Radionuclide content vs grain size in soil samples

1988 ◽  
Vol 69 ◽  
pp. 379-389 ◽  
Author(s):  
H. Surbeck ◽  
H. Voelkel
Keyword(s):  
Grain Size ◽  
Soil Samples ◽  
Radionuclide Content

scholarly journals Effect of the Grain Size of the Soil on the Measured Activity and Variation in Activity in Surface and Subsurface Soil Samples

2014 ◽  
Vol 57 (3) ◽  
pp. 129-138
Author(s):  
Tabassum Nasir ◽  
Huda Al-Sulaiti ◽  
Patrick Henry Regan ◽  
David Bradley ◽  
Khulud Al-Mugren ◽  
...  
Keyword(s):  
Grain Size ◽  
Soil Samples ◽  
Subsurface Soil ◽  
Measured Activity

scholarly journals Assessment and Analysis of Precambrian Basement Soil Deposits Using Grain Size Distribution

2020 ◽  
Vol 66 (4) ◽  
pp. 235-243
Author(s):  
Gideon Layade ◽  
Charles Ogunkoya ◽  
Victor Makinde ◽  
Kehinde Ajayi
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Textural Properties ◽  
Soil Samples ◽  
Sieve Analysis ◽  
Precambrian Basement ◽  
Statistical Parameters ◽  
Fine Grained ◽  
Transportation History

AbstractThe article presents the grain size distribution of soil samples from the Precambrian basement within the purview of the textural properties, deduced transportation history and the numerical assessments using statistical parameters. The fourteen soil samples collected from the study area were subjected to sieve analysis in the laboratory for the determination of their grain size distribution. The statistical parameters’ study includes the graphic mean, skewness, sorting and kurtosis. The result of the analysis of the soil samples ranged from coarse to fine-grained samples, moderately and poorly sorted, positively and negatively skewed and the kurtosis also shows leptokurtic as the most dominant which suggests the samples poorly distributed and moderately sorted at the centre of the grain size distribution. These results also suggest the geological environment of the soil samples could be responsible for the poorly and moderately sorted exhibited by the samples deposited in the location.

ETUDE SYSTEMATIQUE DE LA VARIABILITE D’UN SOL PODZOLIQUE, LE LONG D’UNE TRANCHEE DANS UNE ERABLIERE A BOULEAU JAUNE

1979 ◽  
Vol 59 (2) ◽  
pp. 131-146 ◽  
Author(s):  
J.-L. BROWN
Keyword(s):  
Grain Size ◽  
Organic Matter ◽  
Sandy Soil ◽  
Sugar Maple ◽  
Podzolic Soil ◽  
Chemical Properties ◽  
Soil Samples ◽  
Soil Morphology ◽  
Morphological Variations ◽  
Regular Cycle

In a 16.5-m long trench dug in a podzolic soil under a sugar maple-yellow birch stand, principal morphological variations have been studied and soil samples have been taken systematically. The study of soil morphology, combined with that of free Fe and Al and organic matter, for the first 10 cm of B horizon, shows the existence of nine statistically different changes in podzolization intensity along that trench. The coefficient of variation (CV) of principal chemical properties varies generally from large (> 30%) to very large (> 60%) so that except for pH, a large number of samples is required to estimate their means with a precision of ± 10% of that mean (α = 95%). As far as grain size components of this sandy soil are concerned, the CV is low (< 11%) for sand, larger for silt (24%) in B(10 cm) horizon and always large (> 35%) for clay, which is not very abundant. Since these soil variations do not follow a regular cycle, the choice of pedon to describe this soil is especially difficult.

How do grain size and dose of sunflower husk biochar influence the water retention of sandy soil?

