Yes, it is already considered the best in the world
Hitachi Z-2000 atomic absorption spectrometer 1. Hitachi Z-2000 (flame/graphite integrated machine) atomic absorption spectrometer Hitachi Z -2000 atomic absorption spectrometer proposes a new concept of atomic absorption: full wavelength, full time period, full information ① Detection 1. DC polarized Zeeman ② Background correction technology is suitable for 72 elements at full wavelength (190-900nm) Two types of flame graphite furnaces All atomization methods use the DC polarized Zeeman method for background correction, which allows full analysis of 72 elements at all wavelengths (190-900nm). The only flame is Zeeman background corrected. 2. The dual-detector method realizes true dual-beam measurement, eliminating errors in time and space. In Zeeman atomic absorption before Z-2000, the time division method is usually used to alternately read the parallel polarization component and the vertical polarization component, and combine these. The two signals are processed and background correction is performed. In the Z-2000, these two polarized components of light are detected simultaneously by two matching photomultiplier tubes. In this method, there is no need to use time division to read, so there is more than 2 times the signal reading time, and more measurement information can be obtained; the DC polarized Zeeman method combined with the patented design of dual detectors truly realizes Background correction is performed at the same wavelength and at the same time to eliminate time errors, achieve full information detection, and ensure excellent sensitivity and detection limits. The picture below shows the optical system of the Z-2000. 3. Integrated design of flame and graphite furnace, no need for spatial or optical switching (software control). Simply select the atomization method using the mouse, without moving the atomizer or resetting the optical system. Fully built-in design; vibration-free optical platform. The peak width calculation method is selected in graphite furnace analysis, and the linear range of the calibration curve is larger. 4. Excellent S/N (signal-to-noise) ratio. The picture on the right shows a comparison of graphite furnace analysis using our company's previous products and Z-2000 atomic absorption. At a wavelength of 193.7nm, 40uL 1ug/L As standard solution was injected. , measured under the same conditions. Since the noise amplitude is reduced by 50% compared with before, the resulting atomic absorption signal peak is clearer and a lower detection limit can be obtained. ① Hitachi Z-2000 is the world's first true double-beam atomic absorption spectrometer, the only one that Full wavelength, full time period, full information detection. ② Principle of the DC polarization Zeeman method: When the atoms to be measured in the sample are introduced into a magnetic field, the polarization component P// in the analysis spectral line that is parallel to the magnetic field will be absorbed by these atoms, while the polarization component P⊥ perpendicular to the magnetic field will be absorbed by these atoms. It is difficult to be absorbed by these atoms. The background absorption formed by molecules and particles does not change under the influence of a magnetic field. Therefore, the background absorbs the two polarization components P// and P⊥ exactly the same. By subtracting the measured values ??of P// and P⊥, the background absorption is eliminated while the atomic absorption signal is retained. Since P// and P⊥ are measured at the same wavelength, it is a true dual-beam spectrophotometer with accurate background correction over the full wavelength range. Two perfectly matched photomultiplier tubes detect P/ simultaneously. / and P⊥ components to achieve true full information detection.