The results of REE leached by some organic acids with various concentrations and water/rock ratios for different durations from a mixed sample of the weathering crust of a granite in Gonghe, Guangdong, China, showed t...The results of REE leached by some organic acids with various concentrations and water/rock ratios for different durations from a mixed sample of the weathering crust of a granite in Gonghe, Guangdong, China, showed that: 1) the contents of REE leached increase with increasing concentrations of the organic acids; 2) the contents of REE leached by 0.01 mol/L organic acids increase with increasing water/rock ratio; 3) the interaction between the organic acids and the samples enhances the pH value of the medium and the contents of REE leached tend to increase with decreasing pH value; and 4) compared with those leached by ammonia sulfate, the REE leached by the organic acids are characterized by a weaker negative Ce anomaly, a stronger negative Eu anomaly, and lower (La/Sm)\-N and (Gd/Yb)\-N ratios, indicating that the organic acids have made contributions to the fractionation of REE in the weathering crust.展开更多
基金ThisworkwasgrantedbytheNaturalScienceFoundationofGuangdongProvince China (GrantNos.96 0 0 42 990 2 32 )
文摘The results of REE leached by some organic acids with various concentrations and water/rock ratios for different durations from a mixed sample of the weathering crust of a granite in Gonghe, Guangdong, China, showed that: 1) the contents of REE leached increase with increasing concentrations of the organic acids; 2) the contents of REE leached by 0.01 mol/L organic acids increase with increasing water/rock ratio; 3) the interaction between the organic acids and the samples enhances the pH value of the medium and the contents of REE leached tend to increase with decreasing pH value; and 4) compared with those leached by ammonia sulfate, the REE leached by the organic acids are characterized by a weaker negative Ce anomaly, a stronger negative Eu anomaly, and lower (La/Sm)\-N and (Gd/Yb)\-N ratios, indicating that the organic acids have made contributions to the fractionation of REE in the weathering crust.
