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            首頁   >>   資料下載   >>   O determination in copper samples
            
		
            
	
            
        
            
        
            
	
            
				
            
					
            
						
            
						
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            O determination in copper samples
            
        			
            閱讀：5699      發(fā)布時(shí)間：2015-05-15
        				
            
							
				
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        				  Suitable analyzers
            n ON 900
            n OH 900
            n ONH 2000
            Used accessories
            n Graphite crucibles (90190)
            n Suitable calibration material (NIST or other)
            Settings
            n Comparator level: 20 mV
            n Minimum time: 15 sec
            n Maximum time: 1:30 min
            n Post waiting: 10 sec
            n Base line deviation: 200 mV;
            Step: 16 mV; Time: 10 sec
            n Mode: continuous
            n Outgas
            Time: 45 sec
            Power: 3.5 kW
            n Time
            Purge: 20 sec
            Stability: 45 sec
            n Integration delay
            IR cell: 2 sec
            TC cell: 10 sec
            n Analyse (1)
            Time: 75 sec
            Power (1): 3.0 kW
            Power (2): 3.0 kW
            Sample preparation
            Make sure that the surface of the copper is free from
            contaminations; otherwise clean the sample with acetone
            p.a. and let dry at atmosphere. In case of very low oxygen
            concentrations (< 5 ppm) rinse the sample in nitric acid
            (HNO3) first, than water, last with acetone. Let this sample
            dry at atmosphere and analyze immediay.
            Procedure
            n Prepare ELTRA analyzer (exchange anhydrone, sodium
            hydroxide, copper oxide or Schuetze reagent when
            necessary), clean furnace, sample drop mechanism,
            electrode tip
            n Run three blanks with empty crucibles
            n Calibrate the analyzer with suitable calibration
            material (NIST or other)
            (1) Place empty crucible (90190) on the electrode tip,
            close furnace (F2 Button)
            (2) Weigh calibration material (usually pins)
            (3) Place calibration material in the sample drop
            mechanism and start analysis (F5 Button)
            Repeat steps (1) – (3) at least three times;
            Mark the results and use the calibration function in the
            software.

            
                        
            
                            
            
                                
                                    
            
                                        
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                                        弗爾德（上海）儀器設(shè)備有限公司
                                        
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