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颜卿 《广东微量元素科学》2008,15(11):64-64
红薯,又名叫地瓜、甘薯、番薯、白薯、甜薯、红苕、红芋等,属旋花科甘薯种、蔓生性草本植物,产量仅次于马铃薯,是世界十大农作物中第二位,我国从南到北、从东到西,广为种植,普遍食用。 相似文献
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原子吸收光谱法测定水生生物体内铜、锌、镍、铬、铅、镉 总被引:7,自引:0,他引:7
用硝酸-高氯酸体系消解螺蛳和水葫芦样品,采用火焰原子吸收光谱法测定铜、锌、镍、铬,用石墨炉原子吸收光谱法测定铅、镉。铜、锌、镍、铬、铅、镉的检出限分别为0.328、0.126、0.271、0.416、0.006 64、0.001 15 mg/kg,线性相关系数不小于0.999 0,测定结果的相对标准偏差为1.1%~3.7%,加标回收率为86.0%~94.2%。 相似文献
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艾叶为菊科蒿属多年生草本植物艾的干燥叶,传统医学认为艾叶有理气血,逐寒湿、温经、止血、安胎等作用。现代研究证明,艾叶具有抗菌及抗病毒,平喘、镇咳及祛痰,止血及抗凝血,镇静及抗过敏,护肝利胆等作用。艾叶主要含挥发油、鞣质、黄酮类、甾醇类、多糖类和微量元素等成分。据文献报道艾叶挥发油中主要为桉油精、萜品烯醇、蒿醇、樟脑、龙 相似文献
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王艳君 《中国无机分析化学》2015,5(3)
通过样品处理、干扰试验、方法检出限、准确性和精密度试验,确定了最佳实验条件,建立了电感耦合等离子体-原子发射光谱法测定铜磁铁矿中铜、锰、铝、钙、镁、钛和磷含量的方法。试料经盐酸、硝酸、氢氟酸、高氯酸分解,用盐酸溶解盐类,过滤,采用电感耦合等离子体发射光谱法同时测定滤液中铜、锰、铝、钙、镁、钛和磷量。方法检出限:锰、钛和磷小于0.00085%,其它元素小于0.0054%,分析结果与分光光度法、XRF法和AAS法分析结果一致,8个实验室对5个水平样品进行协同试验给出了方法的精密度。 相似文献
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颜卿 《广东微量元素科学》2009,16(4):40-40
人们都想了解和掌握必需微量元素和宏量元素含量配合较为均衡的蔬菜。根据专家们的研究发现,在人们食用的蔬菜中,含人体必需宏量元素和微量元素适量同时较为均衡的蔬菜有20多种,它们是:白萝卜、胡萝卜、小白菜、小青菜、油菜、蕹菜、白茱苔、蒜苗、油角豆、马兰头、韭菜、苦瓜、芪椰菜、莴苣笋(茎)、山药、芦笋、蒜苔、藕、红辣椒、青辣椒等,这些蔬菜所含的人体必需微量元素如:Fe、Me、Zn、Cu、Se等和人体必需宏量元素如K、Na、Ca、Mg等都是中等量,并且含量都是比较均衡,为人们日常调配饮食,购买、 相似文献
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《化学分析计量》2014,(4):7
<正>1报道范围分析测试技术,计量行业的法规、政策、标准,标准物质的研制及应用,分析、计量仪器的新产品、新技术、新方法,仪器检定、使用、维修经验,相关专业管理技术、文献综述、专题讲座、专题评论、发展动态及相关信息等。2投稿要求(1)文章重点突出,条理清楚,语句通顺,文字简练,数据可靠,结论恰当,避免重复、繁琐,不用口语、俗语等。全文包括图表在内字数一般在5 000~10 000字为宜。(2)题名应准确、简洁、鲜明,一般不超过20个汉字。作者单位包括全称、所在地、邮编。若作者出自多个单位,应按作者标注的顺序分别列出,在各自单位名称前加"1."",2."",3."。 相似文献
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油页岩中微量元素赋存形态的研究 总被引:1,自引:0,他引:1
通过浮沉实验及脱灰实验对抚顺、龙口、茂名3种油页岩样中部分微量元素进行了赋存形态的研究。结果表明,浮沉实验所得微量元素的赋存状态结果与脱灰实验基本一致,抚顺、龙口、茂名3种油页岩中大部分微量元素以无机态赋存,但也有所区别,抚顺、龙口、茂名油页岩中的元素V、Mn、Zn、Sr、Mo、Ta以及抚顺油页岩中的Cr、Te,龙口油页岩中的Cd、Sn,茂名油页岩中的Cd、Sn、Pb,主要赋存于无机矿物中;茂名油页岩中的Cr、Te,抚顺油页岩中的Cd,龙口油页岩中的Pb有相对较多的比例富集于有机质部分;龙口、茂名油页岩中的元素Co,抚顺油页岩中的Co、Sn、Pb,更多地富集于黏土矿中,但也有少部分富集于有机质中。 相似文献
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电池浆料中颗粒状活性物质的粒度大小和分散均匀性对电池的内阻、 电压、 局部表面电流和总极化程度等性能有直接影响, 实现对其的在线实时测量对电池的质量控制具有重要意义. 基于电池浆料的高固含量、 高黏度和低透光性的特点, 本文利用超声衰减谱的方式测量了其粒度分布(PSD). 应用于电池浆料的粒度分布测量的最大难点是其利用超声衰减谱法预测粒度分布的模型需要难以获得的分散相和连续相的物性参数. 本文采用主成分分析(PCA)结合误差反向传播(BP)神经网络建立预测模型解决了超声衰减谱法的难点, 并引入遗传算法(GA)优化BP神经网络的初始阈值和权值. 通过以LiCoO2为活性物质的电池浆料进行了验证, 结果表明, PCA-GA-BP神经网络能够有效对不同固含量电池浆料的粒度分布进行预测, 预测值与真实值的峰形重合度高, 峰高偏差小, 两者的均方误差为0.1358, 拟合度(R2)为0.9816, 说明超声衰减谱法可作为测量电池浆料粒度分布的重要方式. 相似文献
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镉镍电池和氢镍电池同以镍电极作正极,但两者的充、放电过程,特别是过充、过放时所表现的特性存在诸多差异,我们比较、探讨了影响这两种电池性能的差异因素,并由此制定了改进电池性能的有效工艺生产措施. 相似文献
