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AD5940 Recommended for New Designs
The AD5940 and AD5941 are high precision, low power analog front ends (AFEs) designed for portable applications that require high precision, electrochemical...
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Square wave voltammetry for heavy metal ion Detection

		
	
				

			

									
					    Roht
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 25, 2025 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user is unable to observe the oxidation of heavy metal ions in SWV despite setting the ramp start and peak voltages. The final answer confirms the voltage range across the electrodes (CE and SE) is from -1.2V to 0.4V, suggesting the user check if the electrodes are correctly connected and verify the oxidation potential of the specific metal ions from standard tables.
                        	    

                
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pRampCfg->RampStartVolt = -1200.0f; 


pRampCfg->RampPeakVolt = 400.0f; 


pRampCfg->VzeroStart = 1500.0f; 


pRampCfg->VzeroPeak = 1500.0f;


I have set these parameters in SWV, but I am still unable to see the oxidation of heavy metal ions. Here, if I am not wrong, the SWV ramp starts from 0.3V to 1.9V, but the metal ion oxidation is observed at negative potential. I have also tried to vary the potential ranges but can't optimize. I just want to know if there are any other parameters that need to be optimized that have a major effect on the metal ion oxidation.What parameters need to take care.Please help me.

			

			
									
		                                 
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jan 6, 2025 1:45 AM
            
            
						
			            		
    
		
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    Hi,
    

     Have you connected electrodes CE and SE across the electrolyte? 
    

    If so, with the above configuration, voltage across electrodes(VCE - VSE)  will vary from -1.2V to 0.4V.
    

     Depending on the metal and oxidizing agent, oxidation potential varies, whose values are listed in tables in internet.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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