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Study of aluminum phosphide levels in waste fumigants from food shipments following simple immersion treatment

100%

Wu G. , Chen T. , Jia Y. , Shen D. , Feng H. , Long Y.

tom Vol. 44, nr 1

19--27

Increasing concentrations of aluminum phosphide (AlP) in waste fumigants and residues pose a serious threat to human health. This study focused on the effectiveness of the widely used simple immersion treatment for waste fumigants from shipments, which usually have a higher concentration of residual AlP. A field survey of an operational process was conducted followed by a quantitative analysis of the immersion treatment's hydrolytic effect on AlP. Further investigation on the safety of waste fumigants after the immersion treatment was conducted. It was found that the AlP concentration in the waste fumigant varied significantly with the sampling date, ranging from 12.93 +/- 0.67 wt. % to 29.50 +/- 1.18 wt. %. Simple immersion treatment could reduce the concentration of residual AlP in waste fumigants but the hydrolytic effect varied largely ranging from 19.5% to 31.9%. The concentration of residual AlP remained high (9.1-20.1 wt. %) after the immersion treatment. About 3.2-15.2 wt. % of AlP remained in the samples, following an additional 40 days of natural air-drying when phosphine gas release was not detected. The study indicates that conventional simple immersion treatment cannot ensure the complete hydrolysis of AlP from waste fumigants of shipments.

Quantum-chemical Calculations of the Antioxidant Properties of trans-p-coumaric Acid and trans-sinapinic Acid

48%

Urbaniak A. , Molski M. , Szeląg M.

Computational Methods in Science and Technology

2012

tom Vol. 18, No. 2

XX-XX

Trans-p-coumaric and trans-sinapinic acids are cinnamic acid's derivatives which show strong antioxidant properties. In this work full optimization of both chemical structures and their radical, cation radical and anionic forms in vacuum and water medium has been performed, and antioxidant descriptors: Bond Dissociation Enthalpy, Adiabatic Ionization Potential, Proton Dissociation Enthalpy, Proton Affinity, Electron Transfer Enthalpy, Gas Phase Acidity, Free Gibbs Energy have been calculated. The Highest Occupied and Lowest Unoccupied Molecular Orbital energies have been employed to determine groups in compounds studied with the highest electron density. All calculations were performed using Gaussian 03W software package at the DFT level of theory (B3LYP hybrid functional) together with 6-311+G(2d,2p) basis set. Strong antioxidant properties of both investigated compounds were determined in this study. Based on the results it may be suggested that trans-p-coumaric and transsinapinic acids react according to the Hydrogen Atom Transfer mechanism in vacuum and according to SingleElectron Transfer followed by the Proton Transfer mechanism in water medium. Moreover, in both compounds studied the O-H bond is a preferred place of free radical attack.

Kronika

42%

Nowak W. , Demiański M. , Ajduk Z. , Wołcyrz M. , Woźnikowska-Bezak U. , Bieroń J.

1998

tom T. 49, z. 6

348-353

Nagroda im. Aleksandra Jabłońskiego. Nagroda Boltzmanna. Rotblat uhonorowany. Fizyk ministrem edukacji w Japonii. Stulecie urodzin Infelda. Francuska strategia kształcenia w naukach ścisłych. Neutrina mają niezerową masę! Polowanie na antymaterię i ciemną materię. A jednak się ociepla. Konkursy na Stypendium Naukowe i Letnie Warsztaty w INTiBS. Medal dla Kwarków. Jarmark Fizyczny w Krakowie. Komputerowa sieć bezprzewodowa. Elektroniczne Muzeum Noblowskie. Czy AIP straci tłumaczenia czasopism rosyjskich? Nuovo Cimento D łączy się z Eur. Phys. J.