饮用水部分必需元素含量健康标准的探讨

饮用水中有机物与有毒元素含量是单向限值，在小于限值的前提下越低越好；而必需元素含量应是双向阈值，低于阈值下限或高于阈值上限都是对人体健康不利的，优质饮用水要求少含不含有机物及有毒元素，同时又应含有必需元素的水。     

The Variation of Soil Organic Matter in a Forest-Cultivation Sequence Traced by Stable Carbon Isotopes

On the basis of different photosynthetic pathways.there is an obvious difference in δ^13C values between C3 and C4 plants,In terms of this characteristic,we analyzed the organic carbon content (forestlands:1.81%-16.00%;farmland:0.45%-2.22%) and δ^13C values(forestlands:-23.86‰--27.12‰;farmland:-19.66‰--23.26‰)of three profile-soil samples either in farmland or in forestland near the Maolan Karst virgin forest,where there were developed plant C3 plants previously and now are C4 plants.Results showed that the deforestation has accelerated the decomposition rate of soil organic matter and reduced the proportion of active components in soil organic matter and thus soil fertility.     

雪冰训痕量有机物的环境气候变化记录研究进展

目前对雪冰中痕量有机物的研究，主要涉及雪冰中的甲烷气体、可溶性有机酸、痕量人为有机污染物等。研究表明，这些痕量有机物主要为天然来地环境气候变化的响应敏感，随着雪冰样品前处理和分析测试技术的将会推动雪冰中痕量有机物的记录研究的发展。。     

环境有机地球化学初探

从分子有机地球化学与全球变化以及有毒有害难降解有机化合物的表生地球化学作用两个方面，探讨了环境地学与有机地球化学学科分支新领域──环境有机地球化学所研究的主要内容。文中列举了两个研究实例，一是应用分子标志物方法研究了北京、贵阳和广州三城市大气飘尘可溶有机质组成的成因；另一例是在广州市大气飘尘、水和底泥样品中鉴定出属于美国ＥＰＡ优先控制的有毒有害有机污染物，并探讨了这些毒害有机物在环境中气、液、固界面间可能存在的表生地球化学过程。     

Geochemical Characteristics of Oilfield Waters from the Turpan Depression,Xinjiang and Their Petroleum Geological Significance

This paper,based on the fundamental inorganic chemical and organic geochemical characteristics of oilfield waters from the Turpan Depression,presents the contents of organic matter,the distribution of low-carbon fatty acids and the contents of aromatic hydrocarbons as well as their principal ultraviolet absorption spectral and fluorescence spectral characteristics in oilfield waters from different oil/gas-bearing areas.The oil/gas reservoirs in this depression are classified in terms of their conserving conditions.In additon,the paper also discusses the chemical characteristics of oilfield waters from different types of oil/gas reservoirs with an emphasis on the characteristics of their localization in the γNa/γCa-γN a/γCl correction diagram.On this basis it is attempted to expound the fundamental geochemical characteristics of oilfield waters from the Turpan Depression and their geological significance.     

沉积物中水溶性天然有机物吸着系数的动态测定

探讨了直接测定沉积物中水溶性天然有机物吸着系数的可行性，提出了改变水土比和连续提取两种动态测定方法，从理论上分析了两种方法的操作误差，结果表明，这两种方法均能同时测定样品中水溶性有机物的含量和吸着系数；改变水土比法明显优于连续提取法，用该方法测定了伊春河沉积物样品中水溶性有机物的含量与吸着系数。     

Assessment on Redox Conditions and Organic Burial of Siliciferous Sediments at the Latest Permian Dalong Formation in Shangsi, Sichuan, South China

The redox sensitive elements, molybdenum (Mo) and uranium (U), in marine sediments from the latest Permian Dalong (大隆) Formation at the Shangsi (上寺) Section, Northeast Siehuan (四川), South China, were analyzed by inductively coupled plasma mass spectrometry (ICP-MS) to determine their response to a range of redox conditions, and to estimate the organic carbon burial rate. On the basis of the correlation between authigenic Mo abundance and organic carbon content in modern oceans, the organic carbon burial rates were calculated for the rocks at Dalong Formation, ranging from 0.48-125.83 mmol/(m2-d), which shows a larger range than the mineralization rate of organic carbon at the continental margins (1.6-4.23 mmol/(m2.d)). The Zr-normalized Mo and U abundances show large fluctuations in the entire section. The maxima of Zr-normalized Mo abundance and thus the maxima of the organic carbon burial rates were observed at the interval between the 155th and 156th beds (404-407 m above the base of Middle Permian). A decrease (the minimum) in U/Mo ratios is present in this interval. It is speculated that the oxygen-limited conditions and ultimately anoxia or euxinia may develop within this depth interval. In contrast, an enhanced enrichment of Zr-normallzed U abundance is found, in association with less enrichment in Zr-normnllzed Mo abundance in the interval from the I51st to 154th beds (395-404 m above the base of Middle Permian), inferring the dominance of a suboxic/anoxic depositional condition (denitrifying condition), or without free H2S. The presence of small quantities of dissolved oxygen may have caused the solubilization and loss of Mo from sediments. It is proposed that the multiple cycles of abrupt oxidation and reduction due to the upwelllng at this interval lead to the enhanced accumulation of authigenic U, but less enrichment of Mo. A decrease in the contents of U, Mo, and TOC is found above the 157th bed (407 m above the base of Middle Permian), in association with the enhanced U/Mo ratio, suggesting the overall oxic conditions at the end of the Dalong Formation.     

九龙江河口区有机物的转移和入海通量

１９９２－１９９３年４年个航次调查结果表明，九龙江河口区水体中总有机物的含量和转移与悬浮物含量密切相关。当ＳＰＭ含量低时，其转移过程接近于理想行为；当ＳＭＰ含量高时，同为非理想行为。