The basic working principle of flame photometer

Flame photometer refers to an analytical instrument with emission spectroscopy as the basic principle, using flame as the excitation light source, and applying a photoelectric detection system to measure the radiation intensity emitted by the excited element from the excited state back to the ground state.
According to its characteristic spectrum and light wave intensity, the element category and its content are judged
.

It includes gas and flame combustion parts, optical parts, photoelectric converters and detection records parts
.

The temperature of the flame is relatively low, so only a few elements can be excited, and the resulting spectrum is relatively simple and the P disturbance is small
.

Flame photometry is particularly suitable for the determination
of alkali metals and alkaline earth metal elements that are easily excited.

The flame photometry is quantitatively analyzed according to the Roman gold formula, that is, I = aXc to the b power, where I is the intensity of the spectral line, c is the content of the element to be measured, and a is the constant related to the evaporation and excitation conditions of the element to be measured; b is the self-priming coefficient, because the flame is used as the excitation light source, its temperature can be maintained by controlling the flow of air and gas, and because of the use of liquid specimens, the influence of the specimen components is less, so in each measurement a is a more stable constant, generally due to the low concentration of the specimen, self-priming can be ignored, so I = λc, and can be analyzed by relative strength measurement methods
.

When the flame photometric analysis is carried out, the liquid to be measured is atomized into a sol into the flame, the element to be measured is generated by thermal dissociation to form ground-state atoms, which are excited in the flame and produce a spectrum, which is decomposed into monochromatic light by the photoelectric system, because the temperature of the flame is relatively low, so only a few elements can be excited, and the resulting spectrum is relatively simple, the interference is small, and the flame photometry is especially suitable for the determination of alkali metals and alkaline earth metals that are easier to excite.