2020 ◽  
Author(s):  
Anna Rafalska-Przysucha ◽  
Radosław Szlązak ◽  
Justina Vitková ◽  
Łukasz Gluba ◽  
Mateusz Lukowski ◽  
...  
Keyword(s):  
Grain Size ◽  
Water Content ◽  
Soil Water ◽  
Sandy Soil ◽  
Water Retention ◽  
Soil Samples ◽  
Satellite Monitoring ◽  
Soil Water Retention ◽  
Available Water ◽  
Plant Available Water

&lt;p&gt;Biochar is a carbon-rich material obtained from the process of biomass pyrolysis. Due to its desirable properties, it is discussed as a soil amendment to improve soil quality; for example, adding biochar can change soil water retention by modifying soil textural and structural properties. However, the optimal fabrication conditions and proportions of biochar particles sizes, that would improve soil properties are still not precisely known. In our research, we investigated the influence of grain size and a dose of biochar on water retention of sandy soil. For this purpose, water retention curves (pF) were measured, as it indicates such important properties as plant available water, field water capacity, wilting point. The studies were carried out on podzol soil samples taken from meadow located in Sekow, Poland, mixed with different percentage mass content of sunflower husk biochar produced in 650-750&amp;#176;C (0.95, 2.36, 4.76 and 9.52% of sample weight). Samples contain one of biochar granulometric fraction: 250-100, 100-50 or less than 50 &amp;#181;m. The control included soil samples with the addition of mixed fractions of biochar and soil without biochar. The research method we used allows obtaining information about plant available water content by comparing differences in water content between 0.06 and 5 bar pressure points which corresponding to a 1.85-3.7 pF. In this range, most plants can use water for their growth and development. Our results revealed that, surprisingly, soil with all fractions of biochar reduces the amount of available water for plants compared to the control (soil without biochar), regardless of the biochar dose applied. However, fractionated biochar can both increase or decrease the soil water content, depending on the particle size and dose. Small doses of sunflower husk biochar (0.95 and 2.36%) and the finest fraction (&lt;50&amp;#956;m) have the most beneficial effects for water retention of investigated soil. Our research may strongly suggest the biochar producers that the production of biochar with the right fraction may be more favourable for increasing soil water retention.&amp;#160;&lt;/p&gt;&lt;p&gt;Research was partially conducted under the project &amp;#8220;Water in soil - satellite monitoring and improving the retention using biochar&amp;#8221; no. BIOSTRATEG3/345940/7/NCBR/2017 which was financed by Polish National Centre for Research and Development in the framework of &amp;#8220;Environment, agriculture and forestry&amp;#8221; &amp;#8211; BIOSTRATEG strategic R&amp;D programme.&lt;/p&gt;

scholarly journals The Effect of Differences Leachate Concentration and Material Properties on Electrical Conductivity of Volcanic Deposits – Case Studies Piyungan Landfill Bantul Yogyakarta

2016 ◽  
Vol 1 (1) ◽  
pp. 29
Author(s):  
Jaingot A. Parhusip ◽  
Agung Harijoko ◽  
Doni Prakasa Eka Putra ◽  
Wiwit Suryanto
Keyword(s):  
Electrical Conductivity ◽  
Grain Size ◽  
Physical Properties ◽  
Soil Layer ◽  
Clay Content ◽  
Soil Samples ◽  
Disposal Site ◽  
Alluvial Deposits ◽  
Clayey Silt ◽  
Geoelectrical Resistivity

Monitoring at the contaminated subsurface soil, have been conducted by using the geophysical surface method, especially for geoelectrical resistivity method. Monitoring is commonly conducted by using geoelectrical resistivity through measuring the value of Electrical Resistivity (ER) or Electrical Conductivity (EC) of leachate contaminated soil layer. EC measurement value of soil is affected by many factors, among others, particle conduction of soil materials, surface conduction, fluid conduction in the pores as well as the effect of particle shape and soil materials. Piyungan landfill is the main disposal site of Yogyakarta municipal solid waste. This landfill located mainly on the tertiary rocks of volcanic rocks and its weathering products. In order to improve the accuracy of geoelectrical measurements on resistivity in monitoring soil layers from contaminated leachate on this area, this research conducted several measurements on physical properties of soil sample and electrical properties of leachate in the saturated soil samples. The measurement of physical properties includes: porosity, clay content, particle content, and cation exchange capacity (CEC) value. The soil samples were collected from 3 locations around Piyungan Landfill. Type of soils are taken from the alluvial deposits (Sample B), weathered tuffaceous sandstone-claystone (Sample D), and weathered andesitic breccia (Sample F). Samples were made in containers, saturated with aquades-leachate solution with 12 different concentration levels. Electrical conductivity (EC) was measured by using Soil Box Miller and Geoelectric Resistivity Oyo McOhm. According to results of physical properties analysis, the grain size of soils are dominantly sandy clayey silt in grain size distribution, with clay content ranging from 33.0--38.4 %, the CEC values ranging from 26.8--52.7 meq/100 gr, and the porosity of samples B, D and F is 58.85 %, 55.30 %, 59.24 %, respectively. Based on the experiments with 12 different leachate concentrations, there is a linear increase in EC of 0.718mS/cm for every increase in electrical conductivity pore fluid (ECf ) 1 mg/l in samples B, while in samples D and F are 0.492 mS/cm and 0.284 mS/cm respectively. Plotting the data of EC vs ECf for each samples and ER vs ECf , it can be concluded the slope ofDEC/DECf differ for each samples and the electrical conductivity value of different concentration of leachate is very sensitive for alluvial deposits compare to the weathered tuffaceous sandstone-claystone and weathered volcanic breccia deposits.

