[Characterization of Metal Pollution of Regional Atmospheric PM and Its Sources Based on the PMF Model].

As important components of PM, metal elements are extremely harmful to people and also have source specificity. Understanding the characteristics of PM metal pollution in the two different types of cities can help adjust the layout of regional industrial structure and improve the environment. PM samples during haze/non-haze periods were collected in Chengdu City and Renshou County.

[Comparative Analysis of Pollution Characteristics of Carbonaceous Aerosol Components in the Atmosphere Between Urban and Suburban Areas].

To compare the pollution characteristics of carbonaceous aerosol components in the atmosphere between urban and suburban areas, Chengdu City and Renshou County were selected as study areas from which 88 samples of PM during haze and non-haze periods were collected and analyzed. Quantification of mass concentrations of PM, carbonaceous aerosol components[organic carbon (OC), elemental carbon (EC), and secondary organic carbon (SOC)], along with correlation analysis of OC and EC, and principal component analysis (PCA) of carbon components were carried out. The results show that pollutant concentrations during the haze period were higher than those during the non-haze period.

Association between serum leptin levels and breast cancer risk: An updated systematic review and meta-analysis.

Background: Many studies have indicated that leptin is correlated with breast cancer occurrence and tumor behavior. However, this issue remains controversial. Therefore, we conducted an updated meta-analysis to investigate the role of leptin in breast cancer.

[A new method for the preparation of potassium ferrate and spectroscopic characterization].

Calcium hypochlorite was used as the raw material for preparation of the high purity potassium ferrate. The study includes the effects of reaction temperature, recrystallization temperature, reaction time, Ca(ClO)2 dosage, and the amount of calcium hypochlorite on the yield. It was determined that when the reaction temperature was 25 degrees C, recrystallization temperature 0 degree C and reaction time 40 min, the yield was more than 75%.

[Removal of arsenic (II) by ferrate oxidation-coagulation from drinking water].

Ferrate is multi-function agent in water treatment and shows great oxidizing ability and excellent purifying effect. This experiment evaluated the performance of ferrate for arsenic removal. Experimental results show that the best rate of ferrate and arsenic (III) is 15:1, the efficiency of As removal can be achieved 98%, and the residual concentration of As3 + is < 0.