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1.
Spatial distribution of metals in urban topsoils of Xuzhou (China): controlling factors and environmental implications 总被引:2,自引:0,他引:2
The contamination of soils by metals from various sources is a subject of increasing concern in recent times. Twenty-eight
elements (Fe, Ti, Cr, Al, Ga, Pb, Sc, Ba, Li, Cd, Be, Co, Cu, Mn, Ni, V, Zn, Mo, Pt, Pd, Au, As, Sb, Se, Hg, Bi, Ag and Sn)
have been analyzed from urban topsoil from the city of Xuzhou. The concentrations of these analyzed elements have been correlated
to some soil parameters such as organic matter, pH, cation exchange capacity, carbonate content, and granulometric fractions
(clay, silt and sand). Results of the statistical analysis show a large variety and complexity in these relationships. The
spatial distributions of these metal concentrations were also constructed using geographical information system. The spatial
distribution patterns of the elements analyzed show that traffic and industrial activities are the principal anthropogenic
pollutant sources. 相似文献
2.
华北地台钼(铜)矿床成矿年代学研究——辉钼矿铼-锇年龄及其地质意义 总被引:31,自引:7,他引:31
华北地台北缘的工产辽和南缘的东秦岭两个钼矿带闻名遐迩。本文用同位素稀释-等离子体质谱法,直接测定了燕辽钼矿带中兰家沟钼矿床的Re-Os等时线年龄为(186.5±0.7)×10^6a,杨家杖和肖家营子钼矿床的Re-Os模式年龄为(187±2)×10^6d-(d191±6)×d10^6a和(177±5)×10^6a,小寺沟和寿王坟铜矿床的Re-Os模式为DD(134±3)×10^4a和(148±4)× 相似文献