Nation-wide survey of isotope in environmental water in China

研制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、长春和兰州的冬季、春季和夏季采集了水蒸气中的液氮和醇同位素（氧-18和氘）。水汽中氧-18 （δ ^<18>O）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）。δ ^<18>值春、夏季较冬季轻。水蒸气中的δ ^<18>值比雨水中的δ ^<18>值轻；-7.3(北京),-6.5(兰州),-5.6(福州)和-6.7%(名古屋)。在北京、福州、贵阳、内蒙古、长春、武昌、上海、兰州、乌鲁木齐、拉萨等地开展了包括雨水在内的环境水采样。样品被送到名古屋进行测量。在中国，他们还测量了他们已经获得的240个水样的delta^<18>O和delta值。此外，对国际原子能机构关于稳定同位素的出版物和其他文献进行了调查。在此基础上，得到了三角洲^<18>O的区域分布。从分布上可以看出纬度和大陆效应。通过对数据的分析，揭示了以下特征：中国北部处于干旱和半干旱地区，存在温度效应；数量效应主要出现在中国南部湿润和半湿润地区。d过剩值（d=deltaD ~ 8delta^<18>）在旱季（10 ~ 3月）大于湿润季（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.).