新型无机重液LST在牙形石分离中的使用  

LST:A New Inorganic Heavy Liquid Used in Conodont Separation

作　　者：苑金玲 江海水[1,2] 王达成[1,2] 

机构地区：[1]中国地质大学生物地质与环境地质国家重点实验室,武汉430074 [2]中国地质大学地球科学学院,武汉430074

出　　处：《地质科技情报》2015年第5期225-230,共6页Geological Science and Technology Information

基　　金：国家自然科学基金项目(41172024;41272044)

摘　　要：LST（solution of lithium heteropolytungstates in water）重液是一种安全无毒、黏性小、密度高、稳定性强、回收率高,可用于分离提取微体化石及矿物的新型无机重液。在将LST重液用于牙形石的分离提取实验中,对LST重液的配制、回收再利用以及分离提取牙形石的操做流程做了详细论述。在实际操作中,建议对于原岩为灰岩的样品,重液密度配制为2.80~2.81g/mL为宜,对于原岩为白云岩的样品,重液密度配制为2.82~2.83g/mL为宜。LST重液与三溴甲烷、四溴乙烷、二碘甲烷、杜列液和多钨酸钠重液相比,在分离提取牙形石方面具有明显优势。建议在矿物和微体化石等的分离提取实际应用中,使用LST重液取代传统的有机重液以及无机重液。A new type of inorganic heavy liquid, LST （solution of lithium heteropolytungstates in water）, used in mierofossils or mineral grains separation, is introduced in this paper, for it has the advantages of non-toxic, lower viscosity, high density, high resistance to decomposition and high recycle rate. Based on the rich experiences in conodont separation, this paper describes in detail the procedure of the preparation, using and recycling of the LST heavy liquid. For the most efficient separation, a 2.80--2.81 g/mL density of heavy liquid is recommended for limestone samples, while a 2.82- 2.83 g/mL density of heavy liquid is recommended for dolomite samples. Compared with the traditional heavy liquids, e.g. bromoform, tetra- bromoethane, diiodomethane, thoulet solution and sodium polytungstate, LST heavy liquid has distinct superiority. We strongly suggest that the traditional organic and inorganic heavy liquids should be replaced by LST heavy liquid in separating microfossils and minerals.

关 键 词：牙形石 重液分离 LST重液 

分 类 号：Q93-3[生物学—微生物学]