Studies on macroplastics in agriculturalsoil and the characteristics of macro contaminants have rarely been conducted, contrary to the number of studies on microplastics. Nevertheless, studies on macroplastics are necessary
Humic substances have proved to be very important fractions in soils, playing a key role especially in agricultural soil and influencing chemical and physical soil properties. Spectroscopic methods are widely used to identify the quality of soil humic substances. In this study, 16 soil samples were selected from the Soil Bank of the Soil Science Laboratory at Szent István University, Gödöllő. The samples were extracted using the Hot Water Percolation (HWP) method and the amount of dissolved organic carbon (DOC) in each fraction was measured. The kinetics of the DOC extraction process with the HWP method was estimated. The Ultraviolet Visible (UV-VIS) technique was used to characterize the properties of HWP-dissolved organic carbon (HWP-DOC), measuring absorbance at 200–700 nm. Among the humification parameters, the absorbance ratios at 254 and 365 nm (E2/E3) and 465 and 665 nm (E4/E6), the specific UV absorbance (SUVA) and the UV absorbance ratio index (URI) were estimated. The K factor (humus stability coefficient) and E2/E3 and E4/E6 in NaOH and NaF extracts were also measured. The properties of HWP-DOC were similar in most of the soil samples. There was a good correlation between the content of HWP-DOC and the absorbance at 254 nm. URI, SUVA, E2/E3 and E4/E6 indicated that most of the HWP-DOC in the samples consisted of fulvic acid components with greater activity, simpler structure and low molecular weight.
Authors:N. Kamei-Ishikawa, S. Uchida, and K. Tagami
In this work, soil-soil solution distribution coefficients (Kd) of Sr and Cs were obtained for 112 Japanese agricultural soil samples (50 paddy soil and 62 upland soil samples) using batch
sorption test. The relationships between Sr-or Cs-Kd values and soil properties were discussed. Furthermore, the amount of Cs fixed in soil was estimated for 22 selected soil
samples using a sequential extraction method. Then, cross effects of some soil properties for Cs fixation were evaluated.
Authors:S. Akyil, M. Aslani, G. Gurboga, S. Aytas, and M. Eral
Fourty two soil samples were collected to a depth of 20 cm from the Aegean Region of Turkey. The activity concentrations of 226Ra in the samples were determined by a radioanalytical method. The radiochemical yield for pure 226Ra was found to be 90.02±2.74%. The average concentration of 226Ra was 0.150 Bq.g-1 and its distribution fitted a normal curve. The average absorbed dose rate was found to be 61 nGy.h-1. The data were evaluated to explain of 226Ra distribution in the agricultural area and compared with other results in the literature.
Authors:M. Vargha, Z. Somlai, Z. Takáts, and K. Márialigeti
Topp, E., Hong, Z., Nour, S. M., Houot, S., Lewis, M., Cuppels, D. (2000): Characterization of an atrazine-degrading Pseudaminobacter sp. isolated from Canadian and French agriculturalsoils. Appl. Environ. Microbiol. , 66 , 2773
have quantified the behaviour and potential transformation in temperate agriculturalsoils.
Thermal analysis (DTA, DSC, TG and dTG) has been used for decades to characterize carbonaceous materials used as fuels (oil, coal). In the last years
Authors:Ilona Kása, Sándor Molnár, and Ágota Horel
. R. , Metherell , A. K. , Clark , H. & Rys , G. , 2007 . Accounting for the utilization of a N2O mitigation tool in the IPCC inventory methodology for agriculturalsoils Nutrient Cycling and Agroecosystems . 78 . 1 – 14