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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0.21~2.17μmol·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.
From April to May 2014, a large field survey was conducted on the Yellow Sea and the Bohai Sea. The concentrations of urea and various forms of nitrogen in water samples were determined by diacetylmonooxime-hydrochloric acid semicarbazide and spectrophotometry respectively. The results showed that the concentrations of urea in the Bohai Sea in the Yellow Sea ranged from 0.21 to 2.17μmol·L-1, and the average concentrations of urea (0.84 ± 0.20) μmol·L-1, respectively.The average urea concentration in the northern and northern Yellow Sea was the highest and lowest in the southern Yellow Sea at the same time.The results showed that urea was an important component of dissolved organic nitrogen (DON) DON was 7.90% .The concentration of urea in the Yellow Sea gradually decreased from near shore to distant sea, and the high value areas were mainly located in the offshore areas of Dalian and Qingdao which have higher population densities and cities close to offshore.The concentrations of urea in the Bohai Sea ranged from near shore to The increasing trend of distant sea in turn indicates that river input is not the main source of urea in the Bohai Sea. At the same time, the adsorption of organic nitrogen by sediment near the estuary may also exist.