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引用本文:时丹,丁士明,许笛,白秀玲,范成新.利用薄膜扩散平衡技术分析沉积物间隙水溶解态反应性磷.湖泊科学,2009,21(6):768-774. DOI:10.18307/2009.0603
SHI Dan,DING Shiming,XU Di,BAI Xiuling,FAN Chengxin.Determination of soluble reactive phosphorus in porewaters of sediments using the technique of diffusive equilibration in thin films. J. Lake Sci.2009,21(6):768-774. DOI:10.18307/2009.0603
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利用薄膜扩散平衡技术分析沉积物间隙水溶解态反应性磷
时丹1,2, 丁士明2, 许笛2, 白秀玲2, 范成新2
1.南京农业大学环境工程系, 南京 210093;2.中国科学院南京地理与湖泊研究所, 南京 210008
摘要:
沉积物间隙水溶解态反应性磷(SRP)是反映沉积物磷地球化学特征的敏感指标,对其高分辨率获取一直是难点.基于薄膜扩散平衡(DET)原理,以琼脂糖为原料制备薄膜,通过平衡、切片、提取、测定等步骤,获得溶解态反应性磷的含量信息.实验确定薄膜在磷溶液中的平衡时间为24h,通过0.25mol/L硝酸提取16h可将薄膜萃取的磷提取完全.利用DET技术对不同沉积物间隙水SRP进行了分析,与实际浓度的差异在±5%以内;对沉积物剖面的分析结果与Rhizon、微型Peeper等采样技术基本一致,垂直分辨率可达到3mm左右.利用DET技术对太湖草型和藻型湖区沉积物间隙水SRP进行了分析,发现草型湖区间隙水剖面SRP呈峰形分布,且横向空间分异明显;藻型湖区间隙水SRP随沉积深度的增加呈升高趋势,扩散梯度随水温升高而增强.
关键词:  薄膜扩散平衡技术  间隙水  溶解磷  高分辨率
DOI:10.18307/2009.0603
分类号:
基金项目:国家高技术研究发展计划项目(863计划)(2007AA06Z411);国家自然科学基金项目(40601087)联合资助
Determination of soluble reactive phosphorus in porewaters of sediments using the technique of diffusive equilibration in thin films
SHI Dan1,2, DING Shiming2, XU Di2, BAI Xiuling2, FAN Chengxin2
1.College of Resource and Environmental Science, Nanjing Agriculture University, Nanjing 210093, P.R.China;2.Nanjing Institue of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
Abstract:
Distribution of soluble reactive phosphate (SRP) in pore waters is a sensitive indicator showing geochemical properties ofphosphorus in sediments. Concentration of SRP in synthetic solutions was obtained based on the principle of diffusive equilibration inthin films (DET). Analytical procedure generally includes equilibration of the gels in solutions or pore waters, section of the gels afterretrieval, back elution of phosphorus in the gels, and analysis of SRP in the eluents. Equilibrium and extraction times weredetermined at 24h and 16h, respectively, with 0.25mol/L HNO3 used as an extractant. Concentrations of SRP in pore waters ofdifferent sediments measured by using the established DET technique agree well with its actual values, and the variations aregenerally within ±5%. Analytical results for sediment profiles with this technique, which has a vertical resolution at about 3mm, alsoshow comparison with those using sampling techniques of Rhizon and Mini-Peeper. The established DET technique was used tomeasure SRP profiles in sediments of macrophyte- and algal-dominated regions in Lake Taihu. Peak-shape distribution and horizontalheterogeneity of SRP were observed in macrophyte-dominated region, while an upward and increasing movement of SRP wasobserved in algal-dominated region with an increase in water temperature.
Key words:  Diffusive equilibration in thin films  pore water  soluble reactive phosphate  high resolution
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