青海省海晏县哈勒景河谷厂区排放Cr~（＋6）对地下水污染的评价     

金家琼  于香辉  权国苍  刘亚男 《地质灾害与环境保护》2014,25(4):78-82

对该区的污染源和污染现况进行调查。利用地下水质量分类指标进行污染分区评价,并分别计算重度、轻度和未污染区面积。结果发现污染区内地下水环境污染严重,建议尽快实施工程治理。  相似文献   

太阳系~(53)Mn-~(53)Cr同位素体系     

杨晶  林杨挺  王桂琴 《矿物岩石地球化学通报》2014,33(6)

短周期放射性核素的初始丰度和分布情况,已成为陨石学和天体化学的重要研究领域之一。已有研究证实地外天体中53 Cr的放射性母体为53 Mn。53 Mn的半衰期为3.7±0.4Ma,可对太阳系形成之后的20Ma内发生的事件进行精确定年。本文系统总结了已报道的碳质球粒陨石、普通球粒陨石、顽辉石球粒陨石和分异陨石中的53 Mn-53 Cr同位素体系数据,依据55 Mn/52 Cr值和53 Cr异常探讨了太阳系形成时53 Mn和53 Cr的初始分布情况、太阳系初始的53 Mn/55 Mn值,讨论了陨石中普遍存在的54 Cr/52 Cr值异常和碳质球粒陨石全岩的54 Cr和53 Cr异常值之间的正相关关系对53 Mn-53 Cr体系定年影响。  相似文献   

HNO3-HClO4-原子吸收分光光度法测定海洋生物体中Cu,Pb,Zn,Cd,Cr     

董炜峰  苏荣 《海洋通报》2007,26(2):96-99

参考《海洋监测规范第6部分:生物体分析》(GB17378.6-1998)的规范方法,采用单一HNO3-HClO4常压方法消化贻贝成分分析分析标准物质(GBW08571)。取样量为0.500g时,在加热温度为160℃～210℃,加入10mL HNO3、2mLHClO4,加盖加热7h左右,最后的样品消化液赶酸赶净的条件下,样品消化液直接以原子吸收分光光度计测定,其中Cu,Pb,Zn,Cd,Cr的测定值都在标准值范围之内。并着重对比温度对消化效果的影响以及Cu,Cd以火焰法与无火焰法测定的差别。  相似文献   

Genetic implications of Zn‐ and Mn‐rich Cr‐spinels in serpentinites of the Tidding Suture Zone,eastern Himalaya,NE India     

Athokpam K. Singh  Rajkumar B. Singh 《Geological Journal》2013,48(1):22-38

Metamorphosed serpentinites of the Tidding Suture Zone (TSZ), eastern Himalaya, contain variably altered Cr‐spinels that are concentrically zoned from high‐Cr, low‐Fe³⁺ spinel at the core to Cr‐magnetite at the rim. Two types of Cr‐spinel have been recognized, based on back‐scattered electron imaging in conjunction with microprobe analytical profiles. Cr‐spinel type‐I is present in the least metamorphosed serpentinite (Cr# = 0.78–0.85, Mg# = 0.38–0.45) and Cr‐spinel type‐II is present in the most highly metamorphosed serpentinite (Cr# = 0.86–0.94, Mg# = 0.10–0.34). Primary igneous compositions are preserved in the type‐I chromites whereas these compositions have been partly or completely obscured by metamorphism and alteration in type‐II grains. The enrichment of Mn and Zn increases from the type‐I (MnO = 1.86–2.42 wt.%, ZnO = 0.77–1.67 wt.%) to type‐II (MnO = 2.72–4.04 wt.%, ZnO = 1.33–3.22 wt.%) and the strong similarity in their distribution patterns implies that these elements were introduced during low‐grade metamorphism and serpentinization. The abundance of Mg‐rich chlorite and serpentine minerals suggest that olivine was the predominant silicate phase before serpentinization. Zn and Mn enrichment in the core zone of the Cr‐spinel is due to the substitution of Mg²⁺ and in part of Fe²⁺, by Zn and Mn. These elements were probably supplied from olivine upon serpentinization during and after obduction of the ophiolitic mélange along the Tidding Suture Zone in the eastern Himalaya, NE India. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献