摘要
根据2006年4月、7月、11月和2007年1月对桑沟湾进行的调查,分析了溶解态Al和颗粒态Al的分布及季节变化。结果表明,桑沟湾溶解态Al的分布呈现出明显的季节变化,夏季最高,浓度为(64.1±45.1)nmol/L,春秋季次之,浓度分别为(60.8±29.1)nmol/L和(60.3±15.5)nmol/L,冬季最低,浓度为(31.2±9.6)nmol/L。因悬浮颗粒物的类型不同,春季和冬季颗粒物中Al的含量较高,夏季和秋季含量较低;颗粒物中可交换态Al所占的比例为春季和夏季比较高,夏季醋酸提态所占的比例可高达(2.19±0.88)%,颗粒物中Al主要以残渣态存在。讨论了颗粒物对溶解态Al分布的影响并计算了Al在颗粒物表面的分配系数及其在海水中的存留时间,Al的界面分配系数Kd的范围为0.24×105～1.3×106mL/g,平均值为(3.6×105±2.6×105)mL/g,其中SPM的范围为8.0～60.6 mg/L。根据箱式模型初步估算了桑沟湾溶解态Al的存留时间约为(36±17)d,进一步认识了Al的生物地球化学行为。
The distributions of dissolved and particulate aluminum were investigated in the Sanggou Bay in Apr.July and Nov of 2006 and Jan of 2007.The distributions of dissolved aluminum in the Sanggou Bay showed the obvious seasonal variations.The concentrations of dissolved aluminum in four seasons were（60.8±29.1） nmol/L,（64.1±45.1） nmol/L,（60.3±15.5） nmol/L and（31.2±9.6） nmol/L,respectively.Due to different types of suspended particulate matter,the concentrations of particulate aluminum were higher in the spring and the winter than in the summer and the autumn.The exchangeable portion of the particulate aluminum was high in the spring and the summer,which could reach as high as（2.19±0.88）% in the summer.Partitioning of aluminum between solid and solution phases was described by distribution coefficient,Kd,which varied from 0.24×10^5 nmol/L to 1.3×10^6 mL/g with a mean of（3.6×10^5±2.6×10^5） mL/g.Based on the simple box model,a residence time of（36±17） days for dissolved aluminum also was worked out.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2010年第6期843-847,共5页
Marine Environmental Science
基金
国家重点基础研究专项经费资助项目(2006CB400601)
国家自然科学基金(40606028)
关键词
AL
桑沟湾
分布
季节变化
分配系数
aluminum； Sanggou Bay； distribution； seasonal variation； distribution coefficient
