Characteristics of atomic absorption calibration curves with the transversely heated graphite furnace

Model calculation of the characteristic mass for convective and diffusive vapor transport in graphite furnace atomic absorption spectrometry

“…Analogously, under mini-flow conditions, τ e should also be proportional to A int . This assumption is in accordance with the general experience of the GFAAS practice, i.e., calibration curves obtained under mini-flow conditions are linear [22][23][24][25][26]. Consequently, it provides linear relationship between A int and the absorption coefficient, related to the total absorption through the whole length of the absorbing layer as well.…”

“…Standard solutions were made in calibrated volumetric flasks by dilution of a single or multi-element (Perkin-Elmer GFAAS Mixed Standard) stock solutions with high-purity, deionized Milli-Q water (resistivity: 18 MΩ cm), and stabilized with 2% (m/v) Suprapur grade nitric acid (Merck, Darmstadt, Germany), as described elsewhere [26]. Standard solutions of Mo and V were prepared as described in Ref.…”

“…This general characteristic of the mini-flow has been suggested in a few works [27,28], partly in connection with THGAs. This condition was also found to be advantageous for decreasing the degree of halide interference effects [22][23][24][25], and also for obtaining more linear calibration curves with standard THGA tubes [24,26].…”

“…In previous papers from this laboratory, GFAAS methods were developed [21][22][23][24][25][26] for the determination of a couple of additive/trace elements in bismuth tellurite optical crystals. In these analyses, the application of mini-flow of the internal furnace gas during atomization in an end-heated graphite tube was advantageous compared to stopped flow conditions, due probably to the decreased condensation of analyte and matrix vapors in the cooler parts of the graphite furnace (e.g., the gas phase, a graphite wall and the tube ends).…”

Studies on reduction of chloride matrix interferences on determination of germanium using zirconium–ruthenium and palladium–magnesium modifiers by electrothermal atomic absorption spectrometry

“…A second order polynomial was fit to the above data Table 5 Results obtained for GBW 07312 stream sediment along with standard deviation N = 3 using slurry atomization [36] with Zr-Ru coated end capped THGA tube Certified value ± SD μg g − 1 This method ± SD μg g − 1 1.87 ± 0.08 1.90 ± 0.12 resulting in R = 0.99941 with polynomial coefficients a 0 = 0.01654, a 1 = 0.001359 and a 2 = −1.8 × 10 − 7 . The value of a 2 close to zero shows that calibration is almost linear [35]. The precision of measurements was 0.6-3% for 1.6-0.01 mg l − 1 Ge solution based on RSD of three measurements at each point of the calibration.…”