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Li-O2 battery is the leading next-generation battery system, which is known for its extremely high theoretic specific energy. However, the Li metal used in Li-O2 batteries suffers from low Li utilization and safety hazards. In this work, as an alternative to Li anode, Li21Si5 powders, which are synthesized by an easy mechanical process, are incorporated into a Li-ion oxygen battery. The electrochemical property of the prepared battery and its cycling stability are investigated. Without electrochemical prelithiation, the pursuit of Li-Si alloy anodes in this study provides an easy and scalable strategy for preparing Li-ion oxygen batteries. 相似文献
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Guangda Chen Yangyang Xu Lei Huang Aboulkader Ibro Douka Bao Yu Xia 《Journal of Energy Chemistry》2021,(4):183-189
Developing robust oxygen electrocatalyst with high-performance is very significant for practical rechargeable Zn-air battery.We report herein the preparation of three-dimensional continuous nanocarbon network composed of interconnected nitrogen-doped carbon nanotubes and its application as oxygen electrocatalysis in rechargeable Zn-air battery.Except the excellent electrochemical bifunctionality,this carbon nanotube matrix also delivers an impressive battery performance.Specifically,an opencircuit voltage of 1.50 V as well as a high power density of 220 m W cm-2 with remarkable cycling stability for 1600 h is achieved in the rechargeable Zn-air battery.The study not only provides an efficient bifunctional oxygen electrocatalyst but more importantly may pave significant concepts in designing robust electrode for long-life rechargeable Zn-air battery and other energy technologies. 相似文献
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The active materials constitute the heart of any battery so that unambiguous determination of their intrinsic properties is of essential importance to achieve progress in battery research. A variety of in situ techniques with high lateral resolution has been developed or adapted for battery research. Surprisingly, nanoelectrochemistry is not attracting sufficient attention from the battery community despite the existing examples of relevant in situ and highly resolved spatiotemporal information. Herein, the important role of nanoelectrochemistry in battery research is highlighted to help encourage its use in this field. In the first part, two examples in which the use of nanoelectrochemistry is a must are provided, that is, determination of intrinsic kinetics of active materials and understanding of relationships between particle structure and electrochemical activity. In the second part, pros and cons of three mature nanoelectrochemistry techniques in battery research, that is, particle-on-a-stick measurements, nanoimpact measurements, and scanning electrochemical probe microscopy, are discussed providing representative examples. 相似文献
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A new gas-utilizing battery using mixed gas of O(2) and CO(2) was developed and proved its very high discharge capacity. The capacity reached three times as much as that of a non-aqueous Li-air (O(2)) battery. The unique point of the battery is expected to be the rapid consumption of superoxide anion radical by CO(2) as well as the slow filling property of the Li(2)CO(3) in the cathode. 相似文献