Influence Of Soil Composition Research Articles

Geochemical aspects of the aetiology of trace element related diseases

Abstract Deficiencies, excesses or imbalances in the supply of inorganic elements from dietary sources can have an important influence on animal and human health and susceptibility to disease. Many such situations arise from anomalies in the inorganic element composition of food chains. These, in turn, are frequently attributable to the composition of the geochemical environment as modified by the influence of soil composition and botanical or cultural variables upon the inorganic composition of the diet. Appreciation of the epidemiological importance of such factors in the aetiology of nutritional diseases can contribute, very significantly, to their detection and effective control. Although the agricultural relevance of geochemical data is firmly established and widely appreciated, investigation of its value in the context of anticipation and control of major human nutritional diseases in the third world has yet to be undertaken adequately.

Gamma Ray Fields in the Air Due to Sources in the Ground

Air kerma per unit source density at 12 heights up to 300 m above the ground was calculated using a Monte Carlo method for monoenergetic plane sources in and on the ground and for natural radionuclides uniformly distributed in the ground. In the case of plane sources, calculations were performed for 18 photon energies from 10 keV to 5 MeV and for 22 source depths expressed in mass per unit area ranging from 0 to 200 g.cm −2 . For natural nuclides, the whole lines compiled in a recent nuclear data file were taken into account. Double differential photon fluences in air with respect to energy and incident angle were also calculated for all cases, and the general features were discussed. The influence of soil composition upon air kerma was investigated for two different kinds of soil

The influence of soil composition on bioremediation of PAH‐contaminated soils

AbstractAs a result of former industrial activities, many properties across the United States contain various chemicals in their soils at concentrations above background levels. Polynuclear aromatic hydrocarbons (PAHs) are often encountered at sites of gas manufacture, wood treating, tar refining, coke making, and petroleum reflning. When the presence of PAHs in site soil is deemed to create a situation of unacceptable risk to public health or the environment, treatment or disposal is required to reduce concentrations to acceptable levels.The ideal remedial process for PAHs in soils would destroy them to an environmentally sound level at relatively low cost without producing adverse by‐products. In many cases bioremediation can accomplish these goals. The degree to which bioremediation can destroy PAHs in a particular soil, however, is highly dependent on the characteristics of that soil, including the nature of the hydrocarbon that is the source of the PAHs.It is the objective of this article to describe efforts leading to this conclusion and to summarize how soil characteristics influence bioremediation of PAHs.

Influence of soil composition on the vegetation of the Coolac serpentite belt in New South Wales

Influence of soil composition on the vegetation of the Coolac serpentite belt in New South Wales

The Thermal Conductivity of Soils

The thermal conductivity of soils of varying moisture content is calculated on a physical basis. The results of this computation are, in a range of moisture contents from 5 to 25 percent, in agreement with experimental data in the literature. The influence of soil composition on conductivity is also explained by the theory. The use for practical purposes of an average resistivity value of 60 to 70 thermal ohms appears justified in the light of this analysis.