木耳碳基硫化钴复合材料的制备及电化学性能研究

以木耳制备的均匀溶液为碳源,加入ZIF-67前驱体,通过水热合成和高温煅烧制备氮硫共掺杂的木耳碳与硫化钴多孔片层复合材料（CoS/NSAC）。实验结果表明,该材料具有大的比表面积和高导电性,电化学性能良好。CoS/NSAC在电流密度为0.5 A/g时比容量达到484.8 F/g,在20 A/g高电流密度下循环5 000次容量保持率为78.8%。用该材料组装的非对称超级电容器具有优异的电化学性能,在0.6 A/g电流密度下比容量为154 F/g。当功率密度为362.3 W/kg时,能量密度为7.4 W·h/kg,经过1 800次循环容量保持率为81.95%。     

木耳和银耳中痕量汞的冷原子荧光法测定

利用还原气化的非色散型装置 ,以湿法消解的方式 ,对木耳和银耳中的痕量汞进行了原子荧光测定 ,结果表明 ,试验回收率在 88 8%～ 1 0 8 8%之间 ,误差 <1 1 2 % ,木耳和银耳中的汞含量分别为 36 9ng/g和 44 7ng/g .     

Investigation of a combustible material in the fire of Hengyang merchant's building

Agaric, a kind of important combustible material in the fire of Hengyang merchant's building, was investigated using different experiment equipments. Its degradation and pyrolysis behavior were studied by means of thermogravimetric and kinetic analysis and pyrolysis gas chromatography–mass spectroscopy analysis. External radiation heat and internal heat were used to ignite the agaric. For external radiation ignition, a series of bench‐scale fire tests were done in cone calorimeter in accordance with ISO 5660. As for the internal heat ignition, a fire test was carried out in a full‐scale room in accordance with ISO 9705. Multi‐parameter measurement, including heat release rate (HRR), mass loss rate (MLR), temperature field and species concentration, has been accomplished. Meanwhile, the process of a full‐scale fire test was numerically simulated. The computational results were consistent with experiment data, which will lay down a good foundation for further study in fire reconstruction of the whole fire. Copyright © 2008 John Wiley & Sons, Ltd.     

顶空-气相色谱法测定木耳中的磷化铝残留量

目的建立木耳中磷化铝残留量的顶空-气相色谱检测方法。方法将样品称量于顶空进样瓶中,加入硫酸溶液,使磷化铝与酸反应生成磷化氢,用气相色谱-氮磷检测器检测磷化氢的含量,得到样品中磷化铝的含量。结果磷化铝在0.05~5.00 mg线性关系良好,相关系数0.995,加标回收率在83.4%~112.6%,相对标准偏差为9.4%~10.2%之间,方法检出限为0.02 mg/kg。结论该方法快速简便、灵敏度高、准确性好,满足相关法规的限量要求,可用于木耳中磷化铝含量的实际检测工作。