分光光度法测定多晶硅中铁和铝

将多晶硅(硅粉)用氢氟酸和硝酸二次溶解,用高氯酸的二次冒烟去除氟离子对铝的干扰,用3 cm的比色皿解决铁低灵敏度带来的误差大的问题。使用分光光度法准确测定多晶硅中铁和铝的含量。研究了显色条件对显色反应的影响,确定最佳实验条件。结果表明,在pH3~5的乙酸-乙酸钠缓冲溶液中,铁与5 mL 0.25 g/L的1,10-二氮杂菲10 min后生成稳定的红色络合物,且在2~10μg/50 mL范围内服从比尔定律;在pH 5.5~6.1的六次亚甲基四胺缓冲溶液中,铝与5 mL 0.3 g/L的铬天青-S在15 min后形成稳定的紫红色络合物,且在4~16μg/50 mL范围内服从比尔定律。用分光光度法能准确测定纯度为99.99%多晶硅(硅粉)中铁和铝含量,并与ICP-AES法测试结果对比,相对误差在5%左右

New Research Progress in Light Induced Degradation of Crystalline Silicon Solar Cell

晶体硅太阳电池一直占据光伏市场的主导地位,关于其光衰减的研究也因此受到了广泛关注。综合评述了近年来国内外晶体硅太阳电池光衰减现象的研究进展,介绍了硼氧缺陷、铁硼对以及铜相关的缺陷导致光衰减的基本机制,着重阐述了硼氧缺陷的产生率、钝化率以及相应的激活能大小与硼氧含量的关系。最后介绍了减弱或避免光衰减的一些措施。The PV market has been always dominated by crystalline silicon solar cell,so many attentions have been paid to the research of light induced degradation of crystalline silicon solar cell.The worldwide research progress of light induced degradation is reviewed and the mechanisms of light induced degradation by BO2i complexes,FeB pairs and Cu-related defects are introduced.The relationship between the BO2i defect generation rate,deactivation rate and corresponding activation energy and boron concentration,oxygen concentration is introduced in details.Finally the technical solutions for reducing or eliminating light induced degradation are proposed.国家自然科学基金(61076056);福建省重大科技专项(2007HZ0005-2

A Comparative Study on the Extration of β-carotene and its Content of the Ten Species of Dunaliella (Chlorophyceae)

建立了从杜氏藻鲜藻中直接提取、纯化β-胡萝卜素及快速检测其含量的新方法，发现在十种（株）杜氏藻dunAlIEllAbArdAuIl中生成β-胡萝卜素的量最高，达藻干重的4.19%，在最佳条件下可达13%，经动物急性毒性实验测得小鼠对杜氏藻β-胡萝卜素的最大耐受量＞240Mg·kg￣（-1）.A new method has been used For extraction,puriFication and determination of thecontent level of β-carotene From the green alga Dunaliella.It has been Found that D .bardauil can accu-mulate 4.19%β-carotene of its dried weight.The content of β-carotene is the highest level in the tenspecies(strains) of Dunaliella tested.Morever under a Favourable condition,D.bardauil is able to pro-duce β-carotene as much as 13% of its dried weight.According to the tolerance determination,thetolerance For rats to the β-carotene extracted From Dunaliella was more than 240 mg·kg￣(-1)

越冬红嘴鸥及栖息环境部分动物弓形虫流行情况分析

为了解越冬红嘴鸥及其栖息环境中部分动物弓形虫流行情况，采用间接血凝实验（IHA）检测红嘴鸥血清386份，并采用巢式PCR扩增弓形虫B1基因，包括检测红嘴鸥血样403份、抚仙湖、滇池等红嘴鸥栖息地环境中褐家鼠128只和散养土鸡34只。结果，弓形虫抗体阳性率为1140%（44/386），弓形虫B1基因阳性检出率为903%（51/565），其中红嘴鸥为323%（13/403），褐家鼠为1719%（22/128），散养土鸡为4706%（16/34）。结果表明，红嘴鸥栖息环境中褐家鼠和散养土鸡存在弓形虫感染情况。该调查初步获悉了来滇越冬红嘴鸥及栖息地动物弓形虫流行情况，对弓形虫病防控具有公共卫生意义，为迁徙候鸟弓形虫病溯源、预防、诊疗提供了参考