5-p-Tolyl-1,2,3,3a-tetra-hydro-benzo[e]pyrrolo-[2,1-b][1,3]oxazepin-10(5H)-one.

The structure of the title compound, C(19)H(19)NO(2), contains a seven-membered ring, which is fused to one five- and one six-membered ring, and carries a tolyl substituent. The two benzene rings are oriented relative to each other at a dihedral angle of 86.90 (7)°. In the crystal, mol-ecules are linked by weak inter-molecular C-H⋯O hydrogen bonds.

Distribution and ecological effect of mercury in Laogang landfill, Shanghai, China.

Laogang landfill near Shanghai is the largest landfill in China, and receives about 10000 t of daily garbage per day. Samples of topsoil and plants were analyzed to evaluate mercury pollution from the landfill. For topsoil samples, there were significant correlations among total mercury (HgT), combinative mercury (HgC) and gaseous mercury (HgG), and content of total organic carbon (TOC), but, no significantly relationship was found between Hg content and filling time. Hg content changes in vertical profiles with time showed that the average HgT of profiles 1992, 1996, and 2000 was similar, but their average HgG was quite different. HgT was significantly correlated with HgC in profile 1992 and 2000, and HgT was significantly correlated with HgG in profile 1996. HgG/HgT ratio in profile samples decreased in the order of (HgG/HgT)1992 > (HgG/Hg)1996 >> (Hg/HgT)2000. A simple outline of Hg release in landfill could be drawn: with increasing of filling time, degradation undergoes different biodegradation, accordingly, gaseous mercury goes through small, more, and small proportion to total mercury. Distribution of Hg in plants was inhomogeneous, following the order of leaf > root > stem. The highest value of leaf may be associated with higher atmospheric Hg from landfill. Ligneous plants (e.g. Phyllostachys glanca, Prunus salicina and Ligustrum lucidum) are capable of enriching more Hg than herbaceous plants.

[Effect factors for mercury accumulation to natural surface coatings and analysis its forms of occurrence].

In order to probe to the factors for mercury accumulation to natural surface coating, we study the concentration of mercury in Huangpu River surface coatings developed for different depth, different grown days and different seasons and analysis mercury forms of occurrence. The result show the organic matter in biofilm is much high (7.5%-14.5%). Growth time, depth and seasons are all important factors for mercury accumulation to surface coating. Illumination and temperature was stronger and the growth day was longer, The concentration of mercury in biofilm was higher. The mercury forms of occurrence in surface coating were mainly residual matter bound mercury (41.98%) and organic acids bound mercury (27.89%). The percentage of carbonate bound mercury (10.17%) and ion exchangeable mercury (5.33%) was little.

[Distribution and species of mercury in water and sediments from Huangpu River].

Levels of total mercury, soluble mercury and particle mercury in water of Huangpu River change greatly, their average values are (0.4 +/- 0.44) ng/mL, (0.27 +/- 0.42)ng/mL, (0.13 +/- 0.10) ng/mL respectively. Mercury in water is mainly in the form of soluble mercury. Average mercury content in sediment of Huangpu River is relative high and up to (204.03 +/- 97.41) ng/g, with a range of 70.52 ng/g - 387.30 ng/g. Mercury content is high in the middle reach of Huangpu River, especially in section of Xidu-Nanpu Bridge, and low in upstream and downstream. Distribution of mercury is hightly related with distribution of industry plants and farming. Locations with high mercury content in sediment are in the downstream of locations with high mercury content in water. Mercury (in sediments) is mainly in the form of residue, exchangeable ions, and humics-bound, seldom is in the form of carbonate-bound. Contrary to residue-bound mercury, exchangeable mercury is low in the middle reach, and high in upstream and downstream. There mainly are residue-bound mercury and little humics-bound mercury, exchangeable mercury, and carbonate-bound mercury in sediment in profile, and the residue-bound mercury increases irregularly with depth. Nearing the Mouth of Yangtze River, mercury in sediment becomes more active.

[Mercury pollution and its ecosystem effects in Wanshan mercury miner area, Guizhou].

Samples of water, soil, plants, crops and animals collected from Wanshan mercury miner area, Guzhou Province, were analyzed with an AMA-254 liquid/solid mercury analyzer. It was shown that mercury pollution is mainly in soil and air; except water from a pool, no anomaly mercury is found in waters. Mercury content in soil is 24.31-347.52 mg.kg-1, two or three magnitude higher than the average value of Chinese soils; mercury content in plants is 0.47-331.4 mg.kg-1, and moss can enrich much mercury. Due to the long time of exploration and smelting, abundant mercury are accumulated in the local ecosystem, and healthy of local people are threatened seriously.