去除有机质前后海底沉积物对稀土元素吸附能力的变化研究

Capacity change of marine sediments with and without organic matter for absorption of rare earth elements

为更好地了解有机质对沉积物吸附稀土元素能力的影响,对珠江口和南海沉积物在去除有机质之前和之后进行了稀土元素吸附实验研究。结果表明,同一种沉积物在去除有机质前后对稀土元素的吸附呈现基本相同的规律,只是吸附量有所不同。沉积物在去除有机质之后对稀土离子的吸附能力比去除有机质之前大大降低;沉积物对各种稀土元素吸附量降低的百分比为:珠江口沉积物对Yb的吸附量减少了47.24%,对La的吸附量减少了75.50%,对其它元素的吸附量减少介于47.24%—75.50%之间;南海沉积物对Sm的吸附量减少了35.93%,对Ho的吸附量减少了45.41%,对其它元素的吸附量减少介于35.93%—45.41%之间。

To better understand the effect of organic matter in sediments on adsorption of rare earth elements （REEs）, REE adsorption experiments were conducted for the sediments in the Zhujiang River estuary and the South China Sea before and after removal of organic matter from them. The results indicate that the same sediment presents a similar tendency of adsorption capacity before and after removal of organic matter, but the quantity of adsorption is different. The adsorption capacity of the sediments with organic matter is more stronger than that of the sediments without organic matter. After removal of organic matter, the adsorption capacity reduces by 47. 24% for Yb, 75.50% for La, and between 47.24% and 75.50% for other REEs for the sediments in the Zhujiang River estuary; and 35.93% forSm, 45.41% for Ho, and between 35. 93% and 45.41% for other REEs for the sediments in the South China Sea.