Determination of the Photoelectric Properties for Ammonia Concentrations using USB-2000 Spectrometer

Abstract

Ammonia is an essential chemical raw material and it can be used as raw material and solutions for synthetic numerous organic compounds. Five samples of ammonia solutions were prepared in different concentrations (200, 150, 100, 50 and 7.5 mg/L), the solutions were subjected to spectrometer absorbance and transmission for wavelength between (340-540 nm) to determine the photoelectric properties of the ammonia solutions. The results showed that rapid increase of the absorption at 466 nm, compatible with the increase of photon energy, the effects of concentration on absorbance value increased with concentration decrease of absorbance values. rapid decrease in low energies and sudden decrease in special energies and it continuous with decrease at 466 nm, concentration increase refers to the decrease in transparent value. rapid increase in reflection values. The absorption coefficient (α) for all samples
were found in the visible region, variation at the (K) values obtained in the visible region, meanwhile, the variation of (n) vs (λ) is revealed maximum value of (n) is (1.0022) for all samples at the same wavelength. the values of (Eg) obtained were 200 mg/L = 2.4996 eV, 150 mg/L = 2.4956 eV, 100 mg/L = 2.4929 eV, 50 mg/L = 2.4916 eV and 7.5 mg/L= 2.4902 eV. The value of (Eg) was decreased from (2.4996) eV to (2.4902) eV. The decreasing of (Eg) related to decrease in concentration.