heavy metal contamination of soil pdf
Heavy metal contamination in soils of urban highways (comparision between runoff and soil concentration
Ngày tải lên :
16/03/2014, 00:25
... 6 62 30
HEAVY METAL CONTAMINATION IN SOILS OF URBAN HIGHWAYS 309
Figure 4. Cluster analysis.
Figure 5. XRD pattern of XS1 taken from 1–5 cm depth.
HEAVY METAL CONTAMINATION IN SOILS OF URBAN ... location of Cincinnati and the positions of sampling stations (After Sansalone et al., 1998).
HEAVY METAL CONTAMINATION IN SOILS OF URBAN HIGHWAYS 311
TABLE VI
Amount of metals in the runoff compared ... much from metal parts of vehicles, which is a
continuing source. Using the event mean concentrations of heavy metals in the run-
off (Table I), which would represent the amount of heavy metal coming...
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Adsorption of heavy metal inons on soils and soil constituents
Ngày tải lên :
15/03/2014, 23:09
... solu-
tion of the model. Often, only a simplified approach is used,
i.e., the acid–base properties of the absorbent in absence of
the heavy metal of interest are determined by titration. Then,
heavy metal ... adsorption
Adsorption of heavy metal ions on soils and soil con-
stituents is influenced by a variety of parameters, the most
important ones being pH, type and speciation of metal ion
involved, heavy metal competition, ... adsorption of heavy metal ions on soils and soils constituents such as clay minerals, metal (hydr)oxides, and soil or-
ganic matter. Empirical and mechanistic model approaches for heavy metal adsorption...
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Báo cáo khoa học: Heavy metal ions inhibit molybdoenzyme activity by binding to the dithiolene moiety of molybdopterin in Escherichia coli pdf
Ngày tải lên :
23/03/2014, 06:20
... incubation mixtures, independent of the
added metal, with an MPT saturation in the range
43–47%. Analysis of the metal content of hSO revealed
that, at a metal concentration of 100 lm, only the
bivalent ... MPT synthase when
metals other than molybdate were added. As metal
analysis of MPT synthase revealed that none of the
metals was inserted into MPT (Fig. 5A), the dithiolene
group of MPT must be ... its metal- free form, and not in the
presence of metal ions (Fig. 5B).
Discussion
Homeostasis of metal ions is a highly regulated com-
plex process in the cell [48]. As a defence against metal
toxicity,...
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Tài liệu Báo cáo " Study on reuse of heavy metal rich sludge in ceramic pigment and construction material production " docx
Ngày tải lên :
12/02/2014, 17:20
... laboratory of
Construction material, Hanoi University of
Construction. The environmental safety of
sludge re-usage was assessed based on heavy
metals leaching after 2, 14 and 21 days of
soaking ... out in the laboratory of Environmental
analysis, faculty of Environmental Sciences and
department of Environmental analysis, Institute
of Environmental Technology.
Heavy metal rich sludge
Dehydration ...
concentration of heavy metal [1-3].
Currently, heavy metal rich sludge is
mainly treated by solidification then
disposed/land filled and incineration. In
addition, some treatment methods for reuse of...
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Tài liệu PATHWAYS OF ORGANIC CHEMICAL CONTAMINATION IN ECOSYSTEMS pdf
Ngày tải lên :
14/02/2014, 09:20
... generations
of pesticides such as organophosphorus pesticides and acetamide pesticides are usually
more specifically targeted in terms of mode of action, and often less persistent.
Organometallic ... – Vol. III – Pathways of Organic Chemical Contamination in
Ecosystems - Padma T. Venkatraman
âEncyclopedia of Life Support Systems (EOLSS)
PATHWAYS OF ORGANIC CHEMICAL CONTAMINATION IN
ECOSYSTEMS ... composed
primarily of aromatic hydrocarbons.
Industrial formulations of pesticides are often mixtures of closely related chemicals. For
instance, commercial formulations of chlordane and technical...
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Báo cáo khoa học: Spectroscopic investigation of the reaction mechanism of CopB-B, the catalytic fragment from an archaeal thermophilic ATP-driven heavy metal transporter potx
Ngày tải lên :
07/03/2014, 00:20
... 2009)
doi:10.1111/j.1742-4658.2009.07320.x
The mechanism of ATP hydrolysis of a shortened variant of the heavy
metal- translocating P-type ATPase CopB of Sulfolobus solfataricus was
studied. The catalytic ... ATP
hydrolysis of the P-type ATPase CopB
We have measured significant basal ATPase activity of
CopB in absence of the heavy metals (M. Zoltner &
M. Lu
ă
bben, unpublished observations). Similarly,
metal- independent ... series of fluorescence titrations
of mant-ATP to CopB-B in the presence of various
competitor concentrations [L
0
], the binding constant of
the nucleotide can be determined from the slope of
the...
