exact limits of tolerance for different follow-up effects of prolonged exposure to low concentrations. It should also be pointed out that the interactions are dynamic and weakly understood at present. The better understanding of the role the afore-mentioned particles may be crucial in the to study the interaction between mercury and various environmental components and to find a substance that interacts with mercury to reduce its toxicity to living organisms.

3

Mercury in surface sediments associated with shipyard activity in the city of Gdansk

100%

Falandysz J.

Polish Journal of Environmental Studies

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1999

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tom 08

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nr 4

The aim of the present work was to elucidate if a long tradition of the shipyard activity has an influence on a status of mercury contamination of the surface sediments and port watercourse of the city of Gdansk. Concentrations of total mercury (Hg) were determined in surface (0-10 cm) sediments collected from the area of the shipyard canals in the city of Gdansk in 1996. Only a relatively small variations in spatial distribution of mercury in surface sediments examined were found, and the range of concentrations was from 300 to 1300 ng/g dry weight. Despite of relatively high mercury concentrations determined in surface sediments examined the overall range of the values was of the same order of magnitude as indicated earlier in samples collected from the Old Motlawa River and the Dead Vistula River Channel (Martwa Wisla) from the administrative area of the city of Gdansk in 1993-1995. The results did indicate that the shipyard activity doesn't has any impact on mercury load of the sediment in surrounding canals. The source of pollution with mercury in the canals investigated can be a storm water washing out various surfaces both from the urbanised area and including the shipyards of the city of Gdansk.

4

Determination of antimony in soil samples by flow-through stripping chronopotentiometry with a microporous mercury-film electrode

86%

Manova A., Strelec M., Beinrohr E.

Polish Journal of Environmental Studies

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2007

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tom 16

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nr 4

607-611

Flow-through stripping chronopotentiometry was used for the determination of antimony in soil samples. Antimony was deposited in potentiostatic mode on a glassy carbon porous electrode coated with Nafion® and mercury and then stripped with constant current. The accuracy of the results was confirmed by graphite furnace atomic absorption spectrometry. The LOD and LOQ were found to be 0.6 ^g dm-3 and 1.7 ^g dm-3, respectively. A linear response range was observed in the concentration range of 1 to 200 ^g dm-3 for sample volumes of 4 ml. The repeatability and reproducibility were found to be 2.9% and 5.2%, respectively.

5

Mercury fluxes through the sediment water interface and bioavailability of mercury in Southern Baltic Sea sediments

86%

Beldowski J., Miotk M., Pempkowiak J.

Oceanologia

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2009

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tom 51

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nr 2

263-285

Sediment cores collected in several areas of the southern Baltic were analysed for total mercury (HgTOT) and five operationally defined mercury fractions: HgA – contained in pore waters, HgF – bound to fulvic acids, HgH – bound to humic acids, HgS – bound to sulphide, and HgR – residual. An effort was made to quantify mercury fluxes at the sediment/water interface in the study area. Net mercury input, calculated on the basis of sedimentation rate and concentration in the uppermost sediments, ranged from 1 to 5.5 ng cm−2 year−1. Mercury remobilisation from sediments due to diffusion and resuspension was calculated from the proportion of labile mercury and the velocity of near-bottom currents. The results showed that the return soluble and particulate fluxes of mercury from the sediments to the water column constitute a substantial proportion of the input (20–50%), and are slightly higher than those found in pristine areas, although they are less than the values recorded in areas with a history of mercury contamination. In addition, an index was developed to assess the methylation potential of mercury in sediments. Mercury contained in pore waters, and mercury bound to fulvic and humic acids together with Loss on Ignition were used to calculate the semiquantitative methylation potential (Pm). Despite the simplicity of this approach, Pm correlates well with methyl mercury in fish from the study area.

6

Transport of iodine and mercury contained in submicronic aerosol particles over relatively clean seas (the Antarctic) and polluted ones (the Baltic)

86%

Felkier L., Garbalewski C.

Oceanologia

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1984

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tom 19

7

A study of the complexation reaction of mercury (II) with rhodarnine B from the point of view of its utilization in assaying mercury by the luminescence method

86%

Trojanowski J., Ston M., Szmacinski H.

Oceanologia

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1981

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tom 13

8

The determination of mercury at ultramicrotrace levels in water using the low-pressure ring discharge

86%

Wrembel H. Z.

Oceanologia

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1981

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tom 13

9

Mercury contamination of railway areas in South-East Poland

86%

Jozwiak M., Jozwiak M. A.

