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Transport parameters of selected neonicotinoids in different aquifer materials using batch sorption tests

Pietrzak Damian, Kania Jarosław, Kmiecik Ewa

Geology, Geophysics and Environment

2022

Vol. 48, no. 4

367--379

Contamination of surface and groundwater by neonicotinoids is a global problem and requires comprehensive action by individual countries in order to identify in detail the processes affecting the transport of these pesticides, their properties, and their harmfulness to the environment. The aim of this study was to assess the transport (expressed by sorption parameters) of selected neonicotinoids in the aquatic environment, using batch tests. Tests were carried out for acetamiprid individually and a mixture of five neonicotinoids (acetamiprid, clothianidin, imidacloprid, thiacloprid, and thiamethoxam), for three different aquifer materials and quartz sand. Based on the obtained values of the sorption parameters, the greatest sorption of neonicotinoids was observed on soil with the highest content of organic matter and clay minerals content, while no sorption of these pesticides was observed on quartz sand. In addition, it was noticed that individual neonicotinoids undergo sorption to a different degree — thiacloprid was the most sorbed (R-value in the range 3.13–26.03), while thiamethoxam was the least (R-value in the range 1.89–8.41).

Stanowisko do pomiaru opóźnienia i prędkości metodami statystycznymi

Hanus R., Zając G.

Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika

2005

z. 28 [223]

301-304

W artykule przedstawiono stanowisko badawczo-dydaktyczne złożone modelu laboratoryjnego obiektu przemysłowego oraz komputera PC z kartą pomiarową PCI-6024E i oprogramowaniem napisanym w LabVIEW. Stanowisko umożliwia wykonywanie pomiarów opóźnienia i prędkości sześcioma metodami statystycznymi oraz prowadzenie badań właściwości tych metod.

In this article the laboratory set for time delay and velocity measurement by use of some statistical methods is described. The system consists from model of industrial conveyor belt, PC with PCI-6024 DAQ device and software written in LabVIEW.

Electrical and optical properties of sol-gel derive ZnO: Al thin films

Sagar P., Kumar M., Mehra R. M.

Materials Science Poland

2005

Vol. 23, No. 3

685--696

High quality sol-gel derived ZnO and ZnO: Al thin films were deposited on corning 7059 glass substrate by spin coating technique. The annealed films showed c-axis preferred orientation. The structural electrical and optical properties of the films were investigated as a function of Al concentration from 0 to 3.0 at%. A maximum conductivity of 18.86. omega-1*cm-1 with carrier concentration of 2.2 x 1024 m-3 was found for Al concentration of 0.8 at%. The conductivity is found to be activated type above 375 K and variable range hopping conduction is observed below room temperature. Various transport parameters such as average spacing between donors, effective Bohr radius, donor levels, Debye screening length and average grain size have been estimated. The increase in band gap with Al doping is explained in terms of Burstein Moss shift.