Fotodegradación heterogénea de bisfenol A en agua con dióxido de titanio

Bisphenol A (BPA) is a monomer used in epoxy resin and polycarbonate manufacture. This molecule is considered as an endocrine disruptor that causes different diseases. The human exposition to this non biodegrable substance is increasing in the time; in particular, water is contaminated by industrial remainder flow. In this article heterogeneous photo degradation of a solution of BPA in water solution using a catalytic photo reactor with UV light and titanium dioxide (TiO2) was evaluated. High performance liquid chromatography (HPLC) was used to analyze the photo degradation of BPA solutions. The influence of titanium dioxide amount, BPA concentration, reaction temperature and the catalyst state like suspension and immobilized were also determinated. The highest elimination of BPA was 83.2%, in 240 min, beginning with 0.05 mM of BPA and 100 mg/L of TiO2 in suspension.

Validação de metodologia para a determinação simultânea dos antioxidantes sintéticos em óleos vegetais, margarinas e gorduras hidrogenadas por CLAE/UV

The use of antioxidants either to prevent or retard food's lipids oxidation was approved after inquires that verified their security within a daily intake limit. In this study, the methodology was developed and validated for the analysis of synthetic antioxidants: propylgallate (PG), tert-butylhydroquinone (TBHQ), butylhydroxyanisole (BHA), octylgallate (OG) and butylhydroxytoluene (BHT) in vegetables oils, margarine and hydrogenated fats by high performance liquid chromatographic. The methodology revealed itself efficient, with recovery rates above 90% for all antioxidant substances, besides good linearity in concentration range of 40-240 mg kg-1 (r = 0,999), repeatability with CV < 3,7% and limit of quantification 16.55, 10.32, 1.40, 3.76 and 9.30 mg/kg for BHT, BHA, PG, OG and TBHQ, respectively.

De librorum symbolicorum dignitate in ecclesia evangelico-lutherana

Dedicatio: Samuel Blomfeldt [ransk. pr.].

Determinação de metais traço no material particulado em suspensão em Ouro Preto, Minas Gerais

The determination of the airborne particulate matter (PTS) mass and trace metals concentrations were performed in three sites in Ouro Preto, MG, Brazil. It was evaluated 288 samples. The legal limit of annual geometric average (60 µg m-3) to PTS concentrations didn't exceed, but the legal limit for 24 h (240 µg m-3) did in three measurements. Seven metals (Al, Cr, Cu, Fe, Mn, Ni, Pb) analysed by ICP-AES were quantified in 18 samples. Aluminum and iron showed the highest concentrations, indicating the contribution of the soil and of one aluminum plant. The high nickel concentration is probably due to vehicular emissions and industrial combustion processes.

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1862/08/15 (A7,N148).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1862/05/15 (A7,N142).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1858/01/25 (A3,N39).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1856/10/10 (A1,N8).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1857/06/25 (A2,N25).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1864/04/01 (A9,N187).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1856/08/10 (A1,N4).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1864/05/15 (A9,N190).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1863/10/01 (A8,N175).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1861/07/01 (A6,N121).

L'Isthme de Suez : journal de l'union des deux mers / gérant Ernest Desplaces

1864/03/15 (A9,N186).