The detection range of a photometer is affected by many factors, such as instrument performance, measurement method, sample properties, and operating conditions. Different types of photometers have different detection ranges. The detection range can be expanded or optimized by appropriate sample pretreatment, adjusting instrument parameters, and using standard curve methods.

1. UV-Vis spectrophotometer

Absorbance range: generally around -0.3~3.0Abs, some high-performance instruments may have a wider range.

Concentration range: it varies greatly for different substances. For common organic analysis, the concentration range can be from a few nanograms/ml to tens of milligrams/ml. In water quality analysis, the detection concentration range of some metal ions may be in the microgram/liter to milligram/liter level.

2. Infrared spectrophotometer

It can usually detect samples from trace components to higher concentrations. In organic structure analysis, specific functional groups can be detected at concentrations of one part per million or even lower. Some high-concentration samples can also be effectively analyzed.

In quantitative analysis, the concentration range varies depending on the specific substance and measurement method, but generally covers a range from a few ppm (one part per million) to tens of percent.

3. Atomic absorption spectrophotometer

The element concentration range is usually from a few nanograms/ml to tens of micrograms/ml or even higher. For some common metal elements, the detection range can be from a few micrograms/liter in low-concentration environmental water samples to tens of milligrams/liter in higher concentrations of industrial wastewater.

For the detection of some trace elements, the detection limit can reach nanograms/ml or even lower.