You Would Like to Offer a Service to the Researchers

You would like to offer a service to the researchers in your institution for identification and quantification of organic acids produced by microorganisms using your gas chromatograph-mass spectrometer system.Before selecting an ionization technique,you choose to run trial samples with electron and chemical ionization.You notice that the m/z of the acidic ions produced by chemical ionization is higher than the m/z produced using electron ionization.What is the cause of this disparity?

A) Your mass spectrometer has not been standardized correctly for the use of liquid media because both values should be the same.
B) The organic acids are not being separated into separate peaks by the gas chromatograph,producing a faulty reading by the spectrometer's detector.
C) The fragmented ions of organic acids typically have more than one single charge.
D) Organic acids are not fully fragmented by chemical ionization,yielding a higher mass number.