TY - JOUR ID - 8184 TI - Catalytic Kinetic Determination of Silver through its Catalytic Effect on Congo Red-Peroxodisulphate Reaction JO - Iranian Journal of Chemistry and Chemical Engineering JA - IJCCE LA - en SN - 1021-9986 AU - Pouretedal, Hamid Reza AU - Tavakkoli, Shideh AD - Department of Chemistry, Malek-e-Ashtar University of Technology, Shahinshahr, I. R. Iran AD - Department of Chemistry, Lorestan University, Khorramabad, I. R. Iran Y1 - 2003 PY - 2003 VL - 22 IS - 1 SP - 21 EP - 26 KW - Silver KW - Catalytic methods KW - Congo red KW - Spectrophotometry DO - 10.30492/ijcce.2003.8184 N2 - A kinetic-spectrophotometric procedure is reported for determination of trace amounts of Ag(I). This method is based on catalytic effect of silver ion on the oxidation of congo red by potassium peroxodisulphate at pH=3.4 and 30 oC in the presence of 1,10-phenanthroline as an activator. The reaction was followed spectrophotometrically by measuring the rate of change in absorbance of congo red at 510 nm in the range of 30-330 seconds after initiation of the reaction. Silver can be determined in the range 2-100 and 100-1100 ng/ml with detection limit 1 ng/ml. Ten replicate analysis of a sample solution containing 8 ng/ml silver gave a relative standard deviation of 1.0%. This method was used for determination of silver in water and photographic plate samples. UR - https://ijcce.ac.ir/article_8184.html L1 - https://ijcce.ac.ir/article_8184_fdc4f0e2522ba3b052e6eb1ee94b2d0a.pdf ER -