Effect of biochars on adsorption of Cu(II), Pb(II) and Cd(II) by three variable charge soils from southern China.

The purpose of this study is to compare the relative contribution of different mechanisms to the enhanced adsorption of Cu(II), Pb(II) and Cd(II) by variable charge soils due to incorporation of biochars derived from crop straws. The biochars were prepared from the straws of canola and peanut using an oxygen-limited pyrolysis method at 350 °C. The effect of biochars on adsorption and desorption of Cu(II), Pb(II) and Cd(II) by and from three variable charge soils from southern China was investigated with batch experiments.

[Adsorption of methylene blue from water by the biochars generated from crop residues].

Biochars were prepared from straws of rice, peanut and soybean and rice hull using a low temperature pyrolysis method and adsorption of methylene blue by these biochars were investigated with batch and leaching experiments. Results indicated that biochars have high adsorption capacity for methylene blue and followed the order: rice straw char > soybean straw char > peanut straw char > rice hull char. This order is generally consistent with the amount of negative charge and specific surface area of these biochars.

Adsorption of methyl violet from aqueous solutions by the biochars derived from crop residues.

The adsorption of methyl violet by the biochars from crop residues was investigated with batch and leaching experiments--adsorption capacity varied with their feedstock in the following order: canola straw char>peanut straw char>soybean straw char>rice hull char. This order was generally consistent with the amount of negative charge of the biochars. Zeta potentials and Fourier transform infrared photoacoustic spectroscopy, combined with adsorption isotherms and effect of ionic strength, indicated that adsorption of methyl violet on biochars involved electrostatic attraction, specific interaction between the dye and carboxylate and phenolic hydroxyl groups on the biochars, and surface precipitation.

Effect of soil acidification induced by a tea plantation on chemical and mineralogical properties of Alfisols in eastern China.

The effect of a tea plantation on soil basic properties, chemical and mineralogical compositions, and magnetic properties of Alfisols from eastern China was studied. Under the tea plantation, acidification took place within a soil depth of 70 cm, with the maximum difference in pH in the upper 17 cm (ΔpH = 2.80).

[Study on the relationship between estrogen receptor beta and etiology of human endometrial polyps].

Objective: To investigate the relationships between the expression of estrogen receptor beta (ERbeta) and etiology of human endometrial polyps (EP).

Methods: Thirty-six females with infertility and 36 females with intrauterine contraceptive device (IUD, aged from 23 years to 33 years, average 28 years) were enrolled in the study. Blood samples were taken before hysteroscopy for analysis of the level of estradiol in serum.