Relations between soil properties and the 1 M NH 4 NO 3 soluble mobile element fraction

2010 ◽  
Vol 59 (1) ◽  
pp. 109-116 ◽  
Author(s):  
M. Rékási ◽  
T. Filep
Keyword(s):  
Risk Assessment ◽  
Detection Limit ◽  
Soil Contamination ◽  
Soil Properties ◽  
Soil Ph ◽  
Soil Property ◽  
Mobile Element ◽  
Background Concentrations ◽  
Soil Colloid

The aim of the present study was to establish whether the 1MNH4NO3extraction is a suitable method for determining the background concentrations of mobile element fractions in soils and for describing the relations among mobile element fractions and soil properties. The 1MNH4NO3extraction resulted As, Cr and Pb concentrations below the detection limit in 90% of the investigated soils. This shows that the mobile element content determined simply in 1MNH4NO3solution is probably inadequate for the determination of the mobile background concentrations of these elements. Therefore, in the risk assessment of soil contamination other soil properties and element fractions – like “total” (cc. HNO3+H2O2soluble) – should also be taken into consideration. The mobile Al concentration increased exponentially below pH 4. No correlation was found among 1MNH4NO3soluble mobile As, Cr, Cu and Pb element concentrations and any investigated soil property. Mobile Co, Mn, Al, Ni and Zn concentrations were determined mainly by soil pH. Soil colloid content correlated particularly with mobile Sr and B contents.

scholarly journals Effect of manure, clay, charcoal, zeolite, and calcium oxide on some properties of soil contaminated with cobalt

2017 ◽  
Vol 68 (3) ◽  
pp. 149-154 ◽  
Author(s):  
Milena Kosiorek ◽  
Mirosław Wyszkowski
Keyword(s):  
Soil Contamination ◽  
Soil Properties ◽  
Calcium Oxide ◽  
Soil Ph ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Base Saturation ◽  
Exchangeable Bases ◽  
Properties Of Soil ◽  
Hydrolytic Acidity

Abstract The study has been undertaken in order to determine the influence of different substances (manure, clay, charcoal, zeolite and calcium oxide) on soil pH, hydrolytic acidity, total exchangeable bases, cation exchange capacity, the base saturation of soil contaminated with cobalt (0, 20, 40, 80, 160, 320 mg·kg−1 of soil). The analysed properties of soil proved to be dependent on the cobalt contamination and the kind of substances. In the series without substances soil contamination with the highest doses of cobalt raised the soil’s hydrolytic acidity but depressed its pH, total exchangeable bases and base saturation. Among the substances applied to soil in order to neutralize the effect of contamination with cobalt, calcium oxide had the strongest influence on the soil’s properties. In the series with calcium oxide application the hydrolytic acidity was decreased and other soil properties were increased. Manure addition to soil had positive but weaker effect on analysed soil properties.

Methods of pH determination in calcareous soils: use of electrolytes and suspension effect

Soil Research ◽  
2005 ◽  
Vol 43 (4) ◽  
pp. 541 ◽  
Author(s):  
A. Al-Busaidi ◽  
P. Cookson ◽  
T. Yamamoto
Keyword(s):  
Soil Properties ◽  
Soil Solution ◽  
Soil Ph ◽  
Soil Salinity ◽  
Calcareous Soils ◽  
Saline Soils ◽  
Distilled Water ◽  
Suspension Effect ◽  
Objective Being

Determination of pH assists in understanding many reactions that occur in soil. However, measured values of soil pH can be affected by the procedure used for determination and by a range of soil properties. In this study, pH was measured in different electrolytes [distilled water (pHw), 0.01 m CaCl2 (pHca), 1 m KCl (pHk), and 0.01 m BaCl2 (pHba)] with different soil : solution ratios (i.e. 1 : 1, 1 : 2.5, 1 : 5), the main objective being to study the influence of different electrolytes on the suspension effect of pH in calcareous soils. Soil pH measured in water showed significant differences between different dilution ratios and was highly influenced by the ‘suspension effect’. Other electrolytes (CaCl2, KCl, BaCl2) were little affected by the suspension effect, giving approximately stable values when pH was measured with and without stirring. High soil salinity appeared to suppress any suspension effect in a manner similar to electrolytes when added to non-saline soils.

