A MS should not be set to look for mass fragments too low or else one may detect air (found as m/z 28 due to nitrogen), carbon dioxide (m/z 44) or other possible interference.
MS不應設定成尋找太低質量的片段，否則，會測到空氣（發現如質荷比為28的氮氣），二氧化碳（m/z=44）或其他可能的干擾。