An Improved Method for Determination of Heavy Metal Bioavailability in Contaminated Soil

2001 ◽  
Vol 22 (6) ◽  
pp. 731-739 ◽  
Author(s):  
S. H. Lin ◽  
S. L. Lai ◽  
H. G. Leu
Keyword(s):  
Heavy Metal ◽  
Contaminated Soil ◽  
Metal Bioavailability ◽  
Improved Method

Determination of Pb-Contamination and Remediation Boundary Based on a Specific Site

2011 ◽  
Vol 414 ◽  
pp. 27-31
Author(s):  
An Ping Liu ◽  
Xiao Nan Sun ◽  
Fang Zhao ◽  
Xiao Song Sun ◽  
Wei Ren ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Contaminated Soil ◽  
Specific Site ◽  
Contaminated Site ◽  
Repair Work ◽  
Soil Layers ◽  
Pb Contamination ◽  
Surfer Software ◽  
Reliable Basis

In the remediation of heavy metal contaminated site, determining the remediation boundary of contaminated site and amount of contaminated soil are important link of the entire work. This paper uses surfer software to draw out a picture of Pb-contamination distribution in different soil layers, determines a remediation boundary, and provides a reliable basis and brings great convenience for later repair work.

scholarly journals Effects of amendments on heavy metal immobilization and uptake by Rhizoma chuanxiong on copper and cadmium contaminated soil

2018 ◽  
Vol 5 (8) ◽  
pp. 181138 ◽  
Author(s):  
Yanluo Xie ◽  
Kemeng Xiao ◽  
Yang Sun ◽  
Yufeng Gao ◽  
Han Yang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Contaminated Soil ◽  
Metal Accumulation ◽  
Biological Activities ◽  
Improved Method ◽  
Surface Functional Groups ◽  
Rhizoma Chuanxiong ◽  
Heavy Metal Immobilization ◽  
The Fourier Transform ◽  
Cadmium Contaminated Soil

An improved method was applied for remediating cadmium and copper co-contaminated soil and reducing the metal concentration in Rhizoma chuanxiong . Pot experiments were conducted with six amendments (composed with bentonite, phosphate, humic acid, biochar, sepiolite powder, etc.). The results showed that soil pH, biological activities (soil enzymatic activities and microbial counts) and R. chuanxiong biomass were greatly improved with the addition of amendments in all treatments, especially in T3 and T6. Also, amendments effectively decreased the concentration of malondialdehyde and H 2 O 2 in R. chuanxiong . In the T3 treatment, the bio-available Cd and Cu in soil were significantly decreased by 0.53 and 0.41 mg kg −1 , respectively. Meanwhile, the amendment in T3 reduced Cd and Cu accumulation in R. chuanxiong about 45.83 and 39.37%, respectively, compared to T0. Moreover, the Fourier transform infrared spectroscopy spectra showed the surface functional groups of every amendment. To conclude, this study offers an effective and environmental method to reduce metal accumulation in R. chuanxiong on heavy metal co-contaminated soil.

SERUM TRIIODOTHYRONINE DETERMINATION BY SATURATION ANALYSIS

1973 ◽  
Vol 72 (4) ◽  
pp. 714-726 ◽  
Author(s):  
A. Burger ◽  
B. Miller ◽  
C. Sakoloff ◽  
M. B. Vallotton
Keyword(s):  
Ionic Strength ◽  
Limit Of Detection ◽  
Improved Method ◽  
Accuracy Of Measurement ◽  
Tracer Amount ◽  
The Mean ◽  
Physiological Values ◽  
Hyperthyroid Patients ◽  
Solvent Blank

ABSTRACT An improved method for the determination of serum triiodothyronine (T3) has been developed. After addition of a tracer amount of the hormone, T3 was extracted from 1 ml serum under conditions of pH and ionic strength which favoured T3 extraction (89%) over thyroxine (T4) extraction (58%). Chromatography of the extracted material on Sephadex LH-20 separated T3 completely from residual T4. The T3 eluate was dried, then re-dissolved in 0.5 ml NaOH 0.04 n. To 0.2 ml duplicate aliquots, a standard amount of TBG was added for the competitive protein analysis. After one hour incubation at 4°C, separation of bound from free T3 was achieved on small Sephadex G-25 columns. Overall recovery was 67 ± 10.8% and correction for the loss was made. The solvent blank was 37 ± 27 (sd) ng/100 ml. Accuracy of measurement of known quantities of T3 added to serum was 98.4%. The coefficient of variation within the assay was 6.2% and between the assays it was 11.4%. The limit of detection (0.1 ng) corresponded to a concentration of 25 ng/100 ml. T4 added to serum did not interfere with T3 determination until high non-physiological values were reached. The mean ± sd serum T3 in 54 euthyroid subjects was 153 ± 58 ng/100 ml and in 24 hyperthyroid patients it was 428 ±186 ng/100 ml; 4 out of the 24 hyperthyroid values were within 2 sd of the mean euthyroid group. All the values found in the euthyroid group were well above the limit of detection of the method.

An Improved Method for the Determination of Metabolic Fecal P

1957 ◽  
Vol 16 (1) ◽  
pp. 201-206 ◽  
Author(s):  
J. R. Luick ◽  
G. P. Lofgreen
Keyword(s):  
Improved Method
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