The present invention includes a method of detecting contamination in a fluid sample includes bringing a fluid sample into contact with a pair of spaced apart electrodes and applying a plurality of voltages across the electrodes, wherein {HEAD ~ the plurality} of voltages vary in magnitude between {TAIL ~ a first and second voltage level} 
The present invention includes a method of detecting contamination in a fluid sample includes bringing a fluid sample into contact with a pair of spaced apart electrodes and applying a plurality of voltages across the electrodes , wherein { HEAD ~ the plurality } of voltages vary in magnitude between { TAIL ~ a first and second voltage level }
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