Applying the Method of Lagrange Multipliers to Derive an Estimator for Unsampled Soil Properties

2014 ◽  
Vol 11 (1) ◽  
pp. 15
Author(s):  
Set Foong Ng ◽  
Pei Eng Ch’ng ◽  
Yee Ming Chew ◽  
Kok Shien Ng
Keyword(s):  
Soil Properties ◽  
Lagrange Multipliers ◽  
Unbiased Estimator ◽  
Soil Property ◽  
Minimum Variance ◽  
Distance Method ◽  
True Value ◽  
A Site ◽  
Method Of Lagrange Multipliers ◽  
Inverse Distance

Soil properties are very crucial for civil engineers to differentiate one type of soil from another and to predict its mechanical behavior. However, it is not practical to measure soil properties at all the locations at a site. In this paper, an estimator is derived to estimate the unknown values for soil properties from locations where soil samples were not collected. The estimator is obtained by combining the concept of the ‘Inverse Distance Method’ into the technique of ‘Kriging’. The method of Lagrange Multipliers is applied in this paper. It is shown that the estimator derived in this paper is an unbiased estimator. The partiality of the estimator with respect to the true value is zero. Hence, the estimated value will be equal to the true value of the soil property. It is also shown that the variance between the estimator and the soil property is minimised. Hence, the distribution of this unbiased estimator with minimum variance spreads the least from the true value. With this characteristic of minimum variance unbiased estimator, a high accuracy estimation of soil property could be obtained.

Colorimetric Determination of Fluoride in Drinking Groundwater using a Polymeric Zirconium Complex of 5-(2-Carboxyphenylazo)-8-Hydroxyquinoline

2013 ◽  
Vol 12 (7) ◽  
pp. 460-465
Author(s):  
Sameer Amereih ◽  
Zaher Barghouthi ◽  
Lamees Majjiad
Keyword(s):  
Drinking Water ◽  
Detection Limit ◽  
Complex Formation ◽  
Molar Absorptivity ◽  
Colorimetric Determination ◽  
Zirconium Complex ◽  
Reliable Determination ◽  
Percentage Recovery ◽  
Quantitation Limit

A sensitive colorimetric determination of fluoride in drinking water has been developed using a polymeric zirconium complex of 5-(2-Carboxyphenylazo)-8-Hydroxyquinoline as fluoride reagents. The method allowed a reliable determination of fluoride in range of (0.0-1.5) mg L-1. The molar absorptivity of the complex formation is 7695 ± 27 L mol-1 cm-1 at 460 nm. The sensitivity, detection limit, quantitation limit, and percentage recovery for 1.0 mg L-1 fluoride for the proposed method were found to be 0.353 ± 0.013 μg mL-1, 0.1 mg L-1, 0.3 mg L-1, and 101.7 ± 4.1, respectively.

Methods of risk assessment in forecasting the consequences of accidents at pipeline transport facilities

2020 ◽  
Vol 10 (6) ◽  
pp. 663-673
Author(s):  
Vladislav N. Slepnev ◽  
◽  
Alexander F. Maksimenko ◽  
Elena V. Glebova ◽  
Alla Т. Volokhina ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Evaluation Method ◽  
Assessment Procedure ◽  
Expert Evaluation ◽  
Main Pipeline ◽  
Pipeline Transport ◽  
Forecasting Accuracy ◽  
Distribution Of Resources ◽  
Expert Evaluation Method

The choice of risk assessment procedure is one of the essential stages of efficient structuring of processes on prevention, localization and elimination of the consequences of accidents at main pipeline transport facilities. The authors analyzed themed publications and regulatory documents, governing procedures of risk assessment and forecasting of the consequences of possible accidents, and defined main problems in this area. Procedure for the risk assessment of accidents at main pipeline facilities was developed, the basis of which is the expert evaluation method. The procedure includes the determination of the main criteria for the assessment the probability of accident initiation and development and the evaluation of the severity of its consequences, an expert evaluation of criteria significance, their classification, and creation of a rating for hazardous pipeline sections. The application of the procedure application allows to specify the list of facilities that require high priority forecasting of accidents consequences, thus to optimize the distribution of resources and the overall increase of efficiency in planning while defining forces and special technical devices, necessary for containment and rectification of emergencies. Expert evaluation method application allows considering the specifics of certain enterprises, their technical and technological peculiarities, thereby increasing forecasting accuracy.

Sign in / Sign up

Export Citation Format

Share Document