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泡沫塑料富集-电感耦合等离子体质谱法测定土壤中超痕量金铂钯 总被引:1,自引:1,他引:0
样品采用王水溶解,二氯化锡还原,泡沫塑料富集,用Re作内标,电感耦合等离子体质谱法同时测定土壤中超痕量金、铂、钯。在盐酸-二氯化锡体系中,盐酸酸度为15%,二氯化锡浓度为45 g/L,吸附时间30 min时吸附效果明显,吸附温度为25℃时吸附率相对稳定。方法检出限Au为0.21 ng/g,Pt为0.18 ng/g,Pd为0.16ng/g,方法加标回收率Au为91.3%~97.8%,Pt为92.0%~96.7%,Pd为96.0%~101.6%。该方法用于测定国家一级标准物质,线性范围宽、重现性好,结果准确可靠,样品处理简便、快速。 相似文献
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Christina Yan Wang Hazel M. Prichard Mei-Fu Zhou Peter C. Fisher 《Mineralium Deposita》2008,43(7):791-803
The Jinbaoshan Pt–Pd deposit in Yunnan, SW China, is hosted in a wehrlite body, which is a member of the Permian (∼260 Ma)
Emeishan Large Igneous Province (ELIP). The deposit is reported to contain one million tonnes of Pt–Pd ore grading 0.21% Ni
and 0.16% Cu with 3.0 g/t (Pd + Pt). Platinum-group minerals (PGM) mostly are ∼10 μm in diameter, and are commonly Te-, Sn-
and As-bearing, including moncheite (PtTe2), atokite (Pd3Sn), kotulskite (PdTe), sperrylite (PtAs2), irarsite (IrAsS), cooperite (PtS), sudburyite (PdSb), and Pt–Fe alloy. Primary rock-forming minerals are olivine and clinopyroxene,
with clinopyroxene forming anhedral poikilitic crystals surrounding olivine. Primary chromite occurs either as euhedral grains
enclosed within olivine or as an interstitial phase to the olivine. However, the intrusion has undergone extensive hydrothermal
alteration. Most olivine grains have been altered to serpentine, and interstitial clinopyroxene is often altered to actinolite/tremolite
and locally biotite. Interstitial chromite grains are either partially or totally replaced by secondary magnetite. Base-metal
sulfides (BMS), such as pentlandite and chalcopyrite, are usually interstitial to the altered olivine. PGM are located with
the BMS and are therefore also interstitial to the serpentinized olivine grains, occurring within altered interstitial clinopyroxene
and chromite, or along the edges of these minerals, which predominantly altered to actinolite/tremolite, serpentine and magnetite.
Hydrothermal fluids were responsible for the release of the platinum-group elements (PGE) from the BMS to precipitate the
PGM at low temperature during pervasive alteration. A sequence of alteration of the PGM has been recognized. Initially moncheite
and atokite have been corroded and recrystallized during the formation of actinolite/tremolite, and then, cooperite and moncheite
were altered to Pt–Fe alloy where they are in contact with serpentine. Sudburyite occurs in veins indicating late Pd mobility.
