Improvement of the Successive Selective Dissolution Procedure for the Separation of Birnessite, Lithiophorite, and Goethite in Soil Manganese Nodules

IF 2.4 3区农林科学 Q2 SOIL SCIENCE

Soil Science Society of America Journal Pub Date : 2003-05-01 DOI:10.2136/SSSAJ2003.0837

Y. Tokashiki, T. Hentona, M. Shimo, L. P. V. Arachchi

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引用次数: 30

Abstract

A successive selective dissolution procedure was improved to distinguish two Mn oxide minerals namely, birnessite (Bs) and lithiophorite (Lp) from Fe oxide minerals in soil Mn nodules. Soil Mn nodules collected from Typic Hapludalfs in Okinawa Island, Japan, were dissolved using successive NaOH, hydroxylamine hydrochloride (HAHC), and dithionite-citrate-bicarbonate (DCB) reagents at various temperatures. A test sample was prepared by mixing synthetic Bs, Lp (USNM#8811), natural gibbsite (Gb) and goethite (Ge), and soil clay containing kaolinite, illite, and vermiculite-chlorite intergrade mineral and used as a comparative standard. The NaOH treatment was able to dissolve kaolinite and Gb, concentrated the Bs, Lp, and Ge in the comparative sample. The HAHC treatment at 25°C effectively dissolved Bs but Lp and Ge remained undissolved. A subsequent extraction with HAHC at 60°C dissolved Lp without disturbing Ge. Finally, the DCB treatment was able to dissolve Ge. Thus, extraction with HAHC at 25 and 60°C were useful in distinguishing Bs and Lp respectively from Fe oxides minerals. The proposed method can also be applied to distinguish Mn, Fe, and Al oxide minerals in Fe-Mn nodules of natural soil.

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土壤锰结核中钡、石、针铁矿连续选择性溶解分离方法的改进

改进了一种连续选择性溶解方法，从土壤锰结核中的氧化铁矿物中区分出两种氧化锰矿物，即birnite (Bs)和lithoporite (Lp)。采用NaOH、盐酸羟胺(HAHC)和二硫代酸-柠檬酸盐-碳酸氢盐(DCB)试剂在不同温度下对日本冲绳岛Typic Hapludalfs土壤锰结核进行溶解。将合成的Bs、Lp (USNM#8811)、天然三水铝石(Gb)和针铁矿(Ge)与含高岭石、伊立石和蛭石-绿泥石混品位矿物的土壤粘土混合配制成试样，作为比较标准。NaOH处理能溶解高岭石和Gb，使比较样品中的Bs、Lp和Ge富集。25℃下HAHC处理能有效溶解Bs，但Lp和Ge仍未溶解。随后在60°C下用HAHC萃取，在不干扰Ge的情况下溶解Lp。最后，DCB处理能够溶解Ge。因此，在25°C和60°C条件下，用HAHC萃取可以分别从Fe氧化物矿物中分离出b和Lp。该方法还可用于天然土壤铁锰结核中锰、铁、铝氧化物矿物的鉴别。

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来源期刊

Soil Science Society of America Journal 农林科学-土壤科学

CiteScore

5.40

自引率

3.40%

发文量

130

审稿时长

3.6 months

期刊介绍： SSSA Journal publishes content on soil physics; hydrology; soil chemistry; soil biology; soil biochemistry; soil fertility; plant nutrition; pedology; soil and water conservation and management; forest, range, and wildland soils; soil and plant analysis; soil mineralogy, wetland soils. The audience is researchers, students, soil scientists, hydrologists, pedologist, geologists, agronomists, arborists, ecologists, engineers, certified practitioners, soil microbiologists, and environmentalists. The journal publishes original research, issue papers, reviews, notes, comments and letters to the editor, and book reviews. Invitational papers may be published in the journal if accepted by the editorial board.