Abstract: An electrothermal vaporization atomic fluorescence spectrometer for determination of Cadmium comprising a sampling system, a light source, an atomizer, a light path system, a detection system, and a display device. The sampling system includes an electrothermal vaporization device and a capture trap; the capture trap comprises a Tungsten or Molybdenum coil (6), a holder (15), a cover (7) and a power supply (17); the cover (7) and the holder (15) form a sealed space; the Tungsten or Molybdenum coil (6) is arranged on the holder (15); the Tungsten or Molybdenum coil (6) is located inside the sealed space formed by the cover (7) and the holder (15); and the cover (7) is provided with an inlet (12) and an outlet (13) thereon. An electrothermal vaporization atomic fluorescence spectroscopy for determination of Cadmium is also provided.

Abstract: The Ultraviolet pretreatment device in the present invention relates to an interface technique in the field of coupling technology for the analysis of chemical element species. The objective is to provide an Ultraviolet pretreatment device with simple structure, enhanced UV illuminance, and high digestion efficiency. The Ultraviolet pretreatment device in the present invention comprises a low pressure Mercury lamp and a quartz tube, wherein, the low pressure Mercury lamp comprises a lamp tube, electrodes and a power source. The quartz tube is located within the lamp tube, the two ends of the quartz tube are fixedly and respectively joined with the tube wall of the lamp tube, the inner wall of the lamp tube and the outer wall of the quartz tube form a sealed gas chamber, and the electrodes are located in the gas chamber.

Abstract: An electrothermal vaporization atomic fluorescence spectrometer for determination of Cadmium comprising a sampling system, a light source, an atomizer, a light path system, a detection system, and a display device. The sampling system includes an electrothermal vaporization device and a capture trap; the capture trap comprises a Tungsten or Molybdenum coil (6), a holder (15), a cover (7) and a power supply (17); the cover (7) and the holder (15) form a sealed space; the Tungsten or Molybdenum coil (6) is arranged on the holder (15); the Tungsten or Molybdenum coil (6) is located inside the sealed space formed by the cover (7) and the holder (15); and the cover (7) is provided with an inlet (12) and an outlet (13) thereon. An electrothermal vaporization atomic fluorescence spectroscopy for determination of Cadmium is also provided.

Abstract: The present invention discloses a method of synthesizing single walled carbon nanotubes. Highly pure single walled carbon nanotubes is synthesized by the catalytic decomposition of carbon containing gases with Fe, Co, Ni, Mo and W catalysts in the presence of a small mount of water vapor, which can prohibit the generation of amorphous carbon and multi-walled carbon nanotubes on the surface of the catalysts and promote the generation of single-walled carbon nanotubes.