Partitioning of Metals between Petroleum Productsand WaterPartitioning of Metals between Petroleum Productsand WaterPartitioning of Metals between Petroleum Productsand WaterPartitioning of Metals between Petroleum Productsand WaterPartitionin

• Main Authors: WAN-Chi TU, 涂琬琪
• Other Authors: Colin S. Chen
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/19174827862131714027

碩士 === 國立高雄師範大學 === 生物科學研究所 === 94 === Abstract Groundwater is of vital significance in Taiwan due to its current and expected increase in use as a water supply for domestic, industrial and agricultural use. Groundwater pollution, especially pollution caused by inadvertent leakage from underground petroleum storage tanks, has recently received increased attention. The petroleum products that leaked into the groundwater may also contain a number of additives with heavy metal composition. As the petroleum products diffuse into the subsurface environment, the heavy metals contamination the soil and groundwater. The study was made of two parts both studying heavy metals in groundwater. The first part focused on heavy metal analysis in groundwater from the Kaohsiung’s Hau Jing region. Within Hau Jing, groundwater samples were taken from two different sites: one in the polluted Wan Xing area, one in Hau Jing’s community area. Groundwater samples were then subjected to nitrite acid digestion to extract heavy metals. After digestion, heavy metal concentration was determined by atomic absorption Spectroscopy (AA). The second part of the study examined the heavy metal concentration partitioned into water after the water was exposed to oils. Four different types of petroleum products including unleaded gasoline, diesel fuel, motor oil and used motor oil, were equilibrated with deionized water in the partition experiment. Heavy metal concentration in water was determined. In addition, treatments with different oil-water ratios and different pH levels were performed to examine their impacts on partitioning behavior. In the first part of the study, heavy metal concentrations, particularly iron and manganese concentrations, in Wan Xing’s groundwater were found to be higher than governmental regulation levels. The second part of the study, three heavy metals consistently partitioned into water: iron, nickel and zinc. Among the three metals, zinc made up of the highest concentration when partitioned from motor oil, which also had the highest average concentration of metals. From results in the study, several conclusions were made. From the first part of the study, the higher than acceptable concentration of heavy metals found in Wan Xing is potentially caused by inadvertent petroleum leaks from pipelines and storage tanks used for transporting petroleum to and from the oil refineries. Furthermore, Wan Xing was a former industrial waste disposal area, thus the metals could have originated from residual wastes. From the second part of the study, the different oil-water ratios and different pH levels affected partitioning behavior of heavy metals from oils into water. Furthermore, although all petroleum products contain heavy metal constitnents, are heavy metal pollutants, motor oil is the most potent groundwater pollutant because it causes not only the most zinc contamination, but also significant heavy metal contamination. Abstract Groundwater is of vital significance in Taiwan due to its current and expected increase in use as a water supply for domestic, industrial and agricultural use. Groundwater pollution, especially pollution caused by inadvertent leakage from underground petroleum storage tanks, has recently received increased attention. The petroleum products that leaked into the groundwater may also contain a number of additives with heavy metal composition. As the petroleum products diffuse into the subsurface environment, the heavy metals contamination the soil and groundwater. The study was made of two parts both studying heavy metals in groundwater. The first part focused on heavy metal analysis in groundwater from the Kaohsiung’s Hau Jing region. Within Hau Jing, groundwater samples were taken from two different sites: one in the polluted Wan Xing area, one in Hau Jing’s community area. Groundwater samples were then subjected to nitrite acid digestion to extract heavy metals. After digestion, heavy metal concentration was determined by atomic absorption Spectroscopy (AA). The second part of the study examined the heavy metal concentration partitioned into water after the water was exposed to oils. Four different types of petroleum products including unleaded gasoline, diesel fuel, motor oil and used motor oil, were equilibrated with deionized water in the partition experiment. Heavy metal concentration in water was determined. In addition, treatments with different oil-water ratios and different pH levels were performed to examine their impacts on partitioning behavior. In the first part of the study, heavy metal concentrations, particularly iron and manganese concentrations, in Wan Xing’s groundwater were found to be higher than governmental regulation levels. The second part of the study, three heavy metals consistently partitioned into water: iron, nickel and zinc. Among the three metals, zinc made up of the highest concentration when partitioned from motor oil, which also had the highest average concentration of metals. From results in the study, several conclusions were made. From the first part of the study, the higher than acceptable concentration of heavy metals found in Wan Xing is potentially caused by inadvertent petroleum leaks from pipelines and storage tanks used for transporting petroleum to and from the oil refineries. Furthermore, Wan Xing was a former industrial waste disposal area, thus the metals could have originated from residual wastes. From the second part of the study, the different oil-water ratios and different pH levels affected partitioning behavior of heavy metals from oils into water. Furthermore, although all petroleum products contain heavy metal constitnents, are heavy metal pollutants, motor oil is the most potent groundwater pollutant because it causes not only the most zinc contamination, but also significant heavy metal contamination.