THE DISTRIBUTION OF LOW-LEVEL PHOSPHATE IN THE NORTHERN SOUTH CHINA SEA
THE DISTRIBUTION OF LOW-LEVEL PHOSPHATE IN THE NORTHERN SOUTH CHINA SEA
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发表时间：
2008
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通讯作者：
Yuan-Yuan Liang-Yuan
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作者：
Yuan-Yuan Liang-Yuan
用镁诱导共沉淀法(MAGIC)测定了南海北部中国海区北部海水中磷的纳摩尔级分布，优化后的方法高、低浓度测定的精密度分别为1.53%和6.63%，加标回收率分别为95.5%-98.0%。2004年2月和7月采集的冬季和夏季样品，磷酸盐的水平分布受到珠江流量的显著影响，浓度随距离的增加而减小。结果表明，冬季，珠江流量对磷酸盐的水平分布有显著影响。地表水中磷浓度变化范围为6.6-95.0nmol/L，平均值为34.6nmol/L，夏季为6.3-66.6nmol/L，平均值为17.4，低于冬季。垂直上，冬季磷酸盐剖面明显分层，磷酸盐梯度小于夏季，由此揭示了一条中线。
The distribution of phosphate in nanomolar level in the northern South China Sea was determined with magnesium-induced coprecipitation(MAGIC) method in an optimized procedure in which precisions reached 1.53% and 6.63% in recovery rate of 95.5%—98.0% for high and low level measurements,respectively.Samples collected in February and July 2004 representing winter and summer were examined.The horizontal distribution of phosphate was found sig-nificantly influenced by the Pearl River discharge,as the concentration decreased with the distance offshore.The results show that in winter,phosphate concentration in the surface water ranged 6.6—95.0 nmol/L in average of 34.6 nmol/L,while it varied 6.3—66.6 nmol/L in average of 17.4 in summer,lower than that of winter.Vertically,the phosphate profile was apparently stratified and the phosphate gradient was smaller in winter than in summer,and thus a nutricline is revealed by this low-level phosphate measurement.