14th-century painting of the assassination of Nizam al-Mulk by an assassin. The Assassins (from Persian: Ø­Ø´ÛØ´ÛØ§Ù ââ Arabic: Ø­Ø´ÙØ§Ø´ÙÙ â á¸¤ashshÄshÄ«n) is the name used to refer to the medieval Nizari Ismailis, particularly those of Persia and Syria.t is said that the Assassins are the ancestors of those given the surname Hajaly, derived from the word hajal, a rare species of bird found in the mountains of Syria near Masyaf. The hajal (bird) was often used as a symbol of the Assassin's order.
1 Use the colorimeter to measure the absorbance of the water sample and the standard solutions across a range of wavelengths. Choose a suitable wavelength for the rest of the experiments.  As a group, decide on how you will need to dilute the standard solutions.
Colorimeters. A colorimeter uses a light source of a particular wavelength, a color-changing, colorimetry reagent, and a light detector to determine the concentration of a particular substance, usually in an aqueous or water-based sample. colorimeter is commonly used to test the concentration of disinfectants like chlorine used in drinking water, pool and spa applications, industrial wastewater plants, paper manufacturing, and other industries.