[Magnetic response of street tree leaves to particulate pollution in Shanghai].

To reveal the magnetic response to atmospheric particulate pollution in tree leaves along urban streets, twenty-four evergreen tree leaves were collected from green belt along Jinshajiang road, Shanghai, which were subjected to magnetic and heavy metals (Zn, Cu, Pb) analyses. The result revealed that in all leaf samples chi, SIRM varied in ranges of (4-59) x 10(-8) m3 x kg(-1) and (496-6 114) x 10(-6) Am2 x kg(-1), respectively, S(-300mT) varied from 89% to 98% and chi(ARM)/chi < 4, chi(ARM)/SIRM < 30 x 10(-5) mA(-1) was found. The magnetic parameters showed that ferromagnetic/ferrimagnetic particles were the main magnetic carriers in dust-loaded tree leaves, and magnetic grains were predominantly pseudo-single domain (PSD) and multidomain (MD) in size.

[Spatial distribution and contamination evaluation of heavy metals in the intertidal surface sediments of Eastern Chongming].

Using the ArcGIS geostatistical analysis module, this work investigated the spatial distribution pattern of heavy metals (Cu, Pb, Zn, Cr, Cd) and their deposition fluxes in the intertidal surface sediments of Eastern Chongming based on the analysis of grain size, heavy metal concentrations and organic carbon content. The spatial interpolation (Kriging) was performed to estimate the deposition fluxes, and the contamination status of heavy metals was evaluated using geoaccumulation index and potential ecological risk index. The results showed that the average contents of Cu, Pb, Zn, Cr and Cd were 42, 27, 69, 71 and 0.