Rocznik Świętokrzyski. Seria B. Nauki Przyrodnicze. Kieleckie Towarzystwo Naukowe

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2013

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tom 34

10

Mercury induced oxidative stress of antioxidants in Clitoria ternatea L.

86%

Priya M., Balakrishnan V., Kiruthika Lakshmi A., Aruna R., Ravindran K. C.

International Letters of Natural Sciences

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2014

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tom 18

Biofertilizers are the special formulation of specific beneficial microorganisms that promote the growth of plant crops by converting the unavailable form of nutrients into available form. Here, the effect of heavy metal stress on antioxidant enzymes were studied in Clitoria ternatea L. leaves. Clitoria ternatea L. plant was grown for 30 days and the heavy metal mercuric chloride was sprayed after 10 days from the date of planting. Effect of mercuric chloride was observed in treated plants. The selected plant Clitoria ternatea L. was grown under mercuric chloride treatment in a specified concentration 1 μg/10 ml. The control plant maintained without the treatment of mercuric chloride. Antioxidant effect of mercuric chloride was measured under controlled and treated conditions. The selected plant Clitoria ternatea L. was grown under mercuric chloride in treatment. Further it increases H2O2 content and the antioxidant enzyme activities such as superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) were observed in mercuric chloride treated plants when compared with control. Here mercuric chloride was accumulated more in matured leaves. The results are discussed with the literature.

11

Interaction between mercury and macro- and microelements in animals

86%

Kossakowski S., Grosicki A.

Polish Journal of Environmental Studies

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1996

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tom 05

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nr 3

We have reviewed available data from our and other laboratories relevant to the effects of single and repeated intoxication with mercury on the metabolism of several elements in animal bodies. Additionally, emphasis has been placed on the influence of zinc and selenium on mercury toxicity. The data indicate that mercuric chloride and methyl mercury affect quite differently the distribution pattern and concentrations of trace elements in animal organs. Moreover, it should be stressed that mercury intoxication decreases bone radiocalcium and thyroidal radioiodine levels which correlated with the size of mercury doses. The disturbances were chiefly attributed to impairments of the gastrointestinal absorption in mercury intoxicated rats. Moreover, haemodynamic alterations and mercury trace ele- ments-metallothionein complexes may also result in these disturbances. The effect of zinc on mercury toxicity is not uniquivocal. In contrast, the ability of selenium to decrease mercury's deleterious effect in animals is well recognised.

12

Mercury toxicity to Chlorella vulgaris Beijerinck: protection by amino acids

86%

Mohanty L., Mohapatra D. K., Mohapatra P. K., Mohanty R. C.

Polish Journal of Environmental Studies

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1998

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tom 07

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nr 1

Mercury is known to be toxic to a number of phytoplankton even at very low concentrations. The metal inhibited survival, growth and biosynthesis of chlorophyll, carbohydrate and lipid of the green alga Chlorella vulgaris at its toxic concentrations (≥ 0.1 μM), but induced the biosynthesis of proline. The addition of amino acids (Alanine, Aspargine, Glutamate, Histidine and Cysteine) to the growth medium had a significant impact on bioassay results. The toxicity was expressed differently depending on concentration and type of amino acid added to cultures. LC50s ranged from 0.68 ± 0.004 to 0.97 ± 0.008 μM and the acute toxicity of Hg2+ in amino acid supplemented media followed the order C > C + ALA > C + GLU > C + ASP > C + HIS > C + CYS. The static dose of the metal to the alga was found to be 1 + 0.006 μM but its inhibitory effect on the alga was drastically reduced with the addition of amino acids. There were positive correlations between growth and metabolic activities of the alga and concentration of amino acid added to cultures at the presence of static concentration of Hg2+. The results suggested that amino acids have moderating effects on toxicity of Hg2+ because of their ability to regulate the concentration of free Hg2+ ions in growth medium.

13

Comparison of some wet decomposition methods for mercury determination in industrial waste

86%

Ciba J., Kluczka J., Zolotajkin M.

Archiwum Ochrony Środowiska

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2002

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tom 28

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nr 4

14

Total gaseous mercury over the coastal zone of the Gulf of Gdansk

86%

Beldowska M., Falkowska L., Marks R.

Oceanological and Hydrobiological Studies

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2003

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tom 32

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nr 3

15

Distribution of mercury and other heavy metals in bottom sediments of the middle Odra River [Germany-Poland]

86%

Boszke L., Sobczynski T., Glosinska G., Kowalski A., Siepak J.

