XRF法快速测定化探样品中铜铅锌镓钛锰

在测定化探样品中Cu、Pb、Zn、Ga、Ti、Mn等元素时,Fe、Ca、Rb、As、Bi、Th等需作为校正元素进行测量,而对于高异常的样品,有时会出现错误的结果.本文提出,采用拓宽标准样品含量范围,对Pb、Ga、Mn等元素不做常规校正,而用被测元素之间做干扰和基体校正,并将回归曲线做分段处理.从而快速、准确地测定Cu、Pb、Zn、Ga、Ti、Mn等元素含量,并最大限度地缩短了测量时间.用于实际样品测定,符合化探质量管理的要求.     

覆高铅材料仿田黄石皮的肉眼识别

田黄是一种聚值能力强的小受众奢侈品。聚值能力强,即小体量却有极其可观的成交价格纪录,比如2006年香港苏富比秋拍会上的田黄瑞狮镇纸,     

Edaravone protects PC12 cells from ischemic-like injury via attenuating the damage to mitochondria

Background： Edaravone had been validated to effectively protect against ischemic injuries. In this study, we investigated the protective effect of edaravone by observing the effects on anti-apoptosis, regulation of Bcl-2/Bax protein expression and recovering from damage to mitochondria after OGD （oxygen-glucose deprivation）-reperfusion. Methods： Viability of PC 12 cells which were injured at different time of OGD injury, was quantified by measuring MTT （2-（4,5-dimethylthia-zol-2-yl）-2,5-diphenyltetrazolium bromide） staining. In addition, PC 12 cells＇ viability was also quantified after their preincubation in different concentration of edaravone for 30 min followed by （OGD）. Furthermore, apoptotic population of PC 12 cells that reinsulted from OGD-reperfusion with or without preincubation with edaravone was determined by flow cytometer analysis, electron microscope and Hoechst/Pl staining. Finally, change of Bcl-2/Bax protein expression was detected by Western blot. Results： （1） The viability of PC12 cells decreased with time （1-12 h） after OGD. We regarded the model of OGD 2 h, then replacing DMEM （Dulbecco＇s Modified Eagle＇s Medium） for another 24 h as an OGD-reperfusion in this research. Furthermore, most PC 12 cells were in the state of apoptosis after OGD-reperfusion. （2） The viability of PC 12 cells preincubated with edaravone at high concentrations （1, 0.1, 0.01 μmol/L） increased significantly with edaravone protecting PC 12 cells from apoptosis after OGD-reperfusion injury. （3） Furthermore, edaravone attenuates the damage of OGD-reperfusion on mitochondria and regulated Bcl-2/Bax protein imbalance expression after OGD-reperfusion. Conclusion： Neuroprotective effects of edaravone on ischemic or other brain injuries may be partly mediated through inhibition of Bcl-2/Bax apoptotic pathways by recovering from the damage of mitochondria.     

浅谈日用陶瓷铅镉溶出量控制的重要性

铅、镉溶出量控制工作是日用陶瓷质量管理中必不可少的,是把好日用陶瓷产品质量和使用安全的关键。通过日用陶瓷产品铅、镉溶出量检测,及时发现铅、镉超标产品,消除给企业信誉和国内外消费者使用安全带来的隐患,能提高企业的经济效益和社会信誉。本文通过对日用陶瓷铅、镉溶出量控制的重要性进行论述,指出铅、镉溶出量控制是日用陶瓷进行质量把关和确保消费者使用安全的关键。     

应用改性粉煤灰处理含铅废水的研究

对改性粉煤灰处理含铅废水进行了实验研究,结果表明,对铅离子的去除效果优于等量未改性粉煤灰和活性炭。吸附时间、废水的pH值、吸附剂用量、温度以及废水中Pb2＋浓度都能影响改性粉煤灰的吸附效果。最适宜的吸附条件是：在室温,pH=8．0,吸附剂用量为1．0g,Pb2＋含量小于0．005mol／L,吸附15min时,改性粉煤灰对废水中Pb2＋的吸附达到饱和。     

“皮蛋豆腐”吃法很科学

皮蛋：很多人喜欢用皮蛋煮粥喝。皮蛋在制作中．多少都会含有一定量的铅。如果摄入过多的铅,将导致智力下降,损害神经系统的发育,引起听力异常,学习能力降低等现象,优其是儿童机体排铅能力要远远低于成人,因此危害更大。     

从"十里堡"、"铅山"的读音说起

"十里堡"是北京市密云县的一个小镇,许多南方人看到"十里堡"都会念成"十里堡(b ǎo)",这是错误的."堡"是多音字,它有三种读音:bǎo、bǔ、pù,"十里堡"的"堡"应念作pù."铅山"是县名,在江西省,"铅"也是多音字,它有qiān和yán两种读音,而"铅山"的"铅"应读作yán,但除了当地人知道这个读音外,其它地方的大多数人是不知道的.曾经有一位生意人,第一次到铅山,由于不知道"铅山"的读音,他在上饶车站向当地人询问"铅(qiān)山"怎么走,结果当地人误听作其它的一个小地名,给他指了一条相反的路,使他多兜了圈子,浪费了钱财和时间,还差点丢了生意.     

橡皮擦

我六岁时入上海的觉民小学一年级,好像整个人都变了。我不再是自由自在的"戆囝仔"(家里人这么叫我),而变成用上海话发音的林玉如,学校里的人连名带姓这样叫我。