Experimental Analyses of the Physiochemical Parameters for Concentration Distribution in a Polluted Soil Medium

Oil extracted from Persea Americana seed was assayed for its physiochemical properties and antioxidant potential using various standard methods. The oil content of the seed was found to be < 10%. Brownish-red color oil was liquid at room temperature, with specific gravity of 0.91±0.02 g/mL. Other physiochemical parameters determined were; acid value (4.51±0.08 mgKOH/g), %FFA (2.26±0.08), peroxide value (2.40±0.57 mgO2/Kg), ester value (31.26±0.03 mgKOH/g), saponification value (35.76±0.07 mgKOH/g) and iodine value (23.5±0.07). The results of the antioxidant activities of the seed oil showed that the flavonoid content (80.00±1.41 mgQE/g) was ~10 folds higher than the phenolic content (8.27±0.06 mgGAE/g). The DPPH radical scavenging value was found to be 51.54±0.25% with an IC50 value of 4.68±0.02 mg/mL and reducing power with an average absorbance of 0.85±0.01 and an IC50 value of 0.001±0.02 mg/mL. Gallic acid showed better antioxidant activities than the oil studied. The results obtained in this study showed that Persea Americana seed oil has nutritional, industrial as well as medicinal potentials.

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Numerical simulation of dust concentration distribution regularities of down-the-hole drilling in open-pit mine

JOURNAL OF SHENZHEN UNIVERSITY SCIENCE AND ENGINEERING ◽

10.3724/sp.j.1249.2013.03313 ◽

2013 ◽

Vol 30 (3) ◽

pp. 313-318 ◽

Cited By ~ 6

Author(s):

Zhongan Jiang ◽

Lan Jiang ◽

Jushi Chen

Keyword(s):

Numerical Simulation ◽

Concentration Distribution ◽

Open Pit Mine ◽

Dust Concentration ◽

Open Pit ◽

Hole Drilling

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Applications of Bentonite to Soil Decontamination

Revista de Chimie ◽

10.37358/rc.18.7.6397 ◽

2018 ◽

Vol 69 (7) ◽

pp. 1695-1698

Author(s):

Marin Rusanescu ◽

Carmen Otilia Rusanescu ◽

Gheorghe Voicu ◽

Mihaela Begea

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Laboratory Experiments ◽

Experimental Studies ◽

Heavy Metal Concentration ◽

Polluted Soil ◽

Raw Material ◽

Soil Decontamination ◽

Metal Retention ◽

Removal Of Heavy Metals

A calcium bentonite from Orasu Nou deposit (Satu Mare Romania) was used as raw material. We have conducted laboratory experiments to determine the influence of bentonite on the degree of heavy metal retention. It has been observed that the rate of retention increases as the heavy metal concentration decreases. Experimental studies have been carried out on metal retention ( Zn) in bentonite. In this paper, we realized laboratory experiments for determining the influence of metal (Zn) on the growth and development of two types of plants (Pelargonium domesticum and Kalanchoe) and the effect of bentonite on the absorption of pollutants. These flowers were planted in unpolluted soil, in heavy metal polluted soil and in heavy metal polluted soil to which bentonite was added to observe the positive effect of bentonite. It has been noticed that the flowers planted in unpolluted soil and polluted with heavy metals to which bentonite has been added, the flowers have flourished, the leaves are still green and the plants whose soils have been polluted with heavy metals began to dry after 6 days, three weeks have yellowish leaves and flowers have dried. Experiments have demonstrated the essential role of bentonite for the removal of heavy metals polluted soil.

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Uniform Horizontal Groundwater Flow against Dispersion in a Shallow Aquifer: Two Analytical Models

Hydrology Research ◽

10.2166/nh.1992.0001 ◽

1992 ◽

Vol 23 (1) ◽

pp. 1-12

Author(s):

Ram Raj Vinda ◽

Raja Ram Yadava ◽

Naveen Kumar

Keyword(s):

Point Source ◽

Groundwater Flow ◽

Cross Section ◽

Analytical Solutions ◽

Concentration Distribution ◽

Analytical Models ◽

Shallow Aquifer ◽

Horizontal Cross Section ◽

Flow Components ◽

Reactive Pollutant

Analytical solutions converging rapidly at large and small values of times have been obtained for two mathematical models which describe the concentration distribution of a non reactive pollutant from a point source against the flow in a horizontal cross-section of a finite saturated shallow aquifer possessing uniform horizontal groundwater flow. Zero concentration or the conditions in which the flux across the extreme boundaries are proportional to the respective flow components are applied. The effects of flow and dispersion on concentration distribution are also discussed.

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Measured and Modelled Chlorinated Contaminant Distributions in the St. Clair River Water

Water Quality Research Journal ◽

10.2166/wqrj.1986.029 ◽

1986 ◽

Vol 21 (3) ◽

pp. 332-343 ◽

Cited By ~ 4

Author(s):

C.H. Chan ◽

Y.L. Lau ◽

B.G. Oliver

Keyword(s):

River Water ◽

Suspended Sediment ◽

Water Samples ◽

Concentration Distribution ◽

Suspended Solids ◽

Industrial Area ◽

Concentration Profiles ◽

Detroit River ◽

Chemical Partitioning ◽

Transverse Mixing

Abstract The concentration distribution of hexachlorobutadiene (HCBD), pentachloro-benzene (QCB), hexachlorobenzene (HCB) and octachlorostyrene (OCS) in water samples from transects across the upper and lower St. Clair River and the upper Detroit River were determined on four occasions in 1985. The data show a plume of these contaminants from the Sarnia industrial area. The fluxes and concentration profiles of the contaminants at Port Lambton have been modelled success fully using a simple transverse mixing model. A study on the chemical partitioning between the “dissolved” and “suspended sediment” phases shows that an important contaminant fraction is carried in the river by the suspended solids, particularly for lipophilie compounds such as HCB and OCS,

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Hydrodynamic Dispersion Coefficient of Urea in Silty Loam Soil

Journal of AgriSearch ◽

10.21921/jas.v6i04.16901 ◽

2019 ◽

Vol 6 (04) ◽

Author(s):

RAM PAL ◽

H C SHARMA ◽

M IMTIYAZ

Keyword(s):

Transport Phenomenon ◽

Porous Medium ◽

Contaminant Transport ◽

Dispersion Coefficient ◽

Hydrodynamic Dispersion ◽

Soil Columns ◽

Soil Medium ◽

Adverse Health Effects ◽

Silty Loam ◽

Loam Soil

The modern theme of agriculture is not only to increase production but also to minimize undesirable environmental effects. Leaching of surface-applied fertilizer is the major source of groundwater pollution. Nitrogenous fertilizers are the most popular among the Indian farmers, which on leaching reach the groundwater in different forms (NH4-N, NO3-N, etc). NO3-N leaches faster than other types, remains in-reactive in groundwater, moves with the velocity of groundwater and contaminates it. Contamination arises when NO3-N accumulates in groundwater and consumed in high amount by humans and animals, may result in adverse health effects. For the study of contaminant transport phenomenon in porous medium, a general convection dispersion equation is used, in which dispersion coefficient is one of the primary parameters necessary to be determined for a particular soil. Keeping it in view a study was conducted to assess different available techniques to determine the dispersion coefficient with the help of soil columns having silty loam soil as soil medium. The value of the dispersion coefficient obtained for silty loam soil, by this method was equal to 0.00576 m2.

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