List of Articles Spectrophotometery Open Access Article Abstract Page Full-Text 1 - Trace Amounts Determination of Vanadium (V) Using a New Kinetic-Catalytic Reaction System M. R. Shishehbore R. Jokar H. Dashti Khavidaki Open Access Article Abstract Page Full-Text 2 - Determination of the stability constant of Cobalt (ІІ) – Piroxicam complex by spectrophotometery Mohammad Edrisi Nima Razzaghi Asl Omid Moradi Sara Shahabipoor Sajjad sedaghat Mohammad yari Open Access Article Abstract Page Full-Text 3 - Study of exteraction of trace diazepam in water samples using Modified NanoTube carboxyl as sorbent ali moghimi Milad Abniki Fatemeh Hajikarimi Open Access Article Abstract Page Full-Text 4 - Preconcentration of trace amounts of lorazepam in aqueous samples by functionalizing graphene oxide with 2-aminopyridine ali moghimi Milad Abniki