Geological Institute of Gold Armed Police Army

Langfang, China

Geological Institute of Gold Armed Police Army

Langfang, China

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Wang Y.-P.,National Research Center for Geoanalysis | Wang L.,National Research Center for Geoanalysis | Wang L.,Geological Institute of Gold Armed Police Army | Xu C.-X.,National Research Center for Geoanalysis | And 2 more authors.
Geological Bulletin of China | Year: 2012

Heavy metal elements in river sediments are all potentially harmful to aquatic organisms and human beings, for they can be released to the water with the change of environmental conditions. Therefore, the study of the factors that account for the release of heavy metals in sediments is very important. In this paper, the release of heavy metal elements Cd and Pb at different pH from the lower reaches of the Yangtze River sediments and the change of speciation of Cd and Pb before and after the release were investigated. The results showed that the release of Cd and Pb mainly occurred under acidic conditions, and the related rates decreased quickly with the rise of pH. When pH≤7.0, the release rates were all very low. At the same time, the release of Cd was significantly greater than that of Pb. Speciation analysis of Cd and Pb of four typical sediments showed that Cd in Nanjing site sample mainly existed in residue, and Cd in other three sites samples existed mostly in acid extractable and reducible states, whereas Pb was mainly in residue in these four sediment samples. With the changes of pH, all species of Cd were released in varying degrees, among which acid extractable and reducible states were released most remarkably. In contrast, Pb in various states didn't show evidence of obvious release.


Wang L.,Geological Institute of Gold Armed Police Army | Wang L.,China University of Geosciences | Yang L.-Q.,Geological Institute of Gold Armed Police Army | Wang Y.-P.,National Research Center for Geoanalysis | And 3 more authors.
Geological Bulletin of China | Year: 2012

Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) has been widely used in microanalysis because of its high sensitivity, low detection limits, the determination of major, minor and trace elements in solids, as well as isotope-ratio measurements. This review aims to summarize recent developments in LA-ICP-MS based on the instrumental and fundamental aspects. Emphasis is placed on the developments of laser ablation for sample introduction to ICP-MS (nanosecond and femtosecond laser), calibration strategies, fraction effects and its applications of minor element, isotope and melt and fluid inclusions in geosciences. At the same time, the limitations and future developments of LA-ICP-MS microanalysis techniques are also discussed.


Wang L.,Geological Institute of Gold Armed Police Army | Wang L.,National Research Center for Geoanalysis | Wang Y.-P.,National Research Center for Geoanalysis | Xu C.-X.,National Research Center for Geoanalysis | And 2 more authors.
Geological Bulletin of China | Year: 2012

In this paper, adsorption characteristics of Cd and Pb in three kinds of paddy soils in southern China were studied. The result showed that the sorption characteristics of Cd and Pb in paddy soils were similar, and their adsorption isotherms were all well described by Langmuir equation. Two soil samples with relatively high pH and comparatively low organic matter, CEC, clay content and kaolinite content had greater adsorption capability for Cd and Pb, as estimated by the maximum adsorption parameter (B) of the Langmuir equation. The presence of both metals reduced the tendency for either metal to be absorbed in soils; at the same time, Cd adsorption was affected to a greater extent than that of Pb, but all soils exhibited greater sorption capacity for Pb than for Cd. In three kinds of soils, the Langmuir binding strength parameter (K) was always greater for Pb than for Cd. Meanwhile, K value of binary solution was higher than single solution. This may indicate that the competition for adsorption sites promotes the retention of both metals at some specific adsorption sites, which can cause firm adsorption of metals in specific sites of soils.

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