土壤施用重金屬鎘、銅容許量之推估以LEACHM模式模擬鎘、銅於土壤之移動

• Main Author: 徐秀鳳
• Other Authors: 林正芳
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/91593591768803238269

碩士 === 國立臺灣大學 === 環境工程與科學系 === 81 === With four types of soil ─ LungKang, Erhshui, Annei and Shou-feng-tsun soil, batch adsorption experiment and O.1 N HCl desorption experiment were adopted in this study to explore the relation among augmented, adsorpted and desorpted amount of heavy metals ─ Cadmium and Copper. TKe results are shown that the relation between augmented amount and a dsorpted amount can be demonstrated linealy, so as that of adsorpted amount and desorpted amount except Shou-feng-tsun soil. A suggested values (1.0μg/g.soil for Cd; 50 μg/g.soil for Cu) of O.I N HCI desorpted amount for soil were used to evalute the augmented loading capacity in soil for Cadmium and Copper; the evaluated values are 1.8 Kg/ha for Cadmium and 130 Kg/ha for Copper. The relationship of adsorpted and desorpted percentage of heavy metals with the soil properties was analyzed with the stepwise regression method. The results are shown as following: 1.Adsorpted percentage of Cadmium is the function of pH-value of adsorption; that of Copper is the function of pH-value of adsorption, percentage of organic matters and specific surface (BET). 2.Desorpted percentage of Cadmium is the function of pH-value of adsorption, CEC and specific surface; that of Copper is the function of percentage of organic matters and specific surface (BET). Besides that, the results of column test and simulation of LEACHM indicate that the partition coefficient of Cadmium are 0.171 l/g in Shou-feng-tsun soil and 0.065 l/g in LungKang soil. Simulation of the mobility of Cadmium in LungKang soil fits the results of column test well, but that in Shou-feng- tsun soil doesn''t. The augmented loading capacity of soil for Cadmium is 1.8 Kg/ha. With suggested values 5.0 cm water head/time for irrigated condition and 45 times/year for 10 years irrigation, the maximum concentration of irrigated water is 8.0 μg/l in Shou-feng-tsun soil; the results of simulation with LEACHM are shown that the amount of Cadmium in each level of 1O-cm-depth soil are O.1∼3.8 μg Cd/g.soil. The average is 1.46 ng Cd/g.soil which is higher than the loading capacity (0.52μg Cd/g.soil) of Cadmium in Shou-feng -tsun soil.