指示剂

All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on th...

本法用硝酸铁为标准液，水杨酸钠作指示剂，在 pH=3左右作滴定；当溶液呈橙黄色时，加入适量的乙醇，使其浓度在终点时仍不低于50%。

All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the r...

本法用硝酸铁为标准液，水杨酸钠作指示剂，在 pH=3左右作滴定；当溶液呈橙黄色时，加入适量的乙醇，使其浓度在终点时仍不低于50%。

All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reac...

本法用硝酸铁为标准液，水杨酸钠作指示剂，在 pH=3左右作滴定；当溶液呈橙黄色时，加入适量的乙醇，使其浓度在终点时仍不低于50%。

This error is referred to as an indicator error, and it is indeterminate.

这个误差被称为指示剂误差，而这个误差是不确定的。

Check the indicator for correct function of the drying agent on arrival of the consignment and at appropriate intervals.

每隔一定的时间检查颜色指示剂以确定干燥剂是否有效。

Therefore, the illite polytype might be an effective indictor for mineralization of porphyry copper deposit.

在此，斑岩铜矿中伊利石多型可能成为有效的矿化晕指示剂。

We can do many interesting experiments in science class. That's why we like science class very much. However, some experiments are difficult and dangerous. For example, something acid and alkaline will erode our body. Besides, indicators are very dangerous. So, be very careful to do any experiments inscience class! This is our experiment in science class.

我们喜欢上自然课，因为上自然课可以做实验，我们的自然实验有些有趣，有些困难，不过全都非常好玩，可是有些实验会使我们得生命有危险，像水溶液实验，因为酸、碱性的水溶液，会是我们的身体腐蚀，指示剂也非常危险，所以做实验要非常小心，以上就是我们的自然实验。

In the form of a water solution or as litmus paper, it is the oldest and most-used indicator of whether a substance is an acid or a base.

它的水溶液，或者做成石蕊纸后，是最古老和最常用的指示剂，可以指示一种物质是酸还是碱。

Due to the logarithmic nature of the pH curve, the transitions are, in general, extremely sharp; and, thus, a single drop of titrant just before the endpoint can change the pH significantly - leading to an immediate colour change in the indicator.

由于PH曲线的对数性质，一般而言转变是非常明显的，因此，等当点之前的一滴滴定液能使PH发生显著变化，引进指示剂颜色突变。

In transverse section, from migmatite →mylonitized migmatite →ultramylonite, phillite mylonite, the contents of Au, Ag, As, S, Cu, Bi, Se and W increase, the ratios of Au/Ag, S/Se and Cu/.

在矿床垂深剖面Au及伴生微量元素Bi、Se和S具有自上而下升高的趋势；Ag和W自160m至0m则下降，Au/Ag、S/Se和Bi/Au比值自上而下升高，这可以作为矿体延深评价及找矿地球化学的指示剂。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。