Partition coefficients of copper in solid-dissolution phases with different soil properties

• Main Authors: Tzeng, Ying-Lie, 曾英烈
• Other Authors: Yu, Wu-Chou
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/34293363326356242877

碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 104 === Aqua regia extraction is one of the methods to determine heavy metals content in soil. Analytical result of heavy metals in soil using aqua regia extraction only defines total content but is not able to represent their mobility or impact on health of human and plants. Solid-liquid partition coefficient is an ideal parameter to assess mobility and bioavailability of heavy metals in soil. 128 soil samples of agricultural land from three regions, including Taoyuan County, Changhua County and Tainan City, throughout Taiwan were chosen for analysis of physical and chemical properties in soil. Soil samples of each region are extracted by 0.1 N HCl, 0.005 M DTPA and 0.05 M EDTA, concentration of copper in extract is being analyzed. Statistical method is used to assess correlation between solid-liquid partition coefficient and physical or chemical properties of soil and extraction. Results show low correlation between KD_HCl and clay or organic carbon(OC) content of soil on mobility of copper with R2=0.377(p < 0.01). Medium Correlation is shown between KD_DTPA and clay or OC soil on mobility of copper with R2=0.434(p < 0.01). Medium correlation is shown between KD_EDTA and pH, clay or OC content of soil on mobility of copper with R2=0.455(p < 0.01). Mobility of copper increases with increasing value of Kd, resulting higher risk to human health or environment.