Measurement of Humic and Fulvic Acid Concentrations and Dissolution Properties by a Rapid Batch Procedure

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• 作者：André ; van Zomeren ; Rob N. J. Comans
• 刊名：Environmental Science & Technology
• 出版年：2007
• 出版时间：October 1, 2007
• 年：2007
• 卷：41
• 期：19
• 页码：6755 - 6761
• 全文大小：161K
• 年卷期：v.41,no.19(October 1, 2007)
• ISSN：1520-5851

文摘

Although humic substances (HS) strongly facilitate thetransport of metals and hydrophobic organic contaminantsin environmental systems, their measurement is hamperedby the time-consuming nature of currently availablemethods for their isolation and purification. We presentand apply a new rapid batch method to measure humic (HA)and fulvic (FA) acid concentrations and dissolutionproperties in both solid and aqueous samples. The methodis compared with the conventional procedures and isshown to substantially facilitate HS concentrationmeasurements, particularly for applications such asgeochemical modeling where HS purification is not required.The new method can be performed within 1.5-4 h persample and multiple samples can be processed simultaneously, while the conventional procedures typically requireapproximately 40 h for a single sample. In addition,specific dissolution properties of HS are identified andare consistent with recent views on the molecular structureof HS that emphasize molecular interactions of smallerentities over distinct macromolecular components. Becausethe principles of the new method are essentially thesame as those of generally accepted conventional procedures,the identified HA and FA properties are of generalimportance for the interpretation of the environmentaloccurrence and behavior of HS.