Copper Distribution in Shaxi River Sediments

2011 ◽  
Vol 356-360 ◽  
pp. 1440-1444
Author(s):  
Li Hua Zhang ◽  
Cheng Song Zheng
Keyword(s):  
Heavy Metal ◽  
Soluble Fraction ◽  
Extraction Procedure ◽  
Water Soluble ◽  
Wastewater Discharge ◽  
Surficial Sediments ◽  
Iron And Steel ◽  
Water Soluble Fraction ◽  
Steel Factory ◽  
Downstream Distance

For the surficial sediments sampled from the Shaxi River in Sanming, Fujian Province, China, the distribution characteristic of heavy metal copper in surficial sediments were investigated. The microwave digestion result showed that the concentration of Cu in surficial sediments ranged from 26.95 mg/kg to 74.76 mg/kg. The results of modified BCR sequential extraction procedure showed that heavy metal copper in the surficial sediment was mainly associated with residual and reducible fractions. The fractions of copper sampled near the wastewater discharge were in the order of residual > reducible > oxidizable > acid soluble > water soluble fraction, and in the order of residual > reducible > acid soluble > oxidizable > water soluble fraction in samples away from the wastewater discharge. The results indicated that the concentration and fraction of pollutant copper were significantly correlative to the wastewater discharge of some iron and steel factory around the Shaxi River, which varied obviously with the downstream distance increasing to the wastewater discharge. The reducible and oxidizable fractions decreased with the downstream distance increasing to the wastewater discharge of iron and steel factory, however, the acid soluble fraction increased with the distance increasing.

Effect of Compost on the Distribution of Copper in Heavy Metal Contaminated Soil

2014 ◽  
Vol 1030-1032 ◽  
pp. 344-347 ◽  
Author(s):  
Hong Li Huang ◽  
Lin Luo ◽  
Jia Chao Zhang ◽  
Jiao Lian Jiang
Keyword(s):  
Heavy Metal ◽  
Contaminated Soil ◽  
Soluble Fraction ◽  
Water Soluble ◽  
Water Soluble Fraction ◽  
Cu Content ◽  
Mn Oxide ◽  
Mobility Factor ◽  
Compost Amendment ◽  
Compost Application

Pot experiments were carried out to study the effect of compost application amount on the distribution of copper in heavy metal contaminated soil. The results showed that the total Cu content reduced 11.54%, 11.60%, 22.02%, 25.27%, 7.08% and 3.65% after the amendment of 0, 20, 40, 60, 80, 100 g/kg compost to soil with Brassica juncea, respectively. The amount of water-soluble fraction had no correlation with the compost application amount. However, compost amendment decreased the proportion of Cu in the exchangeable and residual fractions, and increased the percentage of Cu in the carbonate bound, Fe-Mn oxide bound and organic-bound Cu. Furthermore, though the mobility factor of Cu decreased slightly only from 16.64% to 16.27-16.52% due to the addition of compost, the addition of compost to soil can immobilize the heavy metal through bound to organic matter and therefore, lowered their mobility and their phytotoxicity.

Modified Extraction Procedure for Direct Available P2O5 in Fertilizer

1980 ◽  
Vol 63 (3) ◽  
pp. 546-550 ◽  
Author(s):  
Rose A Sweeney
Keyword(s):  
Soluble Fraction ◽  
Extraction Procedure ◽  
Work Load ◽  
Water Soluble ◽  
Ammonium Citrate ◽  
Official Method ◽  
Triple Superphosphate ◽  
Water Soluble Fraction ◽  
Average Recovery ◽  
Relative Standard

Abstract A modification of the direct available extraction procedure for P2O5 in fertilizer is presented. The modified extraction is used in our laboratory as a screening procedure to reduce work load associated with the lengthy official method. It is applicable to samples containing diammonium phosphate or other materials except triple superphosphate. Phosphorus is extracted from fertilizers with neutral ammonium citrate without prior removal of the water-soluble fraction. Samples are extracted by shaking 1 hr at 65°C on a water bath. The extract is cooled, diluted to volume, mixed, and an aliquot is taken for analysis. Average recovery of P2O5 from 9 selected Magruder samples by the modified extraction vs. the current official extraction was 99.5%, with a range of 98.7–99.9%. This study shows that the recovery of available P2O5 is not influenced by the level of CI P2O5 in the sample. Relative standard deviations for the modified extraction ranged from 0.20 to 0.86% with an average of 0.58%; relative standard deviation for the official extraction ranged from 0.30 to 0.89% with an average of 0.57%.

Impact of Rice Flour Cold-Water-Soluble Fraction Removal on Gelatinization and Pasting Properties

2014 ◽  
Vol 91 (5) ◽  
pp. 473-481 ◽  
Author(s):  
Guiai Jiao ◽  
Xiangjin Wei ◽  
Gaoneng Shao ◽  
Lihong Xie ◽  
Zhonghua Sheng ◽  
...  
Keyword(s):  
Cold Water ◽  
Soluble Fraction ◽  
Rice Flour ◽  
Pasting Properties ◽  
Water Soluble ◽  
Water Soluble Fraction

FRACTIONATION OF LIVETIN AND THE MOLECULAR WEIGHTS OF THE α- AND β-COMPONENTS

1957 ◽  
Vol 35 (4) ◽  
pp. 241-250 ◽  
Author(s):  
W. G. Martin ◽  
J. E. Vandegaer ◽  
W. H. Cook
Keyword(s):  
Light Scattering ◽  
Soluble Protein ◽  
Soluble Fraction ◽  
Egg Yolk ◽  
Water Soluble ◽  
Water Soluble Fraction ◽  
Molecular Weights ◽  
Water Soluble Protein ◽  
Hen Egg Yolk ◽  
Hen Egg

Livetin, the major water-soluble protein of hen egg yolk, was found to contain three major components having mobilities of −6.3, −3.8, and −2.1 cm.2 sec.−1 volt−1 at pH 8, µ 0.1, and these have been designated α-, β-, and γ-livetin respectively. The α- and β-livetins were separated and purified electrophoretically after removal of γ-livetin by precipitation from 37% saturated ammonium sulphate or 20% isopropanol. The α-, β-, and mixed livetins resembled pseudoglobulins in solubility but γ-livetin was unstable and this loss of solubility has, so far, prevented its characterization. Molecular weights determined by light scattering, osmotic pressure, and Archibald sedimentation procedure yielded respectively: 8.7, 7.8, and 6.7 × 104 for α-livetin, and 4.8, 5.0, and4.5 × 104 for β-livetin. Under suitable conditions of sedimentation and electrophoresis, egg yolk has been shown to contain three components having the same behavior as the three livetins of the water-soluble fraction.

Water-soluble fraction of mercury, arsenic and other potentially toxic elements in highly contaminated sediments and soils

Chemosphere ◽  
2010 ◽  
Vol 78 (11) ◽  
pp. 1301-1312 ◽  
Author(s):  
S.M. Rodrigues ◽  
B. Henriques ◽  
J. Coimbra ◽  
E. Ferreira da Silva ◽  
M.E. Pereira ◽  
...  
Keyword(s):  
Toxic Elements ◽  
Soluble Fraction ◽  
Contaminated Sediments ◽  
Potentially Toxic Elements ◽  
Water Soluble ◽  
Water Soluble Fraction
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