scholarly journals An Empirical Model to Estimate Abundance of Nanophase Metallic Iron (npFe0) in Lunar Soils

2020 ◽  
Vol 12 (6) ◽  
pp. 1047 ◽  
Author(s):  
Dawei Liu ◽  
Yuanzhi Zhang ◽  
Guangliang Zhang ◽  
Bin Liu ◽  
Xin Ren ◽  
...  
Keyword(s):  
Grain Size ◽  
Empirical Model ◽  
Metallic Iron ◽  
Compositional Data ◽  
Lunar Soil ◽  
Soil Samples ◽  
Space Environment ◽  
Remotely Sensed Data ◽  
Lunar Soils ◽  
Size Groups

Lunar soils gradually become mature when they are exposed to a space environment, and nanophase metallic iron (npFe0) generates within them. npFe0 significantly changes the optical properties of lunar soils and affects the interpretation of the remotely sensed data of the lunar surface. In this study, a correlation analysis was conducted between npFe0 abundance and reflectance spectra at short wavelengths for lunar soil samples in four size groups based on their spectral and compositional data, collected by the Lunar Soil Characterization Consortium (LSCC). Results show that 540 nm single scattering albedo (SSA) of lunar soils correlates well with their corresponding npFe0 abundance for each size group of lunar soil samples. However, it is poorly correlated with npFe0 abundance when all size groups were considered because of the strong interference from grain size variation of lunar soils. To minimize the effect of grain size, the correlation of npFe0 abundance with the spectral ratio of 540 nm/810 nm SSA of all size groups for LSCC samples was calculated and results show that a higher correlation existed between them (R2 = 0.91). This ratio can serve as a simple empirical model for estimating npFe0 abundance in lunar soils. However, bias could be introduced to the estimation result when lunar soils possess a high content of agglutinitic glass and ilmenite. Our future work will focus on improving the model’s performance for these lunar soils.

Statistical Characterisation of Grain-Size Distribution in Fluvial Sediment of Kelantan Rivers

2015 ◽  
Vol 74 (3) ◽  
Author(s):  
Wan Hanna Melini Wan Mohtar ◽  
Siti Aminah Bassa Nawang ◽  
Mojtaba Porhemmat
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Coarse Sand ◽  
Soil Samples ◽  
Size Distributions ◽  
Mean Grain Size ◽  
Grain Size Distributions ◽  
Size Standard ◽  
Sand And Gravel ◽  
Skewness And Kurtosis

The characteristic of sediment, in particular the particle size distribution is important to be correctly determined for an accurate representation in sediment transport. This article reports the grain size distributions of soil samples taken from seven tropical rivers i.e. the Sungai (Rivers) of Sam, Galas, Lata Tunggil, Mei, Rek, Peng Datu and the major Sungai Kelantan catchment area which spanned about 11, 900 km2. The Sungai Galas is a direct tributary, whilst the Sungai Sam, Sungai Rek, Sungai Mei and Sungai Lata Tunggil are the tributaries into Sungai Lebir which subsequently feeds the Sungai Kelantan. Each obtained sample was sieved and the soil type distribution was determined. Statistical analysis of the samples was conducted; including the median grain size , mean grain size, standard deviation (sorting), skewness and kurtosis. Most of the samples have insignificant fractions of finer grains, where coarse sand and gravel were the dominant. All sediment samples are negatively skewed towards coarse sand, have very platykurtic kurtosis suggesting that the sediment has single provenance.

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