Atomic absorption spectrophotometer gas chromatography and liquid chromatography separation

Application of atomic absorption spectrophotometer in organic analysis of factories:

Many organic matters can be determined by indirect method. 8-hydroxyquinoline (Cu), alcohols (Cr), aldehydes (Ag), esters (Fe), phenols (Fe), diacetyl (Ni), phthalic acid (Cu), fatty amines (co), amino acids (Cu), vitamin C (Ni), aniline (Co), ramifene (Cu), quinine formate (Zn), organic anhydride (Fe), benzylpenicillin (Cu), glucose (Ca), epoxide hydrolase (PbO), halogen Many organic compounds such as Ag are indirectly determined by stoichiometric reactions with corresponding metal elements.

Application of metal chemical speciation analysis:

Different organic compounds of the same metal elements can be analyzed by gas chromatography and liquid chromatography followed by atomic absorption spectrometry. For example, 5 kinds of alkyl lead in gasoline, 5 kinds of alkyl lead, alkyl selenium, alkyl arsenic, alkyl tin in atmosphere, alkyl arsenic, alkyl lead, alkyl mercury, organic chromium in water, alkyl lead, alkyl mercury, alkyl mercury, organic zinc, organic copper and other metal organic compounds in biology can be absorbed by different types of spectroscopic atoms. The method is used for identification and determination.

(1) About the choice of flame atomic absorption spectrophotometer: If the user determines to purchase flame atomic absorption spectrophotometer, to combine their own work needs to choose the appropriate grade. At present, the domestic technology of flame-type instrument is mature. As far as the sensitivity and precision of detection limit are concerned, the domestic manufacturers all meet the national standards. Some technical indexes have reached or exceeded the same type of instrument abroad. There is no big difference between manufacturers. The degree of automation and auxiliary function is different.

(2) About the choice of graphite furnace atomic absorption spectrometer: Graphite furnace atomic absorption spectrometry, there are several characteristics, first, high temperature, can be used as high temperature elements (that is, high atomization temperature elements), such as: Si, Al, Ba, Mo, W, Be, Zr; second, high sensitivity, generally higher than the flame method 3-5 orders of magnitude, suitable for doing. Trace analysis; three, the sample size is small, generally at the micro rise (mu L) level. However, the operation of the instrument is complex and the cost of analysis is relatively high. Especially when the automatic sampler is not used, the manual sampling is required to the operator's skill.

First of all, it is necessary to make clear what problems the purchase of instruments will solve and analyze what the requirements are. Because different analysis requirements, the functional requirements of the instrument will have different emphasis, and any one of the instruments is not omnipotent.

Secondly, it is necessary to consider applicability and economy. We should combine our own economic strength, technical level and personnel quality to choose the model that can meet our work requirements.

Manufacturers of atomic absorption spectrophotometer