Observationes quasdam circa varios modos acquirendi dominii

Arkit: 1 arkintunnukseton lehti, A4 B2.

Fama regis ex Oriente venturi

Invocatio: I.N.J.

Incrementorum scientiae chemicae remoras, leviter adtingens

Invocatio: D.F.G.

An mysterium S.S. Trinitatis veteribus Scandianis sub gentilismo fuerit cognitum?

Invocatio: I.N.D.O.M.

De collisione inter honestum & utilitatem publicam

Invocatio: D.O.D.

Fama regis ex Oriente venturi

Invocatio: I.N.J.

De cultura

Dedicatio: Esaias Wegelius.

Anmärkningar angående thermometrars förfärdigande och bruk

Arkit: 1 arkintunnukseton lehti, A4 B2.

De astrologia judiciaria

Invocatio: [Alpha et Omega].

De Ate Homerica [et] Hesiodea

Dedicatio: Joseph Bremer [ruots. pr.], Abrahamus Paulin, Arvidus Paulin.

Vaticinia Jesaiae in Idumaeos latine versa

Dedicatio: Abrahamus Fellman.

Specimen commentationis in bina loca Optices Isaaci Newtoni

Invocatio: Q.F.F.Q.S.

Uso da cromatografia gasosa bidimensional abrangente (GC×GC) na caracterização de misturas biodiesel/diesel: aplicação ao biodiesel de sebo bovino

The growth of biodiesel market and the implementation of regulations related to biodiesel production and biodiesel/diesel blending has encouraged the development of appropriate analytical methods to control the composition of this type of mixture. In this study, an evaluation of the potential of GC×GC for the characterization of samples of beef tallow biodiesel and the composition of blends of biodiesel/diesel is presented. The methodology was applied to beef tallow biodiesel and its mixtures with petrodiesel, ranging from B2 to B50. Results allowed not only the identification and quantification of the biodiesel esters, but also the biodiesel percentage in biodiesel/diesel blends.

Análises quali e quantitativas de micotoxinas em águas da cadeia produtiva do arroz por CCD e CCDAE

This study validated a simple and applied method for determining mycotoxins aflatoxin B1, aflatoxin B2, ochratoxin A, zearalenone and deoxynivalenol, in water from the rice production chain. Five solvent combinations for extraction were tested, with quantification performed by TLC/HPTLC and confirmation by LC-MS/MS. Mycotoxins in water from field and rice industries were evaluated. Mycotoxin recovery levels were around 90%. Two samples from rice parboiling waste were contaminated (deoxynivalenol/aflatoxin B1, 110/9 ng mL-1; and deoxynivalenol, 100 ng mL-1). Zearalenone, deoxynivalenol and ochratoxin A (36, 30 and 28%) were carried to soaking water during parboiling.

DETERMINAÇÃO DO TEOR DE BIODIESEL EM DIESEL EMPREGANDO O ENSAIO COLORIMÉTRICO DO ÁCIDO HIDROXÂMICO

The aim of this paper was to use colorimetric assays for hydroxamic acid to quantify the biodiesel content in diesel and compare it with the traditional method (infrared spectroscopy, using the EN 14078 method). Samples were prepared from B2 to B10 with two kinds of diesel - S500 (red) and S50 (yellow) - to obtain two calibration curves. Through statistical methods it was shown that the slopes of the straight lines obtained for the different types of diesel were the same. Thus, the type of diesel did not influence the results of the colorimetric assay for hydroxamic acid. Real samples collected from gas stations were analyzed by both methods (colorimetry and EN 14078). By applying Student's t-test it was concluded that the methods could be considered statistically equivalent. Therefore, it was confirmed that the colorimetric assay for hydroxamic acid is suitable for detecting and quantifying the content of biodiesel in biodiesel/diesel blends and can also be easily adapted to field analyses.