However, textural evidence shows that the PGM are still in close proximity to the BMS. They occur in PGE-rich layers located
at specific igneous horizons in the intrusion, suggesting that PGE were originally magmatic concentrations that, within a
PGE-rich horizon, crystallized with BMS late in the olivine/clinopyroxene crystallization sequence and have not been significantly
transported during serpentinization and alteration. 相似文献
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基于贵金属同2-巯基苯并噻唑(MBT)定量反应时的温度差异,在常温下采用MBT为Ag、Au和Pd的沉淀剂并藉微晶素共沉淀法富集痕量Ag、Au和Pd,使之与Pt、Rh及贱金属分离。固相富集物溶解于N,N-二甲基甲酰胺后,直接用原子吸收法测定。试验了定量共沉淀的最佳条件,方法用标样分析验证,结果吻合较好。 相似文献
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Mesozoic granitic magmatism in extensional tectonics near the Mongolian border in China and its implications for crustal growth 总被引:6,自引:0,他引:6
The Yagan area of the southernmost Sino–Mongolian border is characterized by an extensional structure where a large metamorphic core complex (Yagan–Onch Hayrhan) and voluminous granitoids are exposed. New isotopic age data indicate that the granitoids, which were previously regarded as Paleozoic in age, were emplaced in early and late Mesozoic times. The early Mesozoic granitoids have 228±7 Ma U–Pb zircon age, and consist of linear mylonitic quartz monzonites and biotite monzogranites. Their chemical compositions are similar to those of potassic granites and shoshonitic series, and show an intraplate and post-collisional environment in tectonic discrimination diagrams. Their fabrics reveal that they experienced syn-emplacement extensional deformation. All these characteristics suggest that the adjustment, thinning and extensional deformation at middle to lower crustal levels might have occurred in the early Mesozoic. The late Mesozoic granitoids have a U–Pb zircon age of 135±2 Ma, and are made up of large elliptical granitic plutons. They are high-K calc-alkaline, and were forcefully emplaced in the dome extensional setting. Both the early and late Mesozoic granitoids have Nd (t) values of −2.3 to +5, in strong contrast with the negative Nd (t) values (−11) of the Precambrian host rocks. This suggests that juvenile mantle-derived components were involved in the formation of the granitoids. The similar situation is omnipresent in Central Asia. This study demonstrates that tectonic extension, magmatism and crustal growth are closely related, and that post-collisional and intraplate magmatism was probably a significant process for continental growth in the Phanerozoic. 相似文献
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A series of geochemical anomalies of Pt and Pd were found in 1 358 recombined samples from a geochemical stream sediment survey in eastern Yunnan (云南) Province, China. Chemical optical emission spectroscopy, X-ray fluorescence analysis, and inductively coupled plasmas atomic emission spectrometry analyses of 22 elements and chemical compositions of 21 samples from coal-bearing strata from the Late Paleozoic, Mesozoic, and Cenozoic show Pt and Pd concentrated to some extent in coal rocks, with Pd/PtPd, V, Sb, U, Pb, and W are enriched in the Lower Carboniferous coal-bearing strata of the Wanshoushan (万寿山) Formation; B, Mo, As, Pt, U, W, Pb, Pd, and V are enriched in the Lower Permian coal-bearing strata of the Liangshan (梁山) Formation; Pt, Cu, Mo, Pd, As, V, and Ag are enriched in the Upper Permian coal-bearing strata of the Xuanwei (宣威) Formation; As, B, Pb, Pt, Pd, U, W, Sb, Mo, Zn, and Ag are enriched in the Upper Triassic coal-bearing strata of the Xujiahe (须家河) Formation; and Pt, As, and Pb are enriched in the lignite of the Pliocene Ciying (茨营) Formation. Combining analyses of the sedimentary environment and local volcanic activity reveal that the coal-bearing strata in the Xuanwei Formation are possibly related to the permian Emeishan(峨眉山)basalt. 相似文献
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TSC大孔螯合树脂对金铂钯的吸附特性及其在岩矿分析中的应用 总被引:2,自引:2,他引:2
本文研究了TSC大孔螯合树脂对贵金属Pt(Ⅳ)、Pd(Ⅱ)、Au(Ⅲ)和贱金属Cu(Ⅱ)、Pb(Ⅱ)、Zn(Ⅱ)、Fe(Ⅲ)、Al(Ⅲ)等的吸附特性。测定了树脂在不同酸度下对Au(Ⅲ)、Pt(Ⅳ)、Pd(Ⅱ)的饱和吸附容量。研究结果表明,该树脂可从稀HCl、稀王水溶液中定量吸附Au(Ⅲ)、Pt(Ⅳ)、Pd(Ⅱ),而贱金属离子则不被吸附。吸附在树脂上的Au、Pt、Pd可被5%硫脲溶液洗脱,洗脱液中的Au、Pt、Pd可分别用火焰和无火焰原子吸收法测定。标准加入回收率为97—107%。通过对MGI-Au-07,MCM-02标准样品和其它样品的测定,说明应用本法可获得满意的结果。 相似文献