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A review of heavy metal removal mechanisms in wetlands
Ngày tải lên :
15/03/2014, 23:06
... release the heavy metals into the
environment with the risk of the metals entering the
food chain. The long term control of heavy metal
pollution control, therefore, lies in the use of other ... shallow rooted
plants were often missing in the highly polluted soils.
He observed that plants that grow near the heavy metal
contaminated areas showed some degree of heavy metal
tolerance. This ... (concentration of metal in dried
portion of plant relative to total concentration in the
soil) are a convenient way of quantifying the relative
differences in bioavailability of metals to plants....
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A meta analysis and risk assessment of heavy metal uptake in common garden vegestable
Ngày tải lên :
15/03/2014, 23:10
... heavy metal uptake (Khan and Frankland 1983).
Soil pH significantly influences heavy metal concentrations in both soil and plant tissues.
The effect of soil pH on mobility of heavy metals ... a Microsoft Excel Spreadsheet
(database). Data extracted included the name of metal, form of the metal, source of the
contamination, dosed concentration, plant type, plant tissue, metal concentration ... addition of lime to
contaminated soils (essentially increasing the pH) decreased the uptake of heavy metals. In
unlimed soils Ambrosia trifida accumulated 13.6 àg Cd g
-1
of tissue and in limed soils...
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Chelant extraction of heavy metal fromcontaminated soils
Ngày tải lên :
15/03/2014, 23:22
... that all of the heavy metals are very tightly bound to the soil; the quantity of
heavy metals leached into solution generally was less than 1.7% of the total heavy
metals contained in the soil sample. ... Enhancements to soil washingr soil flushing
These sets of experiments were aimed at improving the performance of soil
washingrsoil flushing by pretreating the soils before performing soil washingrsoil
flushing ... heavy metal
Ž.
contamination is very high i.e. thousands of mgrkg , the metal sorption capacity of
most soils is exceeded, and the contamination would additionally be present as discrete
wx
metal mineral...
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Chemical partitioning of heavy metal contaminants
Ngày tải lên :
15/03/2014, 23:22
... carbonate fraction of Cu in the present study indi-
Chemical partitioning of heavy metal contaminants in sediments of the Pearl River Estuary20
Table 1 Means and ranges of heavy metal concentrations ... 1993.
Speciation of heavy metals in soils and sediments. An
account of the improvement and harmonization of extrac-
tion techniques undertaken under the auspices of the BCR
of the CEC. Int. J. ...
Chemical partitioning of heavy metal contaminants in sediments of the Pearl River Estuary22
Figure 2 The total heavy metal concentrations in top sediments along the west–east transect of the Pear River...
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ENVIRONMENTAL IMPACT OF HEAVY METAL POLLUTION IN NATURAL AQUATIC SYSTEMS ppt
Ngày tải lên :
23/03/2014, 00:20
... impact of long term applications of heavy
metals to land. Contamination of soils by heavy metals has been reported by
many workers. Metal adsorption is affected by many factors, including soil ... of them being covered by
metal ions of the heavy metal type. Jenne (1968) has noted that there is little
relationship between the cation exchange capacity of soils and the fixation of
heavy metal ... amounts of heavy metals. The concentration of some metals in
these nodules is sufficient to cause serious consideration of nodule mining for
the recovery of heavy metals. While the exact mechanism of...
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Báo cáo " An analysis of soil characteristics for agricultural land use orientation in Thai Thuy District, Thai Binh " pdf
Ngày tải lên :
28/03/2014, 15:20
... time has resulted in the characteristics of 10 soil types, which are grouped in 4 main classes
(acid sulfate soil, saline soil, alluvial soil and sandy soil) . They have been used for agricultural ...
The article uses data gathered from the soil
profiles during the field survey. The results of
soil samples are then analysed in the Soil
Laboratory of Hanoi Agriculture University No
I. The ... sandy soil class
Sandy soil class including white sandy soil
and marine sandy soil type from the interaction
of sea, river, field current flow and wind. This
kind of soil is distributed along...
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báo cáo hóa học: " The role of interleukin-12 in the heavy metal-elicited immunomodulation: relevance of various evaluation methods" potx
Ngày tải lên :
20/06/2014, 00:20
... down-regulation of IL-12
levels in both cases of investigated metals.
Conclusion: It can be inferred that: (i) IL-12 profiles alone may represent a relevant indicator of
heavy metal- induced immune ... Therefore,
administration of IL-12 reversed the Th2-dominant heavy
metal- induced inhibition of host defense and boosted the
resistance of untreated mice marked by elevation of IFN-γ
profiles [35]. Similar ... profiles of IL-12p70 and IFN-γ in BALB/c mice exposed to heavy metalsFigure 3
Serum profiles of IL-12p70 and IFN-γ in BALB/c mice exposed to heavy metals. Data represent cytokines levels fol-
lowing...
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