Polish Journal of Environmental Studies

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2004

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tom 13

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nr 5

The Odra is the second largest river in Poland, running from the Czech Republic through a large part of Poland before entering the Baltic Sea. Its catchment area has been heavily polluted by anthropogenic emissions. Our data document an intensive anthropogenic impact on the abundance of heavy metals in bottom sediments of the middle part of the Odra. Normalized heavy metal concentrations in sediments and indices of geoaccumulation (Igeo) indicate that this area is polluted by various metals, especially mercury, cadmium and zinc. The ranges of their concentrations vary as follows: Hg 0.12-2.99 mg/kg, Cd 2.93-7.87 mg/kg, Pb 21.2-163 mg/kg, Cu 11.5-88.3 mg/kg, Zn 28.0-471 mg/kg, Cr 1.57-47.5 mg/kg, Ni 5.10-19.1 mg/kg, Fe 1493-37972 mg/kg and Mn 47.6-1242 mg/kg.

16

Suicide attempt via intravenous injection of elemental mercury. A case report and review of the literature

86%

Andel M., Broz J., Cikrt M., Cabelkova Z., Kocher M., Kratochvil A., Linkova H., Lukas E., Nerudova J., Pospisil V., Svanda J., Tesinsky P., Tosnerova T., Urban P., Vlachova A.

Acta Toxicologica

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2005

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tom 13

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nr 1

17

Total mercury concentrations of wild edible mushrooms of the Borecka Forest and the adjacent area

86%

Falandysz J., Monkiewicz E., Klawikowska K., Gucia M.

Polish Journal of Food and Nutrition Sciences

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2001

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tom 10

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nr 1

The total mercury concentrations of eleven species of common edible wild mushrooms of the genus Suillus, Xcrocomus, Boletus, Leccinum, Suillus, Annillariella, Russula, Lactarius and Lycoperdon collected from the Borecka Forest and the adjacent area in 1998 were determined by the cold-vapour flameless atomic absorption spectroscopy (CV-AAS). In total, 382 pooled samples of the caps and stalks, and 16 pooled samples of the whole fruiting bodies were examined. The total number of the fruiting bodies was 804. The mercury concentration varied depending on the species and site investigated. The fruiting bodies of King Bolete Boletus edulis showed the highest contamination with mercury. The caps of King Bolete and Yellow-cracking Bolete Xcrocomus subtomentosus collected from the potentially unpolluted region of the Borecka Forest were around threefold more contaminated with mercury than the specimens originating from its surrounding area, i.e. 9900±2700 and 3600±1400, and 480± 190 and 160±70 ng/g dry weight, respectively. Apart from the King Bolete relatively elevated concentrations of mercury were quantified also in whole fruiting bodies of Common Puffball Lycoperdon perlatum, i.e. 3400±1300 ng/g and in the caps and stalks of Common Scaber Stalk, i.e. 1200±740 and 1100±380 ng/g d.w., respectively. In the case of other species investigated, the mercury concentrations were below 1000 ng/g d.w., and the lowest values were found for Crab-scended Brittle Gills Russula xerampelina, i.e. 60±20 and 40±20 ng/g d.w. in the caps and stalks, respectively. For the Larch Bolete, Bay Bolete, Yellow-cracking Bolete, King Bolete, Common Scaber Stalk, Honey Mushroom, Crab-scented Brittle Gills and Safron Milk Cap there was a positive correlation (p<0.05) between the mercury content and size (diameter) of the caps, and for some cases also between the mercury content of the stalks and the size (height) of the whole fruiting body. King Bolete and Common Scaber Stalk are among the most popular wild edible mushrooms traditionally picked-up in Poland and the data obtained suggest the possible health risk for the local consumers and consideration of establishing the mushrooms consumption advisory.

18

Mercury fractionation in sediments of the Lower Vistula River [Poland]

86%

Boszke L., Kowalski A.

Oceanological and Hydrobiological Studies

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2007

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tom 36

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nr 3

19

Total mercury content as a function of length in fish from the southern Baltic

86%

Polak-Juszczak L., Sobolewska A.

Bulletin of the Sea Fisheries Institute

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1999

|

nr 1

20

Bioindication of mercury by aquatic bryophytes

86%

Samecka-Cymerman A.

Biological Bulletin of Poznań. Supplement

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1996

|

tom 33

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