TABLE 2 - uploaded by Zhang Guicheng
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The distribution patterns of nonylphenol (NP) were surveyed in 26 surface sediments and one sediment core collected from Yangtze Estuary and its adjacent area from May to June of 2010. In the surface sediments, NP concentrations first increased and then decreased from inshore to offshore, ranging from 137.5 ng/g dry weight (d.w.) to 559.0 ng/g d.w....
Context in source publication
Context 1
... reports have been published on the NP concen- trations in several bays, estuaries, and coastal areas. The concentrations of NP observed in this study were greater- than those in Bohai Sea [13], similar to those in Pearl River Estuary [15], around the South China Sea [15], and North Yellow Sea [16], but lower than those in Pearl River Delta [33] and Jamaica Bay [34] (Table 2). Compared with that in the coastal areas of other countries, NP pollution in YZE and its adjacent areas was at the medium level. ...
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Citations
A large area of carbonate-saline soil is distributed in western Jilin Province. To effectively prevent and treat the frost heaving damage of engineering structures, this paper studied the frost heaving characteristics of carbonate-saline soil in western Jilin Province, where such phenomena as frost heaving of roadbeds as well as cracking and damaging of headrace channels have become increasingly severe. With carbonate-saline soil obtained from different sampling points and depths in the Daan and Sanzhigou areas of Jilin Province as the research object, the influences of temperature, moisture content, compaction degree and salt content on the frost heaving characteristics of soil samples were studied and analysed through laboratory frost heaving tests. The results showed that the frost heaving ratio of the soil samples, which had little differences in similar properties, increased with an increase in moisture content, salt content and compaction degree generally, and soil samples with a higher salt content had the best frost heaving compaction degree. Influences of temperature on the frost heaving ratio were related to the salt content, where the freezing point of a soil sample with a high salt content was lower and the unfrozen-moisture content was higher. Moreover, there was no obvious temperature interval with constantly changing frost heaving deformation. The frost action lasted longer, ice crystals and salt crystals developed sufficiently and the ultimate frost heaving ratio reached a higher value. Soil samples from the Daan area have the characteristics of high clay content, large specific area, strong water holding capacity, low freezing point and long duration of frost action, and the ultimate frost heaving ratio of these soil samples was higher than those of the Sanzhigou area. Considering the synthetic effects from internal and external causes, a comprehensive study is carried out for the frost heaving properties of carbonate-saline soil in different areas combined with soil properties and external factors.
