When it comes to the purchase of domestic inductively coupled plasma emission spectrometers, many customers are at a loss. They don't know how to choose enough, whether it depends on the parameters, price or after-sales? Each manufacturer speaks of its products as good and ideal. In addition to customers insisting on their own purchasing principles: meeting the testing requirements, rich after-sales experience, and moderate prices, there are also the following more obscure purchase references, which are the points that the customer cannot detect and the ICP spectrometer manufacturer will not explain. From the principle and important components of the ICP spectrometer, let's explain.
Principle of Inductively Coupled Plasma Emission Spectroscopy (ICP-AES)
Inductively coupled plasma emission spectroscopy ICP-AES is a method of emission spectroscopy that uses inductively coupled plasma as the excitation light source. The atoms or ions of each element become excited under the action of the inductively coupled plasma torch excitation source. The characteristic spectrum emitted when the atom or ion in the state returns to the ground state is used to determine the element composition and content of the substance.
Plasma: An ionized gas with an ionization degree greater than 0.1%, containing a lot of electrons and ions,
It is electrically neutral as a whole and is a good conductor of electricity.
Inductively coupled plasma torch ICP: Flame-like plasma produced by coupling high-frequency current through inductance (induction coil) to ionize and heat the working gas. It has the characteristics of high temperature and high emission intensity of ion lines.
ICP-AES analysis: excitation spectroscopy detection
n Excitation: Use ICP to evaporate, dissociate or decompose the sample into atomic state. Atoms may be further ionized into ionic state, and atoms or ions are excited to emit light in the excitation light
n Spectroscopy: use a spectrometer to decompose the emitted light from the light source into a spectrum arranged by wavelength
n Detection: Use photoelectric devices to detect spectra, qualitatively analyze the sample according to the measured emission characteristic spectral wavelength, and quantitatively analyze the emitted light intensity
n (Note: The spectrometers now appearing on the market, especially domestic inductively coupled plasma emission spectrometers, have almost the same technical origins, and the descriptions of their parameters are similar. Except for the appearance, there is almost no difference. However, important technical means affect the sensitivity of the instrument And stability is all in the two important parts of spectroscopy and detection. Even if the same component from the same manufacturer is installed on the spectrometer with different technical levels, the effect will be different. Moreover, the components used by each manufacturer are different. . And these obscure technical capabilities cannot be quantified, and the parameters are invisible, and spectrometer manufacturers will not explain them to customers. The current situation of domestic equipment is that those who understand the point of installation have their own doors to assemble the instruments and sell them to customers at low prices. Those who came out of the original company and went to a big company can enjoy the cool by relying on a big tree, but in fact, the technical level only stays at the level of understanding installation and assembly. It really involves after-sales and application customers will always find endless troubles in future use. )
n In addition, the application capabilities of inductively coupled plasma emission spectrometers are also very important. ICP spectrometers are general-purpose equipment used in the quantitative analysis of trace and ultra-trace elements in various industries, and there are not many laboratory personnel who understand the nature of samples in various industries. , Usually each field only understands the characteristics of its own samples. However, ICP spectrometer manufacturers have very few professionals who understand analysis. Especially the so-called manufacturers who can complete the assembly and debugging of the entire spectrometer by one person only have a little knowledge of a certain technology. This kind of manufacturer does not have a production license issued by the national quality supervision department, no formal approval certificate, and even the business scope of the business license does not include the "assembly and processing inductively coupled plasma emission spectrometer" item.
The above are the subtle differences of domestic inductively coupled plasma emission spectrometers, which can also be used as reference conditions for customer procurement. In any case, customers purchasing this instrument, even if domestic spectrometers are more than 200,000, there are three important qualifications to check " The registration period and capital of the business license and whether there is an explanation of the assembly and processing of inductively coupled plasma emission spectrometer. The "Proof of Production License is also a CMC Certificate" or "Proof of Formal Approval" issued by the State Administration of Quality and Technical Supervision. If not, there is probably only one person in this type of company who knows how to assemble the instrument, and then assemble it to refill the market. The cost is low, and the market price is also low. However, the quality and after-sales of the instrument will be discovered in the customer's use, but at that time It's too late.
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