Notice of Retraction: Characteristic and Speciation of pH in Shallow Groundwater in the Pearl River Delta

Zhang, Yuxi; Sun, Jichao; Liu, Jianwen; Huang, Guanxing; Chen, Xi; Cui, Haiwei; Wang, Jincui; Zhang, Yuanjing; Jing, Jihong; Xiang, Xiaoping

doi:10.1109/icbbe.2011.5780708

Cited by 3 publications

(3 citation statements)

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“…To study the dynamic compressive and tensile strength of coal samples, cylindrical samples and Brazilian disc samples were made, respectively. In order to simulate the actual situation of natural water solution, referring to Zhang et al [24], the lower limit of the pH value under acidic condition is 4, and the upper limit of the pH value under alkaline condition is 9.…”

Section: Specimen Preparationmentioning

confidence: 99%

Effect of Acid and Alkaline Environment on Dynamic Strength and Porosity Characteristics of Bursting Liability Coal

Fan²,

Liu

et al. 2021

Shock and Vibration

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In order to investigate the influence of acid and alkaline environment on dynamic strength and porosity characteristics of bursting liability coal, scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis were used to compare the microstructures of coal with different bursting liabilities. A split Hopkinson bar (SHPB) was used to test the dynamic compressive strength and tensile strength of coal samples with different bursting liabilities. The results show that the surface micromorphology and structure characteristics of coal samples with different bursting liabilities are representatives, which can be used as an auxiliary basis to determine the bursting liability of coal seam. The microstructure of coal with strong bursting liability is characterized by mylonitic, fragmentary, and brecciated structure, and the microstructure is diverse and complex. However, the microstructure of no bursting liability coal is single and uniform. Coal with strong bursting liability shows tensile, compressive, and shear cracks produced by tectonic action, and the distribution of cracks is complicated. The development of fissures is greatly affected by the degree of coal metamorphism, organic components, minerals, and other factors. Under acidic and alkaline environments, the decrease amplitude of tensile strength of coal is obviously larger than that in neutral solution, which indicates that under the action of acid-based solution soaking, the easily soluble minerals in coal react with hydrogen ions and hydroxyl ions in solution obviously. Porosity increment in acidic environment is much larger than that in alkaline and neutral environments. The strong bursting liability coal is more sensitive to acidic environment, while the no bursting liability coal is more sensitive to alkaline environment.

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Section: Specimen Preparationmentioning

confidence: 99%

Effect of Acid and Alkaline Environment on Dynamic Strength and Porosity Characteristics of Bursting Liability Coal

Fan²,

Liu

et al. 2021

Shock and Vibration

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show abstract

“…In order to study the dynamic compressive and tensile strength of the coal samples, cylindrical specimens and Brazilian disc specimens were prepared, respectively. To simulate the actual conditions of natural aqueous solutions, the lower limit of pH under acidic conditions was 2 with reference to Zhang et al [23], and three types of water retention solutions were used: distilled water with pH � 7, acidic solution with pH � 4, and acidic solution with pH � 2. e mineral composition of the coal samples was determined, and then the coal samples were immersed in different pH values (pH � 7, 4, and 2) for 5, 10, 15, 20, and 25 dry and wet cycles. After the cycles, dynamic compression and tensile tests were performed on saturated samples and dry samples dried for 24 hours.…”

Section: Specimen Preparationmentioning

confidence: 99%

Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of Coal

Gong

Wen

et al. 2021

Shock and Vibration

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Coal pillars left in coal mines are often subjected to long-term submersion by groundwater and chemical solutions and are susceptible to deterioration and even destabilization damage under dynamic load disturbance. In order to investigate the effects of acidic environment on dynamic mechanical properties and porosity evolution characteristics of coal, a split Hopkinson bar (SHPB) was used to test the dynamic compressive strength and tensile strength of coal samples under different acid environment. The results showed that the sample density gradually decreased with the increase of the number of wet and dry cycles, but the decrease was significantly related to the pH value. Longitudinal wave velocity of coal sample decreases gradually with the increase of drying and wetting cycles, and the decreasing speed is first fast and then slow. The stronger the acidity of the solution, the more times the dry-wet cycle, and the higher the water absorption of the sample. In the early stage of dry-wet cycle, the coal is significantly affected, and the average deterioration degree is large. After that, the influence of cyclic action is reduced, and the average degradation degree is small. Porosity of coal increases continuously under the action of dry-wet cycle. The stronger the acidity, the greater the change in initial porosity. In the 20th cycle, the porosity of the acidic environment increases significantly at once and then decreases continuously.

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“…The lake covers 31.9 km 2 . It is 12.7 km long from north to south [2], 2.5 km wide from east to west and the average depth is 22 m. The water in the lake is rated GradeⅡwhich makes it an important source of drinking water for hundreds of thousands of people in Kunming Yiliang County until the Singapore's foreign investment built two 18-hole standard golf courses on the steep terrain nearby the Yangzonghai Lake in 1996. It was made up of 2 parts: the mountain scenic and the lake scenic.…”

Section: Introductionmentioning

confidence: 99%

Environmental Pollution Analysis and Countermeasures of the Golf Course in Yangzonghai Area

Li¹,

Yang²,

Yu³

et al. 2013

AMR

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The golf course industry has become increasingly aware of potential problems related to pesticide and fertilizer movement from soil into surface water and groundwater . The objective of this study was to monitor and analysis the pollution level and scope, varying pattern, diffusion characteristics and the impact on the lake which are influenced by the Spring City Golf Course located in the catchment area of Yangzonghai Lake. It produced data on the quality of the surface water bodies, groundwater and soil environment including nitrogen, phosphorus, pesticides and heavy metal , and proposed some control measures in the last part.

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Notice of Retraction: Characteristic and Speciation of pH in Shallow Groundwater in the Pearl River Delta

Cited by 3 publications

References 0 publications

Effect of Acid and Alkaline Environment on Dynamic Strength and Porosity Characteristics of Bursting Liability Coal

Effect of Acid and Alkaline Environment on Dynamic Strength and Porosity Characteristics of Bursting Liability Coal

Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of Coal

Environmental Pollution Analysis and Countermeasures of the Golf Course in Yangzonghai Area

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