Spectrophotometric Determination of 1- Naphthylamine by Diazotization and Coupling with 8-Hydroxyquinoline

Israa Jarjees, Sameer Sa'eed
2020 Journal of education and science  
A spectrophotometric method for the assay of micro amount of 1naphthylamine (1-NPA) has been suggested .The method based on the reaction with nitrite ion to form the corresponding diazonium salt followed by coupling reaction in a alkali medium of sodium hydroxide with 8-hydroxyquaniline to form stable and a soluble orange azo dye. The intensity of absorbance for the resulting orange azo dye is measured at 492.5 nm and. Beer's law is obeyed in the concentration range of 2.5-125 g of 1-NPA in a
more » ... 5 g of 1-NPA in a final volume of 25 ml, with a molar absorptivity of 2.505 10 4 L.mol -1 .cm -1 , a relative error of 0.16 to + 0.65 % and a relative standard deviation of  0.37 to 0.98 %, depending on the concentration level of 1-NPA .The method has been successfully applied for the assay of 1-NPA in river water. Keywords: 1-naphthyamine, 8-hydroxy quinolone, Diazotization and copling, spectrophotometric determination and river water. ‫لــ‬ ‫الظيفي‬ ‫التقدير‬ 1 -‫مع‬ ‫ان‬ ‫االقتر‬ ‫و‬ ‫الديازومتري‬ ‫بظريقة‬ ‫أمين‬ ‫نفثيل‬ 8 -‫كهينهلين‬ ‫هيدروكدي‬ ‫سعيد‬ ‫عبدالرحيم‬ ‫سمير‬ ‫جرجيس‬ ‫اسعد‬ ‫اء‬ ‫اسر‬ ‫الكيسياء‬ ‫قدم‬ -‫العمهم‬ ‫كمية‬ ‫االثير‬ ‫ابن‬ ‫مدتذفى‬ ‫السهصل‬ ‫جامعة‬
doi:10.33899/edusj.2020.164359 fatcat:6i4zd6msc5gspgqaiwrbigqepy