Preliminary study of the correlation between trace elementsin human hair, liver and kidney by protoninduced X-ray emission analysis

This paper deals with the determination of trace elements in normal human hair, liver and kidney by Proton Induced X-ray Emission (PIXE) analysis. Sampling, specimen preparation and experimental procedures are described in detail. The accuracy of our system has been checked up with the determination of standard reference materials. The preliminary results on correlations between trace elements in human tissues are discussed. Application of the method described in the paper gives evidence in favour of the PIXE as a good tool on environmental life elements and health studies.     

南大别山超高压岩区变质作用的P-T-t研究-兼论花岗片麻岩与超高压变质岩的关系

南大别山超高压变质杂岩与花岗片麻岩具有不同的变质矿物组合和结构特征,显示它们之间变质作用条件和过程可能存在着差异.超高压榴辉岩峰期变质的温度为754～866℃,压力大于2.7Gpa,退变到榴闪岩和角闪岩的温、压条件分别为0.55～0.69 Gpa和470～570℃.花岗片麻岩中所见到的最高变质作用为角闪岩相,变质的温、压条件分别为450～515℃和0.60～0.75Gpa.花岗片麻岩的变质条件与超高压榴辉岩的退变质条件类似,说明它们之间至少在抬升到约20～25km深的地壳层位后具有共同的抬升和冷却历史.花岗(片麻)岩在超高压环境下处于一种亚稳定状态,尚未来得及发生超高压变质作用就已折返到地壳层位.     

箱技术测量土壤痕量气体释放通量中的误差因素—以N_2O为例

箱技术是测量土壤痕量气体释放通量的最常用方法 ,本文在理论和实际应用上探讨了箱技术尤其是密闭箱技术使用过程中可能引起痕量气体释放通量偏差的若干问题及可能的解决方法     

Evaluation on abundance or deficiency of avai- lable trace elements in soil of middle area in China and the effect of applying trace element fertilizer

Ｅｖａｌｕａｔｉｏｎｏｎａｂｕｎｄａｎｃｅｏｒｄｅｆｉｃｉｅｎｃｙｏｆａｖａｉ－ｌａｂｌｅｔｒａｃｅｅｌｅｍｅｎｔｓｉｎｓｏｉｌｏｆｍｉｄｄｌｅａｒｅａｉｎＣｈｉｎａａｎｄｔｈｅｅｆｆｅｃｔｏｆａｐｐｌｙｉｎｇｔｒａｃｅｅｌｅｍｅｎｔｆｅｒｔｉｌｉｚ...     

中德国际合作磴口县有机农业项目区土壤环境质量现状评价与对策建议

本文按照磴口县生态环境特点，分析测定了该县有机农业发展区域土壤的养分含量状况以及污染元素、微量元素含量和农药残留量，认为土壤有机质在0．76—1．31％之间，含量较低，需要增施有机肥提高土壤有机质含量。土壤中碱解氮、有效磷、有效钾的含量均高于一级指标。肥力水平优良；土壤pH平均8．83，为微碱性。土壤中微量元素不缺，无重金属和农药污染现象。适合于发展有机农业，生产高品质和安全的有机食品。     

铬天青S分光光度法测定痕量铝的研究

研究了铝-铬天青S(CAS)-溴化十六烷基吡啶(CPB)分光光度法测定水样中痕量铝的最佳实验条件。结果表明:铝-铬天青S(CAS)-溴化十六烷基吡啶(CPB)三元显色体系的最大吸收波长为640nm;最佳显色时间30m in;显色剂铬天青S(CAS)最佳用量2.00mL(0.5g/L);最佳显色pH5.5。在实验确定的最佳条件下,测定结果有较好的稳定性,较高的准确度。     

广东连县水足塘下石炭统的遗迹化石及其环境意义

广东连县水足塘下石炭统六个层位发育丰富的遗迹化石,遗迹大都保留于灰岩、泥灰岩中,共计有九个遗迹属及类型,它们是Zoophycos管状潜穴,Chondrites,Thalassinoides,Teichichnus?枝状潜穴,不规则状潜穴。Planolites和Ancorlchnus。其中刘家塘组下部发现管状潜穴;中上部发现Zoophycos、Thalassinoides、不规则状潜穴Chondrites、Teichichnus?及枝状潜穴,它们形成一遗迹组合;石蹬子组发现Chondrites及Ancourichnus;梓门桥组发现Zoophycos及Planolites.此组合形成于开阔台地相,成员形成于不同时的底质,分属Zoophycos和Glossifungites两个遗迹相。     

六安—蔡河地学剖面构造岩性单元的划分

叙述了大别造山带主要岩石类型及热源体周围微量元素的分布、分配特征 ,研究了它们的影响因素和地质意义 ,并根据六安—蔡河地学剖面微量元素和收集的地球物理、同位素年龄等资料 ,对该剖面构造岩性单元进行了划分。     

煤中痕量元素分布的多变量分析及实验研究

本文用多变量分析法研究了煤中痕量元素的分布，并用实验研究了有机溶剂提取前后青山烟煤中痕量元素的变化。多变量分析结果表明：Ａｓ，Ｃｒ，Ｃｏ，Ｎｉ，Ｃｕ，Ｃｄ，Ｖ，Ｐｂ等元素与Ｂｅ，Ｇｅ在煤中具有不同的分布特征，对青山烟煤的实验研究结果则表明：Ｃｒ，Ｃｏ，Ｎｉ，Ｃｕ，Ｃｄ，Ｐｂ等元素趋向于与煤中的矿物质相结合，而Ｂｅ，Ｇｅ两元素有较强的有机亲和性。实验研究结果与多变量分析结果相符。     

Urban Geochemistry: Investigations in the Berlin Metropolitan Area

The distribution of 41 trace and 11 major elements in 4000 samples of topsoils (0–20cm) from the Berlin Megacity is interpreted. The detailed comparative analysis of the element distributions and the results of factor analysis showed that the distributions of the elements Al, K, Na, Rb, Zr, Nb and Ti are mainly natural origin, i.e. related to the composition of the parent material. Industrial and commercial areas often display considerably elevated values for Mo, Ni, As, Ag, Cr, Sb, Fe, Mn, Mg, P, TOC and especially Pb, Hg and electrical conductivity relative to the geogenic background of the area surrounding Berlin. Industrial areas tend to be characterised by contamination of the subsoil with Cu, Cd, Zn, Hg, Pb and Sn. In the area around Berlin, extensive, strong anamalies of Cd, Zn, Pb, Cu and Hg occur near iron and steel industries and construction materials industries, as well as in the vicinity of sewage farms.