摘要
本文研究了河、湖、海水腐殖酸和河流、湖泊沉积物腐殖酸的可见-紫外光谱特征,结果表明,水样腐殖酸与水体沉积物腐殖酸的可见-紫外吸收曲线显著不同,其差异不仅表现在以E240/E420为代表的紫外/可见吸收比上,也反映在以所有样品在不同波长的吸收值为原始变量进行聚类分析得到的结果中。三种水样腐殖酸中,河水与湖水腐殖酸的单位浓度紫外吸收值(以220nm为代表)十分接近,而海水腐殖酸的该值明显偏低。分别计算淡水和海水腐殖酸数据,则紫外吸收值与腐殖酸浓度之间有很好的线性关系。
Spectroscopic examination of humic substances from river, lake and sea water as well as from river and lake sediments in the UV-VIS region indicated that the E240/E420) ratios of water humic substances differ significantly from those of sediment humic substances. A cluster analysis based on the absorption spectra of the humic substances revealed a similar fact. Considering the humic substances from fresh water and sea water respectively, linear relationship between the optical density and the total organic carbon content of the samples implied that a spectrophotometric method (e.g. at 220 nm) for determination of humic substances concentration is possible.
出处
《地理学报》
EI
CSSCI
CSCD
北大核心
1990年第4期484-489,共6页
Acta Geographica Sinica
基金
国家自然科学基金项目
关键词
海
河
湖
水样
腐殖酸
紫外光谱
humic substances
UV-VIS absorption spectra
cluster analysis
