SbSe g

The value of the entropy of SbSe(g) calculated in [79SUL/PRU] from a combination of experimental and estimated spectroscopic data is selected  

The enthalpy of formation of SbSe(g) calculated by the review as discussed in Appendix A from the work in [79SUL/PRU] is selected  

The Gibbs energy of formation of SbSe(g) is calculated from the selected values of the enthalpy of formation and entropy, the selected entropy of selenium, and the entropy of antimony in [92GRE/FUG] yielding  

The standard enthalpy of formation of Sb2Sc2(g) is calculated by the review as discussed in Appendix A from the work in [79SUL/PRU] to be Af//° (Sb2Sc2, g, 298.15 K) = (127.2 30.0) kJ-moP. The result is not selected since it is partly based on estimated thermal properties of Sb2Sc2(g) of unknown accuracy. 

The heat eapacity of Sb2Sej(cr) was measured in the temperature range 53 to 300 K by Zhdanov [71ZHD]. The heat capacity was extrapolated to 0 K and the entropy at 298.15 K evaluated. The values of the heat capacity and entropy obtained in [71ZHD] are selected  

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Roy, G., R. Vuillemin, and J. Guyomarch. 2005. On-site determination of polynuclear aromatic hydrocarbons in sea water by stir bar extraction (SBSE) and thermal desorption (GC-MS). Talanta 66 540-546. 

SBSE can be successfully used in the analysis of environmental samples [93-97] and for food analysis [98, 99]. PDMS is the most commonly used polymer, primarily because of its thermal stability and durability. SBSE has been modified by application of derivatization with different reagents (acetic anhydride, BSTFA, etc) [100-104]. This approach is suitable for the extraction of compounds requiring derivatization. The use of multistep derivatization with several extraction elements (each reaction is performed on a different stir bar) allows efficient extraction, desorption, and chromatographic analysis of compounds with different functional groups (e.g., phenols, steroids, amines, thiazoles, ketones). Acetic anhydride (ester formation), ethyl chloroformate (reaction of acids and amines), tetraethyloborane, and sodium bis-trimethylotrifluoroacetamide have been used for extraction and simultaneous derivatization [105]. 

Huang et al. described a simple, rapid method for the quantitative monitoring of five sulfonamide antibacterial residues in milk. The analytes were concentrated by SBSE based on poly(vinylimidazole-divinylbenzene) monolithic material as coating, and analyzed by HPLC with diode-array detection. The extraction procedure was very simple. Milk was first diluted with water and then directly subjected to sorptive extraction without a requirement for additional steps to eliminate fats and protein in the samples. Under the optimized experimental conditions, low detection limits (S/N = 3) (where S/N = signal-to-noise ratio) and quantification limits (S/N = 10) were achieved for the target compounds within the range of 1.30-7.90 and 4.29-26.3 p.g/1 from spiked milk, respectively. Good linearities were obtained for the sulfonamides with correlation coefficients (R ) above 0.996. Finally, the proposed method was successfully applied to the determination of sulfonamides in different milk samples. 

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