Agar Gel for Ançã Limestone Desalination

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• 作者：Joana Martins^a ; Amé ; lia Dionisio^b ; ^{amelia.dionisio@tecnico.ulisboa.pt} ; Orquí ; dia Neves^b
• 关键词：Agar gel ; limestone desalination ; salt decay ; sodium chloride
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：754-757
• 全文大小：229 K
• 卷排序：17

文摘

This study focuses on the assessment of soluble salt extraction ability of agar gel from a Portuguese limestone (Ançã). This calcareous stone was commonly used in Portugal as building and ornamental material and is very susceptible to salt decay. Samples were contaminated with NaCl and the amount of salt introduced was quantified. Two concentrations of agar gel (2% and 4% w/v) were tested and two increasing times of contact were considered: 24 and 48 hours. The assessment of the desalination effectiveness was based on electrical conductivity and concentration of chloride and the potential risks included changes in the chromatic parameters and gel residue left in the stone samples. The interaction between the gel and the stone material was evaluated with FESEM.Agar gel capability of chloride extraction showed to be lesser than 15%. No significant residues of agar gel were observed on the stone surfaces.