| 摘要: |
| 用最大泡压法测定大洋海水及其被纯水稀释的海水温度在15－35℃，盐度5－35的表面张力。所得数据经计算机统计处理得出海水表面张力（σ，mN/m）同温度（t，℃）和盐度（s）之间的经验公式：σst=75.59+0.021352s-0.13476t-0.00029529st
在分别恒定盐度、温度时，海水表面张力与温度、盐度有很好的线性关系；其温度系数和盐度系数均非常数，温度系数随盐度增加绝对值增大，而其盐度系数随温度升高而变小。 |
| 关键词: 海水表面张力 温度 盐度 经验公式 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金和国家海洋局科技发展基金联合资助，49070272号 |
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| STUDY ON THE SURFACE TENSION OF SEAWATER—EMPIRICAL RELATIONSHIP BETWEEN SEAWATER SURFACE TENSION AND TEMPERATURE AND PRACTICAL SALINITY |
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Chen Guohua, She Jingzeng, Guo Ling, Zhang Li jun
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Department of Marine Chemistry, Ocean University of Qingdao, Qingdao 266003
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| Abstract: |
| The surface tension of oceanic seawater in the temperature range of 15 - 35°C and salinity range of 5 - 35 was determined by the max-bubble-pressure method (M-BPM). The seawater sample with salinity of 34.5 was obtained from the North Pacific near Japan. The samples with salinity below 34.5 were prepared by dilution with pure water. Then a new experimental equation was obtained on the basis of these measurements which for the first time directly detected the relationship between surface tension (σ) of seawater and temperature (t) and the practical salinity(s):
σst=75.59+0.021352s-0.13476t-0.00029529st (mN/m)
The average absolute deviation of the surface tension computed from this expression from the measured value was 0.07 mN/m. Results obtained show that the temperature or salinity coefficient of seawater surface tension is not a constant. The temperature coefficient has the linear relation with the salinity, and the salinity coefficient has also the linear relation with the temperature. |
| Key words: Surface tension of seawater, Temperature, Salinity, Empirical equation |
