The application of electrothermal atomic absorption spectrometry with tungsten wire as atomizer in atomic absorption has a history of more than 30 years, but there has been no commercial instrument.Tungsten wire has the advantages of high melting point (3422 ℃), fast heating rate (30 K/ms), relative chemical inertness, small size, low cost and low energy consumption. 

Combined with the advantages of compact charge-coupled device (CCD) as detector, the instrument as a whole has the advantages of low energy consumption and small size. With the support of the national "11th five-year" science and technology support program, bfrelli analytical instrument company has recently launched the portable tungsten wire electrothermal atomic absorption spectrometer (w-coil ETAAS) [8]. W-coil method has been applied in the simultaneous determination of multiple elements [9], chemical improvers [10], electrothermal evaporation devices, etc. Therefore, in this study, the problem of high blank space was solved by liquid-liquid extraction, and trace zinc in actual samples was determined by w-coil ETAAS method.