摘要
用1.5 mol/l HOAc,1.5 mol/l HOAc-1.0 mol/l NH_2OH·HCl(v/v1:1),6 mol/l HCl 和 HF-HCl 作沥取剂,选择沥取锰结核的不同地球化学相中的元素,并用等离子体原子发射光谱法分析了各相的化学组成,用放化技术测量了各相的铀系核素。结果表明,碳酸盐、吸附态元素及大部分U同位素存在于HOAc 相,Fe-Mn 氧化物矿物,Cu,Co,Ni,V 等元素及^(226)Ra,^(210)Pb存在于 NH_2OH·HCl 相,HCl 相由富Ti 和Th 的矿物及Fe 的稳定矿物(如针铁矿)组成,而 HF-HCl 相则是富 Si 和Al的铝硅酸盐,包括粘土矿物和碎屑矿物。
A new method has been developed to leach sequentially and selectively the elements in different geochemieal phases of manganese nodules by using 1.5 mol/l HOAc, 1.5 mol/l HOAc-1.0 mol/l NH2OH·HCl,6 mol/1 HC1, and HP-HC1 as the leaching agents and the chemical compositions of each phase has Leen analysed by ICP-AES and the activities of U-series nuclides by radiochemical technique. It is shown that Ca-rich carbonate such as calicite and the absorbed forms of elements exist in the HOAc phase; the NH2OH·HCl phase consists of the minerals of Mn-Fe oxides, which incorporate Cu, Co, Ni, V and so on into nodules; the HCl phase is composed of Ti-and Th-rich minerals and the HF-HC1 phase is Si- and A1- rich alumuaosilicates, including clay minerals and detritus minerals. The results are also indicative of diffe-rent geochemical behaviors of U-series nuclides in manganes nodules, such as U isotopes in the HOAc and NH2OH·HC1 phases, 226Ra aad 210Pb in the NH2OH·HC1 phase and Th isotopes in the HCl phase.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
1989年第3期297-300,共4页
Journal of Xiamen University：Natural Science
关键词
锰结核
选择沥取法
放射性核素
Manganese nodules, Radio-nuclides, Trace metals, Selectively-leaching
