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201.
Tauhata L Vianna ME de Oliveira AE Ferreira AC Bragança MJ Clain AF de Faria RQ 《Journal of environmental radioactivity》2006,86(3):384-390
The Instituto de Radioprote??o e Dosimetria has been coordinating the National Intercomparison Program (PNI) for 15 years, from 1991 to 2005. The objective is to evaluate the analytical performance of the laboratories in low-level activity concentration radionuclide assays in environmental samples. This work presents an evaluation of PNI data from 42 intercomparison runs, which distributed to 22 Brazilian laboratories 2511 samples evaluating 5768 radionuclide assays involving 32 radionuclides in the period from 1991 to 2004. The laboratory performance was evaluated using the Normalized Standard Deviation used by the U.S. EPA. For comparison aims, the Normalized Deviation, used by BIPM was also applied. Laboratory performance were grouped and evaluated in three periods of 5 years each. The first period shows, an average value of good performance of 71.2%, the second shows an average of 78.6% and the last an average of 82.3%. Performance for each kind of radionuclide is also presented. 相似文献
202.
203.
Lisbeth M. Ottosen Eduardo Arevalo Heinz Stichnothe Wolfgang Calmano 《Environmental Chemistry Letters》2006,3(4):164-168
Wastewater from wash down of boat hulls contains typically Cu, Zn and organometallic biocides, e.g. tributyltin (TBT). In
some cases this wastewater is led directly into the marine system. In the present paper, a cheap flocculation method (iron
flocculants) for removal of Cu and Zn from the wastewater is investigated and the method was shown successful. TBT concentration
in a sample from a German dockyard was also decreased during flocculation, but the TBT removed was already associated with
small particulates in the original sample. Low concentrations of heavy metals were obtained by flocculation: <0.05 mg Cu/l
and 0.2 mg Zn/l.
An erratum to this article can be found at 相似文献
204.
205.
Aichi virus 1 genomes were detected by quantitative PCR in groundwater from shallow dug (10/22) and tube wells (1/15), river water (14/14), and sewage (1/1), with the maximum concentration of 4.0 × 109 copies/l. Nucleotide sequencing analysis demonstrated the prevalence of genotype B in the virus positive samples. 相似文献
206.
Vázquez S Hevia A Moreno E Esteban E Peñalosa JM Carpena RO 《Journal of environmental management》2011,92(8):2069-2075
Non-amended soils affected by pyritic sludge residues were monitored for 7 years to assess the long-term natural attenuation ability of these soils. The decrease in both the total concentration of elements (particularly As) and (NH(4))(2)SO(4)-extractable fractions of Mn, and Zn, below the maximum permissible levels indicate a successful natural ability to attenuate soil pollution. Soil acidification by pyrite oxidation and rainfall-enhanced leaching were the largest contributors to the reduction of metals of high (Mn, Cu, Zn and Cd) and low (Fe, Al, and As) availability. Periodic use of correlation and spatial distribution analysis was useful in monitoring elemental dispersion and soil property/element relationships. 相似文献
207.
208.
The influence of silicon on responses to copper excess was studied in plants of Erica andevalensis. Plantlets were grown in nutrient solutions containing two Cu (1 and 500 μM) and three Si concentrations (0, 0.5 and 1 mM). Plant growth, water content, and mineral nutrient concentration were determined. Plants grown with 500 μM Cu showed differences in growth and shoot water content depending on Si supply. The addition of 1 mM Si in high-Cu nutrient solutions significantly improved plant growth and reduced water loss preventing plant death related to Cu-excess. Silicon supply reduced significantly leaf Cu concentration (up to 32%) and increased Cu concentration in roots. Phytoliths isolated from leaves were analysed by scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. Such phytoliths consisted in silica deposits associated with Cu and other elements (K, Ca, P). Improvement by Si of Cu tolerance in E. andevalensis was clearly related to the inhibition of Cu upward transport. The leaf phytoliths formed in Si-treated plants might have some contribution to tolerance by Cu immobilisation and inactivation. 相似文献
209.
Marson Eduardo O. Paniagua Cleiseano E.S. Costa-Serge Nayara M. Sousa Raquel M.F. Silva Gizele D. Becker Raquel W. Sirtori Carla Starling Maria Clara V. M. Carvalho Solidônio R. Trovó Alam G. 《Environmental science and pollution research international》2021,28(19):23582-23594
Environmental Science and Pollution Research - As the presence of antibiotics in environmental waters enhances antimicrobial resistance, photolysis and heterogeneous photocatalysis of... 相似文献
210.
Akira Iguchi Shinpei Takai Masahiro Ueno Tsuneo Maeda Takashi Minami Isao Hayashi 《Marine Biology》2007,151(1):31-39
The population structures of Buccinum tsubai and Neptunea constricta were compared using partial sequences of the mitochondrial COI gene. B. tsubai included four genetically distinguishable subpopulations (Hokkaido, Yamagata-Toyama, Yamato Bank, and San’in), which is consistent
with the results of our previous study using mitochondrial 16SrRNA sequences. The genetic structure of N. constricta was also clear, but the lineage sorting corresponding to the geographical distribution was not as clear as that of B. tsubai. The difference between the genetic structures of these two species might be due to a difference in either their dispersal
abilities or the historic distribution patterns in the Sea of Japan. The fossil record and nested clade analyses support the
latter alternative. The four subpopulations of B. tsubai are estimated to have diverged 0.42–1.46 million years ago, providing support for the existence of intermediate water of
normal salinity and oxygen concentration capable of sustaining B. tsubai between the low-salinity surface water and anoxic deep water during the Pleistocene glacial periods. The genetic diversity
of the Yamato Bank subpopulation of B. tsubai was lower than that of the other subpopulations, which is likely attributable to the small size of the Yamato Bank subpopulation. 相似文献