| 春季黄渤海海水中尿素分布特征及溶解态氮的组成 |
| 摘要点击 1917 全文点击 1300 投稿时间：2015-04-24 修订日期：2015-06-23 |
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| 中文关键词 氮 尿素 分布 渤海 黄海 |
| 英文关键词 nitrogen urea distribution Bohai Sea Huanghai Sea |
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| 中文摘要 |
| 2014年4~5月对黄渤海海域进行了一次大面现场调查,分别采用二乙酰一肟-盐酸氨基脲法和分光光度法测定了调查水样中尿素及各形态氮的浓度,分析了该海域尿素的浓度状况、 分布特征以及溶解态氮的基本组成,并分析了该海域尿素的主要影响因素. 结果表明,春季黄海渤海海域尿素的浓度范围是0.21~2.17 μmol ·L-1,平均浓度为(0.84±0.20)μmol ·L-1. 各调查海区中,北黄海海域尿素平均浓度最高,南黄海浓度最低. 同时结果表明尿素是调查海域中溶解有机氮(DON)的重要组成部分,占DON的7.90%. 在黄海海域尿素浓度由近岸到远海逐渐降低,高值区主要位于大连、 青岛等人口密度较高且离岸较近城市的外海海域. 渤海海域尿素浓度呈现由近岸到远海依次增加的趋势,说明河流输入不是渤海尿素的主要来源,同时也可能存在着河口附近泥沙对有机氮的吸附作用. |
| 英文摘要 |
| Based on the investigation of the Huanghai Sea and the Bohai Sea in Spring(April to May) of 2014, the concentrations of urea and inorganic nitrogen were determined respectively by diacetyl monoxime-Semicarbazide Hydrochloride method and Spectro-photometric method. The distribution of urea and the component of dissolved nitrogen were analyzed. The influencing factors of urea were also discussed. The results showed that the concentration of urea in the Bohai sea and the Huanghai sea ranged from 0.21-2.17μmol ·L-1, and the average concentration was (0.84±0.20)μmol ·L-1. Urea was an important component of the dissolved organic nitrogen(DON) and accounted for 7.90% of DON. In the investigated area, the average concentration of urea in the north Huanghai sea was the highest, and that in the south Huanghai sea was the lowest. The concentration of urea in the Huanghai sea gradually reduced from inshore to offshore. The areas with high concentrations of urea were near the coastal cities like Qingdao and Dalian where have high population density. The concentration of urea in Bohai sea gradually increased form inshore to offshore, this result indicated that the river input was not the primary source and this might be caused by adsorption of colloid flocculation. |
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