Total iron (Fe) and fluoride (F) in drinking water collected from Raj~angala University of Technology Phra Nakhon by using spectrophotometry method were detennined. During November 2007 and March 2008 30 drinking water samples were collected in 5 areas; Tewes Chotiwet Bangkok Commercial Chumporn Khet Udom Sale and North Bangkok. By spectrophotometric method Fe and F contained in samples were finally measured at 510 om and 570 om respectively.

The aim of this research was to develop a novel convenient low cost environmental friendly and simply method for determination of melamine in milk samples. The chemical reaction of this method was based on the complexation of melamine aldehyde and ketone called Mannich reaction. The absorption of the product complex was recorded by spectrophotometric technique at 236 nm. The method validation was good with linear range of 0.1-2.5 ppm and the limit of detection (LOD) was 0.08 ppm. The method revealed precision with %RSD values no greater than 5%. To quantitY the amount of melamine in raw milk standard addition was applied with recoveries in a range from 76-91 %.