The Chemistry of Lead and Cadmium in Soil: Solid Phase Formation

1975 ◽  
Vol 39 (5) ◽  
pp. 851-856 ◽  
Author(s):  
Javier Santillan-Medrano ◽  
J. J. Jurinak
Keyword(s):  
Phase Formation ◽  
Solid Phase ◽  
Lead And Cadmium ◽  
Soil Solid Phase

The Primary and Secondary Analysis of Uncertain Factors in Soil Thermal Properties for GSHP

2012 ◽  
Vol 614-615 ◽  
pp. 688-694 ◽  
Author(s):  
Yi Wang ◽  
Guo Min Shen
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Water Table ◽  
Unsaturated Soil ◽  
Solid Phase ◽  
Saturated Soil ◽  
Soil Thermal Conductivity ◽  
Saturation Degree ◽  
Soil Thermal Properties ◽  
Soil Solid Phase

In this paper, at first, an effective soil thermal conductivity model was established. Single factor regression analysis for 6 uncertain factors contained in the model was then conducted respectively. Finally, the primary and secondary characters of these uncertain factors were analyzed by using the orthogonal test. The analysis results show that the effective soil thermal conductivity has linear relationships with the saturation degree of unsaturated soil and the depth of water table and has power function relationships with other 4 uncertain factors; the porosity of unsaturated soil has the greatest effect on the effective soil thermal properties, followed by saturation degree of unsaturated soil, porosity of saturated soil, solid phase thermal conductivity of unsaturated soil, solid phase thermal conductivity of saturated soil and the depth of water table.

scholarly journals Solid phase selective separation and green preconcentration of Cu, Zn, Pb and Cd in drinking water by using novel functionalized resin

2009 ◽  
Vol 7 (4) ◽  
pp. 945-954 ◽  
Author(s):  
Nagwa Burham ◽  
Sami Azeem ◽  
Mohamed El-Shahat
Keyword(s):  
Drinking Water ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Exchange Capacity ◽  
Coupling Reactions ◽  
Lead And Cadmium ◽  
Sample Flow Rate ◽  
Relative Standard ◽  
Copper Zinc ◽  
Ph Range

AbstractA new solid — phase extraction sorbent was developed based on stepwise anchoring of two ligand molecules for the determination of copper, zinc, lead and cadmium in drinking water by flame AAS. Amberlite XAD-2 functionalized with 4′-(2-hydroxyphenylazo)-3′-methyl-1′-phenyl-2′-pyrazolin-5′-one (HPAPyr) was utilized for preconcentration/separation of these elements. The sorbent was prepared by two successive azo coupling reactions. First, 2-aminophenol was anchored to the amino groups in the resin resulted from nitration followed by reduction. Then, the resulted 2-aminophenol functionalized resin was further diazotized and coupled to the pyrazolone compound and the final product HPAPyr-XAD-2 was characterized by IR and elemental analysis. The optimum pH range for sorption, shaking time, exchange capacity, sample flow rate, preconcentration factor and interference from co-existing ions were investigated. All metal ions were quantitatively desorbed from the resin by 4.5 mol L−1 nitric acid solution. The sorbent provides limit of detection within the range 0.9–3.3 µg L−1 and concentration factor up to 250. The procedure was validated by analysis of certified material NIST-SRM 1577b. Application to drinking water showed satisfactory results with relative standard deviation RSD ≤ 8.5%.

Solid-phase formation of transistor emitters at low temperature

1972 ◽  
Vol 60 (8) ◽  
pp. 1018-1018 ◽  
Author(s):  
A.M. Fern ◽  
J.O. McCaldin
Keyword(s):  
Low Temperature ◽  
Phase Formation ◽  
Solid Phase

Solid-phase dispersive microextraction using reduced graphene oxide for the sensitive determination of cadmium and lead in waters

2019 ◽  
Vol 11 (5) ◽  
pp. 635-641 ◽  
Author(s):  
Ignacio López-García ◽  
Juan José Marín-Hernández ◽  
Manuel Hernández-Córdoba
Keyword(s):  
Graphene Oxide ◽  
Cloud Point Extraction ◽  
Solid Phase ◽  
Lead And Cadmium ◽  
Low Concentrations ◽  
Reduced Graphene ◽  
Dispersive Microextraction ◽  
Sensitive Determination ◽  
Cadmium And Lead

The combination of cloud point extraction with ETAAS measurement allows very low concentrations of lead and cadmium to be determined.

scholarly journals The Release of Antimony from Mine Dump Soils in the Presence and Absence of Forest Litter

2018 ◽  
Vol 15 (12) ◽  
pp. 2631 ◽  
Author(s):  
Karolina Lewińska ◽  
Anna Karczewska ◽  
Marcin Siepak ◽  
Bernard Gałka
Keyword(s):  
Solid Phase ◽  
Forest Litter ◽  
Underground Water ◽  
Beech Forest ◽  
Threshold Values ◽  
Mining Sites ◽  
Experimental Treatments ◽  
Moisture Conditions ◽  
Mine Dump ◽  
Soil Solid Phase

This study examined the changes in antimony (Sb) solubility in soils, using organic matter introduced with forest litter, in various moisture conditions. Soils containing 12.8–163 mg/kg Sb were taken from the top layers of dumps in former mining sites in the Sudetes, South-West Poland. Soils were incubated for 90 days either in oxic or waterlogged conditions, with and without the addition of 50 g/kg of beech forest litter (FL). Water concentrations of Sb in some experimental treatments greatly exceeded the threshold values for good quality underground water and drinking water, and reached a maximum of 2.8 mg/L. The changes of Sb solubility caused by application of FL and prolonged waterlogging were, in various soils, highly divergent and in fact unpredictable based on the main soil properties. In some soils, the application of forest litter prompted the release of Sb from soil solid phase, while in the others it acted contradictorily. Soil waterlogging resulted, in most cases, in the increased release of Sb compared to oxic conditions, and this effect was enhanced by the addition of forest litter. However, in two soils the presence of forest litter counteracted the effects of waterlogging and diminished the quantities of released Sb.

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