How can the sensitivity of a mass spectrometer be vividly understood?

The microplate analyzer is essentially a disguised photophotoelectric colorimeter or spectrophotometer, and the basic working principle is basically the same as the main structure and photoelectric colorimeter. The light waves emitted by the light source lamp are turned into a beam of monochromatic light through a filter or monochromator, which enters the specimen to be tested in a plastic microplate. Part of the monochromatic light is absorbed by the specimen, and the other part is irradiated to the photodetector through the specimen, and the photodetector converts these optical signals into corresponding electrical signals, and the electrical signals are sent to the microprocessor for data processing and calculation after signal processing such as pre-amplification, logarithmic amplification, and analog-to-digital conversion, and then the results are displayed by the display and printer.

The microprocessor also moves the microplate through a control circuit that controls the movement of the mechanical drive mechanism in the X and Y directions, thus enabling an automated sample filling detection process. Some microplate labels use manual micro-movements

ppm - part per million, that is, one millionth, is a dimensionless quantity, if you know what ppm means, you also need to understand whether it is a volume ratio or a mass ratio or a weight ratio.

The vivid point of sensitivity is explained by the sensitivity of the reflection. High sensitivity indicates that the detector is prone to allergy to the detected substance (that is, it is easy to detect, that is, the detection limit is small).

Sensitivity is the lowest amount of component that mass spectrometry can measure. ppm is a unit of content, translated into Chinese is one part per million, if it is a mass ratio, it is a ton A with one gram of B, the content of B is 1 ppm.

Vivid understanding? Abstract things are really hard to come to life. ppm is one part per million.

If the detection limit of a substance is 1 ng l, it means that the substance is highly sensitive. If the detection limit can be lowered further, the sensitivity can be further improved.

In liquids, ppm usually corresponds to mg l

That is, the light waves corresponding to different wavelengths, the test elements can make more sensitive changes, and they have good spectral sensitivity.

Because in some wavelength ranges, the radiation of the light wave is stronger, and the element is more responsive, while some of the weaker radiation ranges are more sluggish or unresponsive. In this case, filters can be set to eliminate the effects of certain wavelengths to increase the overall measurement range and increase sensitivity.