Factors influencing the atomization of vanadium in graphite furnace AAS

VAPO as catalyst for liquid phase oxidation reactions. Part II: stability of VAPO-5 during catalytic operation

“…The shape of the signal was comparable to those shown in literature [11]. Since the signal tails the peak area rather than peak height was used for the calibration.…”

“…The interference of 3-octanol is stronger than found for 3-phenyl-2-propen-1-ol. It was checked if the formation of non-volatile vanadium carbides [ 11 ] was the cause of the too low absolute values by measuring the vanadium signal during the cleansing of the oven, but no vanadium could be detected. All analyzes presented in this article were carried out using 1-propanol as dilutant.…”

“…To circumvent these problems the concentration of the metal ion (in this case vanadium) in solution has to be determined accurately. Because the concentration of vanadium in solution is expected to be low (<10 mg V/I) and the amount of sample low (<1 ml) GF-AAS (Graphite Furnace Atomic Absorption Spectroscopy) was the method of choice [10], [11]. Moreover, some samples were analyzed for aluminium by GF-AAS to be sure that no VAPO particles passed through the filter.…”

Determination of Leachable Vanadium (V) in sediment

“…13 Some problems, such as tailing of the absorbance signal, carbide formation and acid interferences have been encountered [13][14] . Atomization of vanadium from a matrix with a relatively high amount of Na 2 CO 3 was investigated using the temperature programme presented in Table 1.…”

“…Three samples were treated with 0.1 M Na 2 CO 3 solution without addition of spikes and the average quantity of vanadium obtained was taken as a base value 14 . Subsequently, increasing quantities of V(V) were added to other aliquots and vanadium (+5) was determined according to the recommended procedure.…”