Evaluation Of Tannin From Rhizophora Apiculata As Rust Converter

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Date
2005-03
Authors
Santoso, Henny Simulo
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Abstract
The main objective of this research is to formulate rust c9nverter formulations based on tannin and to evaluate their rust conversion performance. The tannins that were used in this study were extracted from mangrove (Rhizophora apiculata) barks which are the waste product from charcoal industry. The extraction of mangrove bark with 70 % aqueous acetone produced 23.6 % mixed tannin, which contained 12.3 % hydrolysable tannin and 8.7 % condensed tannin. The quantifications of tannin have been carried out by several assays, such as Prussian blue assay for total phenolic determination; vanillin assay to estimate condensed tannin, Stiasny test to provide the estimation of the total flavanoid that react with formaldehyde. The identification of the tannin monomer of condensed tannin was carried out by reverse phase HPLC. Treatment of rust powder with various percentage of tannin solution resulted in the transformation of iron rust products into ferric tannate or other iron phase products. In single pack rust converter formulations based on tannin, the FTIR study showed that a mixture of phosphoric acid and tannin is more effective than the tannin or phosphoric acid alone in converting or transforming the iron rust products. Rust converter which contained 9 % of tannin had been showed to be able to convert completely all the iron rust products. Rust converter based on a polyvinyl-butyral resin (PVBR) containing tannin in combination with zinc phosphate in the ratio of 1 : 1 had great potential as rust converter. Using tannin or zinc phosphate alone was not effective as rust converter.
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To formulate rust converter formulations , based on tannin
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