Comparison of Optical Characteristics of Dissolved Organic Matter in Reservoirs with Different Water Source Characteristics
To investigate the differences in dissolved organic matter(DOM)in terms of molecular weight,composition,and sources between the A reservoir(a reservoir that receives water from the"Yellow River Diversion Project")and B reservoir(general type reservoir),UV-visible spectroscopy(UV-vis)and three-dimensional fluorescence spectroscopy(EEMs)combined with parallel factor analysis were used to study the absorption and fluorescence characteristics of DOM in the water of the A reservoir and B reservoir.The results showed that both reservoirs had strong autochthonous characteristics in their DOM,but there were differences in composition and sources.In the B reservoir samples,there were three fluorescence components:a long-wavelength humic-like substance C1(Ex=350 nm,Em=454 nm),a tryptophan-like substance C2(Ex=300 nm,Em=361 nm),and a tryptophan-like substance C3(Ex=220 nm/250 nm,Em=347 nm).In the A Reservoir samples,there were two fluorescence components:a long-wavelength humic-like substance C1 and a tryptophan-like substance C2,indicating that the composition of DOM in the A reservoir was relatively simpler.Analysis of the absorption characteristics of DOM showed that the water quality of the A reservoir was good,with larger molecular weight DOM mainly derived from autochthonous sources,while the B reservoir was in a eutrophic state,with smaller molecular weight DOM,higher fulvic acid content,and higher water aromaticity,mainly derived from inflowing rivers and autochthonous sources.Analysis of spectral indices showed that the proportion of exogenous input of DOM in the A reservoir was smaller than that in the B reservoir,and the pollution sources in the A reservoir were mainly from terrestrial inputs.The study reveals that the optical properties of DOM in reservoirs can reflect the degree of environmental pollution and eutrophication in reservoirs,which provides reference for further investigation of the environmental behavior characteristics of DOM in reservoirs with different water source characteristics and the protection of water quality in reservoirs.
Yellow River Diversion Projectsource water reservoirdissolved organic matter(DOM)three-dimensional fluorescence spectroscopyUV-visible spectroscopy(UV-vis)parallel factor analysis
国家科技期刊平台
NSTL
万方数据
