| 摘要: |
| 用磁力浮沉子法溶液密度测量装置,在15—25°C之间的三个温度下测定了黄河口渤海湾36个站位海水样品（于1989年7月和1990年7月采集）的密度,发现所有实验测定值与根据其盐度和温度由1980年国际海水状态方程的计算值比较,均有明显的正偏差,此正偏差随海水盐度降低而增大。在黄河口渤海湾海水样品全部盐度范围内,已发现其海水密度正偏差与海水[Ca2+]/s,[Mg2+]/s,[SO42-]/s之间呈指数曲线相关,而与碱度之间呈S形曲线相关,但在盐度25.72 - 31.57范围内都可近似看作直线相关。黄河口渤海湾海水的高碱度、高[Ca2+]/s为其特征,这也是其密度正偏差的主要影响因素。本文还给出了计算黄河口及渤海湾海水密度的公式。 |
| 关键词: 黄河口 渤海湾 海水密度 离子比 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目,488023号 |
附件 |
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| DENSITY OF SEAWATER IN THE HUANGHE RIVER ESTUARY AND BOHA1 BAY |
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Chen Guohua, Ji Rong, Xie Shinan, Zhang Lijun
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Department of Chemistry, Ocean University of Qingdao, 266003
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| Abstract: |
| The density and salinity of 36 seawater samples collected from the Huanghe River Estuary and Bohai Bay were measured with a high precision magnetic float densimeter at 24.950°C, 19.890°C and 15.230°C, respectively. The chemical parameter of the calcium, magnesium, alkalinity, pH, SO42-, chlorinity etc. were also determined. All the measured densities were higher than that calculated by the International Equation of State of Seawater, 1980. The average difference between the measured and computed densities increase with the decrease of salinity. The average differences for the North Huanghai, the outside and the inside of the Bohai Bay were 2.1×10-3 kg/m3, 9.4×10-3 kg/m3 and 13.8×10-3 kg/m3, respectively. The average differences were(26.6±9.4) ×10-3 kg/m3 in the Huanghe River Estuary and Bohai Bay from 25.72 to 31.57 in salinity ranges. For the Huanghe River water (Jinan), the difference was 202.1×10-3 kg/m3. The relationship between the average difference and the ratio of [Ca2+]/s or [Mg2+]/s or [SO42-]/s appeared in exponential curve in all salinities, but the relationship between average difference and alkalirity exhibited S type curve. And all the ionic ratios mentioned above were linear with salinity in the salinity range from 25.72 to 31.57. The seawater average ionic ratio values of [Ca2+]/s, [Mg2+]/s, [SO42-] Was 0.012 11±1.3×10-4, 0.037 05±1.9×10-4 and 0.077 81±2.3×10-4, respectively. The high specific alkalinity and the high [Ca2+]/s ratio are the characteristics of the Huanghe Estuary and Bohai Bay seawater. They are the main factors affecting positive deviation of seawater density. |
| Key words: Huanghe River estuary, Bohai Bay, Seawater density, Ionic ratio |
