QuiCSI Team and LMC, Institute of Chemistry, University of Brasília, C.P.4478, 70904-970 Brasilia D.C., Brazil.
Talanta. 2011 May 15;84(3):759-65. doi: 10.1016/j.talanta.2011.02.003. Epub 2011 Feb 12.
Biodiesel and diesel-like have been obtained from soybean oil by transesterification and thermal cracking process, respectively. These biofuels were characterized as according to ANP standards by using specific ASTM methods. Ethanol, gasoline, and diesel were purchased from a gas station. Deacetylation degree of chitosan was determined by three distinct methods (conductimetry, FTIR and NMR), and the average degree was 78.95%. The chitosan microspheres were prepared from chitosan by split-coating and these spheres were crosslinked using glutaraldehyde. The surface area of microspheres was determined by BET method, and the surface area of crosslinked microspheres was 9.2m(2)g(-1). The adsorption isotherms of cooper, nickel and zinc on microspheres of chitosan were determined in petroleum derivatives (gasoline and diesel oil), as well as in biofuels (alcohol, biodiesel and diesel-like). The adsorption order in all fuels was: Cu>Ni>Zn. The elution tests presented the following preconcentration degrees: >4.5 to ethanol, >4.4 to gasoline, >4.0 to diesel, >3.8 to biodiesel and >3.6 to diesel-like. The application of chitosan microspheres in the metal ions preconcentration showed the potential of this biopolymer to enrich fuel sample in order to be analyzed by flame atomic absorption spectrometry.
生物柴油和类似柴油已分别通过酯交换和热裂化工艺从豆油中获得。这些生物燃料根据 ANP 标准，使用特定的 ASTM 方法进行了表征。乙醇、汽油和柴油均从加油站购买。壳聚糖的脱乙酰度通过三种不同的方法（电导率法、FTIR 和 NMR）进行测定，平均脱乙酰度为 78.95%。壳聚糖微球通过分裂涂层法由壳聚糖制备，并用戊二醛交联这些球体。通过 BET 法测定微球的表面积，交联微球的表面积为 9.2m(2)g(-1)。在石油衍生物（汽油和柴油）以及生物燃料（酒精、生物柴油和类似柴油）中，测定了铜、镍和锌在壳聚糖微球上的吸附等温线。在所有燃料中的吸附顺序为：Cu>Ni>Zn。洗脱试验呈现出以下预浓缩程度：>4.5 至乙醇、>4.4 至汽油、>4.0 至柴油、>3.8 至生物柴油和>3.6 至类似柴油。壳聚糖微球在金属离子预浓缩中的应用表明，这种生物聚合物具有在火焰原子吸收光谱法分析之前富集燃料样品的潜力。
