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This is to certify that your paper entitled «Removal of C.I. Acid Blue 25 from contaminated water by adsorption onto hardened paste of Portland cement as a lowcost adsorbent» was indexed with 6 pages, in the CIVILICA citation database, code COI:NCWW03_095, after evaluation and approval of the referees of the "3rd National Conference on Operation and Maintenance of Water and Waste Water Systems held in Tehran 2010.

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.