Search

The Taiyuan formation limestone water in the Huaibei coalfield is not only the water source for coal mining, but also the water source for industry and agriculture in mining areas. Its hydrogeochemical characteristics and water quality are generally concerning. In this paper, conventional ion tests were carried out on the Taiyuan formation limestone water of 16 coal mines in the Sunan and Linhuan mining areas of the Huaibei coalfield. Piper trigram, Gibbs diagram and an ion scale coefficient map were used to analyze the hydrogeochemical characteristics of the Taiyuan formation limestone water. The water quality was evaluated in a fuzzy comprehensive manner. The results show that the main cation and anion contents in the Taiyuan formation limestone water were Na + > Mg 2+ > Ca 2+ > K + , SO 4 2 - > HCO 3 - > Cl - . There were differences in the hydrogeochemical types of the Taiyuan formation limestone water in the two mining areas; HCO 3 -Na type water was dominant in the Sunan mining area and SO 4 ·Cl-Na type water was dominant in the Linhuan mining area. The chemical composition of the Taiyuan formation limestone water is mainly affected by the weathering of the rock and is related to the dissolution of the evaporated salt and the weathering of the silicate. The fuzzy comprehensive evaluation results show that the V-type water accounts for a large proportion of the Taiyuan formation limestone water in the study area and the water quality is poor. This study provides a basis for the development and utilization of the Taiyuan formation limestone water and water environmental protection in the future.

In this study, profile Soil (0–10, 10–30, 30–60 cm) samples were collected and the content, horizontal and vertical distributions of Cr, Mn, Co, Ni, Cu, Zn, As, Cd, and Pb were analyzed. The results indicated that high concentrations of Cu-Zn appeared in wasteland B, while Co-Mn appeared in farmland. As the depth increased, Cr, Zn, and Cd contents in wasteland increased, Cu, As, Cr, and Pb contents in farmland also increased. The average concentrations of Cu, As, Zn, and Cd in wasteland and Cu, As, Mn, and Ni in farmland both exceeded their corresponding background values. Besides, the average concentrations of Cr, Mn, Co, Ni, Cu, and As of wasteland and farmland were much higher than the world soil background values except for Cd-Pb. The results of the assessment indicated that the contents of heavy metals in three lands have reached a slight pollution level. The results of Pearson correlation analysis and positive matrix factorization (PMF) showed that Cd was closely related to agricultural activities, As-Cr were mainly from mining activities, followed by domestic pollution. At the same time, Ni primarily came from domestic pollution, Cu, Zn, and Pb were related to transportation, Mn-Co were associated with nature factor. [ABSTRACT FROM AUTHOR]

In this paper, the 36 topsoil (0–10 cm) samples were collected and the contents of Cr, Mn, Co, Ni, Cu, Zn, As, Cd and Pb were analyzed. The results indicated that the contents of Cu and As in all samples exceeded the soil background values of Anhui province, while the Co and Pb contents were lower than the background values. Geo-statistics and positive matrix factorization were applied to identify the sources of soil heavy metals, which were nature factor (15.7%), industrial activities (21.2%), coal mine (50.9%) and traffic emission (12.2%), respectively. The calculation results of health risk model based on positive matrix factorization model showed that coal mine activities accounted for the largest proportion of total source contribution, followed by industrial activities. In addition, compared with adults, the trend of health risk of children from four sources in three lands were same as adults, but their health risk was higher than adults. [ABSTRACT FROM AUTHOR]