权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The study of minor constituents in Antarctic ice samples as an environmental indicator.

研究南极冰样本中的微量成分作为环境指标。

基本信息

批准号：
61470001
负责人：
KANAMORI Satoru
金额：
$ 3.14万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61470001/
关键词：
Antarctic ice and snow minor elements heavy metal elements organoc heavy metal distribution state of existence environmental variation 環境変動生物活動南極氷床雪氷試料試料汚染微量成分化学分析環境変化

项目摘要

1)Firn block samples were taken at S-25 site located at ca.40Km inland from shore line and analysed for CL,SO_4,Na,K and NH_4 by IC and Fe,Al,Cu and Zn by HPLC mcthods. These samples cover from snow surface(Feb.1,1986)to 50cm depth (Feb.,1985)or nearly 1 year.Na and Cl show characterstic distribution,high(800ppb and 450ppb, respectively) in 0-37cm layer and low (200ppb and 100ppb, respectively) in 37-50cm layer.The Na/Cl ratio is close to 0.5 and indicats seasalt origine.Their characteristic distribution patern suggests existence of some definit process responsible to the drastic chanfe in their concentration levels. NO_3 shows high peak in the spring.2)Inorganic,organic and insoluble fractions of haeavy metal elements were measured separately. The total concentrations of Fe, Al,Cu and Zn were ca. 300ppt,500ppt,500ppt and 100ppt,respectively with active variation mostly in accordance with that of organic fraction but in contrast with that of major elements.The organic haeavy metals are expected to have some different sources and pass-way other than those of major elements.3)These organic heavy metal compounds have been found in Antarctic aerosol as well as in that on land and maritime air This indicats that the organic heavy metal compounds are prevailing in the global atmospheric aerosol and the study of their distribution in Antarctic ice reveals the historical variation of global biological activity or that of environmental conditions as these organic heavy metal compounds can be produced only through biological activity.

1)在距海岸线约40公里处的S-25测点采集了雪块样品，用离子色谱法测定了Cl、SO_4、Na、K和NH_4，用高效液相色谱法测定了Fe、Al、Cu和Zn。这些样品覆盖了从雪面（1986年2月1日）到50 cm深（1987年2月1日）的雪样。Na、Cl呈特征性分布，高浓度的Na、Cl 0- 37 cm土层中的含量分别为800 ppb和450 ppb，（200 ppb和100 ppb，37- 50 cm土层中Na/Cl比值接近0.5，为海盐来源，其分布特征表明，存在着某些导致其浓度急剧变化的过程。NO_3在春季出现高峰。2）重金属元素的无机态、有机态和不溶态分别测定。Fe、Al、Cu和Zn的总含量约为0.001 mg/L。300ppt、500ppt、500ppt和100ppt，有机重金属的变化与常量元素的变化基本一致，但与常量元素的变化相反，有机重金属可能有不同于常量元素的来源和途径。这些有机重金属化合物不仅在南极大气气溶胶中发现，而且在陆地和海洋大气气溶胶中也发现。通过对这些有机重金属化合物在全球大气气溶胶中的分布及其在南极冰中分布的研究，揭示了全球生物活动或环境条件的历史变化，因为这些有机重金属化合物只能通过生物活动产生。