Using chromatographic and spectroscopic parameters to characterize preference and kinetics in the adsorption of humic and fulvic acid to goethite
Using chromatographic and spectroscopic parameters to characterize preference and kinetics in the adsorption of humic and fulvic acid to goethite
复制标题
使用色谱和光谱参数来表征针铁矿吸附腐殖酸和黄腐酸的偏好和动力学
DOI：
10.1016/j.scitotenv.2019.02.235
复制
发表时间：
2019
影响因子：
9.8
通讯作者：
Chen Yali
中科院分区：
文献类型：
--
作者：
Wang Long;Li Yongtao;Weng Liping;Sun Yang;Ma Jie;Chen Yali
腐殖质（HS）是一种异质性很强的物质，在与矿物相互作用过程中，某些组分会发生优先吸附。结果表明，对于黄腐酸（FA），较大的颗粒（3.6-18.2 kDa）对针铁矿的吸附效果较好，而对于腐植酸（HA），中等大小的颗粒（3.6-12.0 kDa）的吸附效果较好。摩尔质量（Mw）和比紫外吸收值（SUVA）与紫外吸收比（E2/E3, E4/E6）之间存在相关性。吸附不改变E2/ e3与Mw、E4/ e6与SUVA的关系。E2/ e3和E4/ e6可以作为HS的摩尔质量和芳香性指标，用于研究HS的优先吸附。针铁矿对HA和FA的吸附速度快，在6 h左右达到稳定状态。中等大小的HA颗粒（3.6-12.0 kDa）被快速吸附，随后部分被较大的颗粒（>50 kDa）所取代。对于FA，相对较大的颗粒（3.6-18.2 kDa）的优先吸附速度较快，并且具有较高芳香性的颗粒的替代作用有限。如果不明确所研究的HS的性质，特别是摩尔质量范围，那么使用不同HS材料的研究可能会产生混乱。
Humic substances (HS) are very heterogeneous, and preferential adsorption of certain components takes place during their interaction with minerals. Our results indicated that for fulvic acid (FA) the relatively large (3.6–18.2 kDa) particles were preferred in the adsorption to goethite, whereas for humic acid (HA) the intermediate sized (3.6–12.0 kDa) fractions were preferred. Correlations between molar mass (Mw) and specific UV absorption values (SUVA) with ratios of UV light absorbance (E2/E3, E4/E6) were observed. The adsorption did not change the relation between E2/E3and Mw, E4/E6and SUVA. The E2/E3and E4/E6can probably be used as indicators of molar mass and aromaticity of HS in studying the preferential adsorption. The adsorption of HA and FA to goethite was fast and reached a steady state in about 6 h. The intermediate sized HA particles (3.6–12.0 kDa) were adsorbed quickly, and part of them was subsequently replaced by somewhat larger particles (>50 kDa). For FA, preferential adsorption of relative large particles (3.6–18.2 kDa) took place quickly, and there was a limited substitution by particles with higher aromaticity. Without specifying the property especially the molar mass range of HS under study, confusion can arise from researches using different HS materials.