Rapid transport of organochlorine pesticides (OCPs) in multimedia environment from karst area

2021 ◽  
Vol 775 ◽  
pp. 145698
Author(s):  
Huanfang Huang ◽  
Huafeng Liu ◽  
Shuai Xiong ◽  
Faming Zeng ◽  
Jianwei Bu ◽  
...  
Author(s):  
Anna Udelkina

This article is devoted to the study of the multimedia environment of the polemic discourse in German media with its diverse formats of impact on the audience and the actively developing internal dynamics of texts. If at the end of the XXth century the specifics of German media were the use of the Internet site as one of the possibilities to present copies of newspapers and magazines in electronic form, today we can speak of modified, hybrid Internet versions of printed publications that do not just create websites on the Internet that duplicate their main activity, but also combines the features of the traditional press and features of the functioning of texts on the Internet. The transition from linear, monomedia broadcasting platforms to discrete, multimedia ones has a significant impact on the process of creating, designing and placing modern polemics. Texts of articles and user comments are considered in the article as tmaterialization of the polemic discourse in the media. Polemic texts are formed on the basis of intertextual structures and have a hypertext nature. The use of multimedia tools (a variety of fonts, graphics, animation, photo, video and sound) in the text of the article allows the author not only to expand the amount of information provided, but also to qualitatively supplement its content through inline inclusions tn the text, to express the meaning of information by referring to verbal and non-verbal means; to provide a visual and figurative presentation of information (graphs, charts, tables), to attract attention and influence the audience, as well as to provide readers with the opportunity to participate in information exchange.


2013 ◽  
Vol 19 (4) ◽  
pp. 670-676 ◽  
Author(s):  
Fei WANG ◽  
Peng FU ◽  
Xiuping MA ◽  
Weixin JING ◽  
Lan WANG

1999 ◽  
Vol 30 (4-5) ◽  
pp. 333-360 ◽  
Author(s):  
Larry McKay ◽  
Johnny Fredericia ◽  
Melissa Lenczewski ◽  
Jørn Morthorst ◽  
Knud Erik S. Klint

A field experiment shows that rapid downward migration of solutes and microorganisms can occur in a fractured till. A solute tracer, chloride, and a bacteriophage tracer, PRD-1, were added to groundwater and allowed to infiltrate downwards over a 4 × 4 m area. Chloride was detected in horizontal filters at 2.0 m depth within 3-40 days of the start of the tracer test, and PRD-1 was detected in the same filters within 0.27 - 27 days. At 2.8 m depth chloride appeared in all the filters, but PRD-1 appeared in only about one-third of the filters. At 4.0 m depth chloride appeared in about one-third of the filters and trace amounts of PRD-1 were detected in only 2 of the 36 filters. Transport rates and peak tracer concentrations decreased with depth, but at each depth there was a high degree of variability. The transport data is generally consistent with expectations based on hydraulic conductivity measurements and on the observed density of fractures and biopores, both of which decrease with depth. Transport of chloride was apparently retarded by diffusion into the fine-grained matrix between fractures, but the rapid transport of PRD-1, with little dispersion, indicates that it was transported mainly through the fractures.


1986 ◽  
Vol 21 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Robert C. McCrea ◽  
Greg M. Wickware

Abstract Peatland waters of the Moose River basin, as well as surficial sediments and vascular plants of the estuary were sampled in 1982. Elevated levels of PCBs were found at all five peatland sites; concentrations ranged from 28 to 65 ng/L. Of the seventeen organochlorine pesticides investigated, the hexachlorocyclohexane isomers (a-and y-BHC) were the most prominent with total BHC concentrations ranging from 1.5 to 13.7 ng/L. The presence of these contaminants in ombrotrophic bogs indicated that there was atmospheric deposition of organochlorine contaminants in the basin. Analyses of surficial sediments, collected from tidal flats and coastal marshes, showed that PCBs and organochlorine pesticides were not present. Samples of Triglochin maritima L. seed heads and Typha latifolia L. roots were also free of PCBs.


1997 ◽  
Vol 35 (7) ◽  
pp. 139-145 ◽  
Author(s):  
Jiann-Yuan Ding ◽  
Shian-Chee Wu

The objective of this study is to quantify the effects of humic acid solution infiltration on the transport of organochlorine pesticides (OCPs) in soil columns using a three-phase transport model. From experimental results, it is found that the dissolved organic carbon enhances the transport of OCPs in the soil columns. In the OCPs-only column, the concentration profiles of OCPs can be simulated well using a two-phase transport model with numerical method or analytical solution. In the OCPs-DOC column, the migrations of aldrin, DDT and its daughter compounds are faster than those in the OCPs-only column. The simulation with the three-phase model is more accurate than that with the two-phase model. In addition, significant decrease of the fluid pore velocities of the OCPs-DOC column was found. When DOC leachate is applied for remediation of soil or groundwater pollution, the decrease of mean pore velocities will be a crucial affecting factor.


2002 ◽  
Vol 29 (4) ◽  
pp. 163-169
Author(s):  
A L Juhasz ◽  
E Smith ◽  
J Smith ◽  
R Naidu

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