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This is to certify that your paper entitled «Use natural absorbent chitosan nanocomposite-tragacanth removal of metal chromium (VI)The aqueous solution» was indexed with 22 pages, in the CIVILICA citation database, code COI:CMRCE05_184, after evaluation and approval of the referees of the "Fifth National Conference on new research in chemistry, chemical engineering and oil held in Mahshahr 2016.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.