新人遇问题，咨询一下。现在的仪器不知道能不能用氮气呀。

看看你的滤光片是不是脏了？拿下来擦干净再装好试试

还是算算相对极性吧．

这个现象肯定是没有气体了啊

北京纳克应该有，因为我们买过他们的定氧仪，用的也是石墨坩埚

柱子老化温度一般要低于柱子的最大允许温度,并且载气流速不能太大,否则柱效流失,老化时间要长一点24小时.还有载气存度大高,不然柱子就会损坏,难以修复了.

换了EPC，没问题了！

自己配制样品测定一下，同时做好相关实验条件和检验条件记录

我用过，该仪器可配程序升温控制器，单都配置型号为F1301主要技术性能指标：1.温度控制方式---定温、线性升温、多阶线性升温。2.温度控制范围：? 0---400度3.时间范围：? 0---190分? 步长为0.1 0.5 1 2 4 8 10分4.升温速率：? 0 0.2 0.5 1 2 3 5 7.5 15 30? 度/min5.温度稳定性：正负0.1度6.升温速率精度0.1%7.升温速率稳定性? 0.01%8.时间精度及稳定性： 正负0.01%9.初始温度给定范围：0---400度10.上限温度给定范围：0---400度11.消耗功率： 30瓦12.体积： 340*430*140

据说很好用，我开个小店买这个得了

这数字从哪里来的？

看看载气是否纯,管线是否有污染.

这个是传说中的β-锡酸沉淀?定容时加酸才行

这几个元素的灵敏度在ICP上本来不高，尤其是As，还是用AAS效果会好一点

检测器可能有污染。要清洁一下。

放在库房呗，不过要布管线，要花钱

Important physical properties of silicon steels include resistivity, saturation induction, magneto-crystalline anisotropy, magnetostriction, and Curie temperature. Resistivity, which is quite low in iron, increases markedly with the addition of silicon. Higher resistivity lessens the core loss by reducing the eddy current component. Raising the silicon content will lower magnetostriction, but processing becomes more difficult. The high Curie temperature of iron will be lowered by alloying elements, but the decrease is of little importance to the user of silicon steels.The magnetization process is influenced by impurities, grain orientation, grain size, strain, strip thickness, and surface smoothness. One of the most important ways to improve soft magnetic materials is to remove impurities, which interfere with domain-wall movement; they are least harmful if present in solid solution. Compared with other commercial steels, silicon steel is exceptionally pure. Because carbon, an interstitial impurity, can harm low induction permeability, it must be removed before the steel is annealed to develop the final texture.The mechanism for the growth of grains with cube-on-edge orientation during the final anneal is not completely understood. The process involves secondary recrystallization, which, by definition, is characterized by accelerated growth of one set of grains in an already recrystallized matrix.For secondary recrystallization, normal grain growth must be inhibited in some manner. As the temperature is raised, certain grains break loose from the inhibiting forces, and grow extensively at the expense of their neighbors. Producers know that, on a practical basis, appropriate cold rolling and recrystallization sequences must be carefully followed to obtain the desired secondary recrystallization nuclei and the correct texture. Today`s silicon steels use MnS as the grain growth inhibitor, but other compounds, such as carbides, oxides, or nitrides, are also effective.

含量不高，对样品前处理以及试剂器皿要求很高

甲醛35%到40%俗称福尔马林，此时的水溶液很容易挥发成气态甲醛，加热更甚，做此类的检验要注意自己的保护工作。用滴定其实也吧是很费时间的，用气相色谱也可以，就看你是定性还是定量的检测了~~~~~~~~~~~~·

另外，还要看LZ的预算了

在工作站里设置方法的时候输入标准浓度啊！好好看看说明书！

没问题，别直接往里打水就行

一般是小于等于20% ，可以选择高浓度的标样做，浓度在线性范围里准确度会高些

还不如直接买铂金坩埚呢

换不同的柱子后倒峰还是在同一地方出现吗？若是的话柱子应该没坏，喷嘴已清洗，会不会是进样口脏了？

如果基体匹配的话，出现负值没问题，说明样品含量甚低

活性炭过滤网就可以

工作的时候，仪器房的室温保持在25度左右就行了

我们会用锰作测试,调节光路最优的位置,看其每次的强度比较,就可大约知道仪器状态了.

一般瓶子上不写的话，在每一箱内会有个合格证，那上面应该有保质期。