Accession Number : ADA092419


Title :   Flameless Atomic Absorption Spectroscopy: Effects of Nitrates and Sulfates.


Descriptive Note : Master's thesis,


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH


Personal Author(s) : Akerlind,Nils , Jr


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a092419.pdf


Report Date : May 1980


Pagination or Media Count : 144


Abstract : Like other analytical techniques, flameless atomic absorption is subject to matrix or interference effects. Upon heating, nitrate and sulfate salts decompose to generate oxidizing species such as nitrogen dioxide or sulfur trioxide. These concomitant oxidants are capable of gas phase reactions with the analyte atoms, thereby reducing the analyte free atom concentration and thus decreasing the analyte absorbance signal. The effects of sodium nitrate, potassium nitrate, sodium sulfate or potassium sulfate on the absorbance signal of iron, nickel, tin, chromium, silver, and copper was studied utilizing both the graphite filament atomizer and the graphite furnace atomizer. Thermodynamic calculations were employed to explain/predict the effects of oxygen on the analyte free atom concentration. An optical system was developed which allows the simultaneous measurement of the transient absorbance signal at various spatial zones with the commercial furnace atomizer. (Author)


Descriptors :   *ATOMIC SPECTROSCOPY , *ABSORPTION SPECTRA , *SULFATES , *NITRATES , OPTICAL EQUIPMENT , COMPUTATIONS , GRAPHITE , ATOMS , OXYGEN , MATHEMATICAL ANALYSIS , COPPER COMPOUNDS , OXIDIZERS , FLAMES , SALTS , NITROGEN OXIDES , CONCENTRATION(CHEMISTRY) , FURNACES , POTASSIUM COMPOUNDS , ANALYTIC FUNCTIONS , CHROMIUM COMPOUNDS , NICKEL COMPOUNDS


Subject Categories : Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE