Froudi Jahromi, Mohamad Reza, Zandifar, Samira, Pakdaman, Ehsan, Tavakoli, Fatemeh, Bagheri, Saideh. Determination of ultra trace amount Chromium in water samples with the 1-(2-PyridylAzo)-2-Naphthol, (PAN) by the bromate ion in sulfuric acid with kinetic spectrophotometric method. Journal of Physical & Theoretical Chemistry. 2016;12(4):297-306.