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磷矿石中氧化锰含量的测定分光光度法和容量法的比较
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作者 曹蔚 冯洪军 梁小凤 《广东化工》 CAS 2024年第19期192-194,共3页
在磷矿石中测定氧化锰含量时,分光光度法和容量法各有优缺点。分光光度法基于吸收光谱特性测定浓度,具有高准确性和良好重复性,但操作较为复杂,对仪器和技术要求高;适用于低浓度锰样品,但需解决其他物质干扰。而容量法通过滴定确定浓度... 在磷矿石中测定氧化锰含量时,分光光度法和容量法各有优缺点。分光光度法基于吸收光谱特性测定浓度,具有高准确性和良好重复性,但操作较为复杂,对仪器和技术要求高;适用于低浓度锰样品,但需解决其他物质干扰。而容量法通过滴定确定浓度,操作简便,适用于实验室条件,尤其是碘量法在控制下准确度高,适用范围广,能有效排除一些干扰物如三价铁离子。其重复性依赖于滴定精度。因此,选择方法时应考虑样品特性、准确性要求和操作便利性,并针对具体情况进行方法验证和优化,以确保结果的可靠性。 展开更多
关键词 磷矿石 氧化锰含量 分光光度法 容量法 测定 优缺点 比较 方法选择
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Parameters Affecting the Color Mechanism of Manganese Containing Colored Glasses
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作者 Arca lyiel Duygu Oktem Fehiman Akmaz 《Journal of Chemistry and Chemical Engineering》 2014年第9期849-858,共10页
Color is an important tool for glass industry to let the product gain additional aesthetic and functional properties forced by the market demands. In this context, it is necessary to understand the color forming mecha... Color is an important tool for glass industry to let the product gain additional aesthetic and functional properties forced by the market demands. In this context, it is necessary to understand the color forming mechanism better in order to get target color and improve the yield. A detailed experimental study to investigate the relationship between the manganese content on color formation and the redox condition was carried out. All experiments were carried out at different level of iron and manganese oxides. Color parameters (dominant wavelength, brightness (%), purity (%) and L-a-b values) were examined for large interval of batch redoxes. In this paper, the results of above mentioned experimental studies were discussed together. 展开更多
关键词 Colored glass manganese oxide iron oxide batch redox.
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Resolving the hydrothermal signature by sequential leaching studies of sediments from the middle of the Okinawa Trough 被引量:1
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作者 YU ZengHui GAO YuHua +1 位作者 ZHAI ShiKui LIU FeiFei 《Science China Earth Sciences》 SCIE EI CAS 2012年第4期665-674,共10页
A sediment core H9 collected from the middle of the Okinawa Trough was studied by sequential leaching to indentify the hy- drothermal component from the various other components such as detrital, biogenic, and so on. ... A sediment core H9 collected from the middle of the Okinawa Trough was studied by sequential leaching to indentify the hy- drothermal component from the various other components such as detrital, biogenic, and so on. The elements were partitioned into five fractions: exchangeable, bound to carbonates, bound to iron and manganese oxides, bound to organic matter, and re- sidual. The contents of elements A1, Ti, K, Fe, Mn, Pb, Co, Cu, Ni, and V in each fraction were determined and their percent- ages were calculated. Residual fraction is a dominant speciation for most studied elements except for Mn and Pb in the core sediments. For the elements A1, Ti, and K, residual fraction accounts for more than 95% of the total metal concentration. The concentrations of all studied elements in the exchangeable fraction, carbonate fraction, and organic fraction are relatively low. The metal levels in the iron and manganese oxide fraction are relatively high and this fraction represents another prevalent speciation. Also in this fraction, the metal concentrations and percentages are higher in the core section above 80 cm than those below 80 cm. Especially for Mn and Pb, the fractions bound to iron and manganese oxides account for more than 50% of the total metal concentration for the upper 80 cm section. Hydrothermal components mainly occur in this fraction. And the downcore variations of metal contents and percentages reflect the variations of hydrothermal inputs to the sediments. The high metal levels in the upper core indicate the enhancing influence of hydrothermal activities around on the core H9 during its late stage of sedimentation. The accumulation rates of hydrothermally derived Fe, Mn, Pb, Co, Cu, Ni, and V were evaluated based on their concentrations in the iron and manganese oxide fractions in this study. The results show that the accumulation rate of hydrothermally derived Mn is similar to those obtained from the Mid-ocean Ridges and Lau Basin. However, hydrothermally derived Fe and Cu present a relatively lower level. 展开更多
关键词 elemental accumulation rate sequential leaching hydrothermal sediments Okinawa Trough
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