公开(公告)号：EP2921844A4

公开(公告)日：2016-07-20

申请号：EP13855687

申请日：2013-11-07

申请人： BEIJING JITIAN INSTR CO LTD

发明人： LIU JIXIN ,  FENG LI ,  ZHENGN FENGXI ,  LU DONG ,  LI JUNWEI

IPC分类号： G01N21/64 ,  B01D53/02 ,  B01J20/00 ,  G01J3/44 ,  G01N1/40 ,  G01N1/44 ,  G01N21/74 ,  G01N31/00 ,  G01N33/00

CPC分类号： G01N1/4022 ,  B01D53/02 ,  B01D53/64 ,  B01D2253/1122 ,  B01D2255/1021 ,  B01D2255/1025 ,  B01D2255/106 ,  B01D2255/20769 ,  B01D2255/20776 ,  B01D2257/60 ,  B01D2257/602 ,  B01D2257/80 ,  B01J20/02 ,  G01J3/4406 ,  G01N1/44 ,  G01N21/6404 ,  G01N21/74 ,  G01N2021/6406 ,  G01N2033/0019

摘要： A method and instrument for simultaneously measuring mercury and cadmium by direct sample injection without the need of sample digestion comprising the steps of: heating a sample in an oxygen atmosphere, with the temperature being controlled as 120-500°C, so that most of the Hg and decomposition products in the sample are evolved; carrying Hg and evolved substances by an air flow into a tubular catalyst furnace for further decomposition, and amalgamating and absorbing Hg with gold while Cd still exists in the sample; placing the treated sample in a pyrolysis furnace for further thermal decomposition, so that Cd and residual Hg in the sample are evaporated at a high temperature; carrying same by argon gas into a cadmium atom collection trap, selectively trapping cadmium using a tungsten wire, and absorbing the residual mercury using a mercury collection trap; and in an argon-hydrogen atmosphere, heating the tungsten wire or a molybdenum wire and gold amalgam in turn to release Cd and Hg, and carrying same by argon-hydrogen gas into an atomic fluorescence spectrometer for on-line detection. On the basis of realizing the function of simultaneous measurement of Hg and Cd in a sample, the entire structure of a detection instrument is simplified, realizing the minimization, facilitating conventional analysis and urgent demands, being capable of being loaded on a vehicle for field application, and having a prospect of application in on-site detection.