Flame photometer refers to an analytical instrument based on emission spectroscopy. It has the characteristics of high sensitivity, strong selectivity, few samples required, and fast analysis speed, and has been widely used in medical clinical, soil, fertilizer, glass, ceramics, cement, refractory materials, etc.

Factors affecting laboratory flame photometer analysis:

I. Stimulating conditions

1. Flame temperature: If the temperature is too low, the sensitivity will decrease. If the temperature is too high, the alkali metal will be seriously ionized, affecting the linear relationship of the measurement. Factors that affect the flame temperature include the type of gas, the ratio of gas to supporting gas, and the amount of sample solution pumped.

2. Gas pressure: The gas pressure must be kept constant during measurement.

3. Sprayer: If the sprayer is not clean, it is easy to cause poor atomization of the test solution. The test solution must be clear during measurement, and the sprayer must be cleaned with water at any time.

4. Liquid level height: Changes in liquid level height will cause changes in element concentrations after excitation. The test height must be kept consistent during measurement.

II. Types and composition of samples

1. The ionization and self-absorption of elements can cause the calibration curve to bend and the linear range to shrink.

2. The coexisting ions in the sample have an impact on the measurement.

3. The physical properties of the sample should be consistent with the composition of the standard solution.

III. Quality of flame spectrophotometer

1. Monochromator selectivity: The filter of good quality can reduce the interference of coexisting substances.

2. The influence of the surrounding environment on the instrument.

3. Photocells will suffer from fatigue after being used for a long time.