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王昊 《中国无机分析化学》2019,9(3):10-12
采用直接测汞仪-土壤标准物质绘制工作曲线法测定土壤中的汞,样品无需前处理,减小了系统误差和基体干扰。绘制的低、高浓度标准曲线线性相关系数分别是0.999 9和0.999 7,可以准确测定汞含量在0~300ng范围内的样品,准确度高,重现性和稳定性好,相对标准偏差小于2.2%,符合土壤的检测要求,适用于大批量土壤样品的检测。 相似文献
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Preparation and characterization of sulfur-polypyrrole composites with controlled morphology as high capacity cathode for lithium batteries 总被引:1,自引:0,他引:1
Xiao LiangZhaoyin Wen Yu Liu Xiuyan WangHao Zhang Meifen Wu Lezhi Huang 《Solid State Ionics》2011,192(1):347-350
Sulfur was highly combined with two types of polypyrrole (PPy) in granular (G-PPy) and tubular(T-PPy) morphology by in-situ oxidation and co-heating methods. The morphology of polypyrrole shows a significant effect on the dispersion status and electrochemical behaviors of the sulfur. A stable capacity close to 500 mAh/g was maintained over 60 cycles for the S/T-PPy composite. Electrochemical measurement results suggest that the S/T-PPy composite is obviously superior to the S/G-PPy composite. It is suggested that the as-proposed tubular PPy could be a promising electric matrix for sulfur active host for a high energy density lithium-sulfur battery. 相似文献
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