Calibration Techniques and Modifiers for the Determination of Cd, Pb and Tl in Biodiesel as Microemulsion by Graphite Furnace Atomic Absorption Spectrometry

被引:25
作者
Azevedo Silva, Jessee S. [1 ,2 ]
Chaves, Eduardo S. [2 ]
dos Santos, Eder J. [3 ]
Saint'Pierre, Tatiana D. [4 ]
Frescura, Vera Lucia A. [2 ]
Curtius, Adilson J. [2 ]
机构
[1] Inst Fed Educ Ciencia & Tecnol Santa Catarina, BR-88047240 Florianopolis, SC, Brazil
[2] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, Brazil
[3] TECPAR, Inst Tecnol Parana, BR-81350010 Curitiba, Parana, Brazil
[4] Pontificia Univ Catolica Rio de Janeiro, Dept Quim, BR-22453900 Rio De Janeiro, Brazil
关键词
GF AAS; biodiesel; microemulsion; cadmium; lead; thallium; chemical modifier; PLASMA-MASS SPECTROMETRY; VEGETABLE-OILS; POLLUTED SOILS; DIESEL OIL; EMISSIONS; GASOLINE; SAMPLES; LEAD; REMEDIATION; STABILITY;
D O I
10.1590/S0103-50532010000400006
中图分类号
O6 [化学];
学科分类号
070301 [无机化学];
摘要
Different calibration approaches and modifiers were tested for Cd, Pb and Tl determination in biodiesel by graphite furnace atomic absorption spectrometry (GF AAS). Microemulsions were prepared by mixing 2 g of biodiesel, 1 mL of a 10% (v/v) nitric acid aqueous solution and n-propanol to a 10 mL final volume. Pyrolysis temperatures of 600 degrees C for Cd and Tl with Pd as permanent modifier, and 800 degrees C for Pb with Ru as permanent modifier were used. Atomization temperatures were also optimized. Calibration solution prepared in aqueous medium did not correct non-spectral interferences, but matrix matching calibration using base oil led to accurate results with recoveries from 80 to 116%. The RSD values were lower than 8% for Cd and Pb and the LOD values were 0.5 ng g(-1) for Cd, 6 ng g(-1) for Pb and 1 ng g(-1) for Tl. The obtained results using the analyte additions method or by matrix matching calibration were in agreement, confirming the accuracy of the proposed procedure. Organometallic standards were not required and different samples were analyzed.
引用
收藏
页码:620 / 626
页数:7
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