Nation-wide survey of isotope in environmental water in China

开发了一种无同位素效应的空气中水蒸气收集技术。在北京、福州、长春和兰州4个冬季、春季和夏季采集了水汽中的液氮和乙醇同位素(氧-18和氢)。水汽中氧-18的稳定同位素比值为-10-36%，平均值分别为-24.7(北京)、-20.8(兰州)、-13.5(福州)和-18.0(名古屋)。春季和夏季的Delta^&lt；18&gt；O值低于冬季。在北京、福州、内蒙古贵阳、长春、武昌、上海、兰州、乌鲁木齐、拉萨等地进行了包括雨水在内的环境水的采样。将样品送往名古屋测量。在中国，还测量了他们已经获得的约240个水样的三角洲^18；O和DeltaD值。此外，还调查了国际原子能机构的稳定同位素出版物和其他文献。在上述调查的基础上，获得了三角洲的区域分布。从分布上看，存在纬度效应和大陆效应。通过对资料的分析，发现：中国北部地处干旱半干旱区，温度效应明显。D过剩(d=deltaD-8Delta^&lt；18&gt；O)旱季(10-3月)大于湿季(4-9月)。

A technique for collecting water vapor in air without isotope effect had been developed. Liquid nitrogen and alcohol were isotopes (Oxygen-18 and Deuterium) in water vapor were sampled in winter, spring and summer seasons at Beijing, Fuzhou, Changchun, and Lanzhou.Stable isotope ratio of oxygen-18 (delta^<18>O) in water vapor was -10--36% : the average values were -24.7 (Beijing), -20.8 (Lanzhou), -13.5 (Fuzhou), and -18.0 (Nagoya). delta^<18>O values were lighter in spring and summer seasons than in winter season. delta^<18>O values in water vapor showed lighter values than those in rain water ; -7.3 (Beijing), -6.5 (Lanzhou), -5.6 (Fuzhou), and -6.7% (Nagoya).Sampling of environmental water including rain water has been carried out at Beijing, Fuzhou, Guiyang, Inner Mongolia, Changchun, Wuchang, Shanghai, Lanzhou, Wulumuqi and Lhasa. The samples were send to Nagoya and measured.In China, delta^<18>O and deltaD values about 240 water samples they had already obtained have been also measured.In addition, IAEA publication for stable isotopes and other literatures were surveyed.Based on the above investigation, regional distribution of delta^<18>O has been obtained. Latitude and continental effect were seen from the distribution. By analyzing the date, the following features were revealed : In the northern part of China, where is situated in dry and semi-dry district, temperature effect was seen. The amount effect was seen in the southern part of China, where is situated in humid and semi-humid district.d excess (d=deltaD- 8delta^<18>O) showed large value in dry season (Oct.-March) than in humid season (April- Sept.).