AA-7090 type atomic absorption spectrophotometer, eight-lamp automatic turret, fast automatic selection of element lamps, can truly achieve the sequential determination of multiple elements in the same project, wavelength setting: 180nm~ 900nm, computer-controlled automatic wavelength fast scanning. The original imported transverse heating graphite furnace adopts the dual background correction mode of vertical AC Zeeman and deuterium lamps to meet the analysis needs of different users; the combustion head: 10cm slit length, all titanium material, high salt resistance and corrosion resistance; the AC Zeeman background correction magnetic field is continuously adjustable at 0.6T-1.1T to reduce the influence of the inversion effect on the analysis sensitivity; the copper absorbance of 1ppm is better than 0.2Abs; the heating rate: 2500  C/s, adjustable; the graphite furnace visual system, positioning the injection needle, observing the state of the sample in the graphite tube and optimizing the temperature program of the graphite furnace, etc.; the maximum working temperature of the graphite furnace: 2700  C; the term mode of the graphite furnace, improving the effective utilization rate of the protective gas, prolonging the gas use time, and reducing the use cost; graphite furnace Furnace double protection gas circuit, extend the life of graphite tube by controlling the inner gas circuit and auxiliary gas circuit; element lamp selection, wavelength selection, slit selection, burner head height and flow setting, automatic ignition, atomizer switching, deuterium lamp light path switching, graphite furnace power switch and other functions can be realized through software; deuterium lamp fine-tuning mechanism, adjusting the deuterium lamp light to coincide with the element light line; with laughing gas safety lock and related safety mechanism, laughing gas-acetylene flame is safer to use.