Frequently Asked Questions

• General
• What is ALEC?
• How does ALEC apply to me?
• Where can I learn more about ALEC?
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• Experiments/Capabilities
• How do I decide if my samples should be analyzed by GCMS or LCMS?
• How do I decide if my samples should be analyzed by positive or negative mode in ESI-LCMS?
• What concentration should I make up my sample for LCMS?
• What concentration should I make up my sample for ICPMS?
• What concentration should I make up my sample for GCMS?
• Is it OK to have buffer ions in my sample for LCMS?

• What is ALEC?
  ALEC is an acronym for the Arizona Laboratory for Emerging Contaminants. In the lab, various materials and substances (matrices) are analyzed for the presence and amount of organic and inorganic chemicals. For example, a water sample might be analyzed in one of our mass spectrometers to determine what contaminant chemicals are in the water.
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• How does ALEC apply to me?
  Our laboratory examines the compositions of substances that affect us all, from our water sources to the fish we eat.
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• Where can I learn more about ALEC?
  Browse the Education section of the menu for literature on the subject of emerging contaminants. For more information regarding ALEC, feel free to contact us with any questions. Also, we offer various training services for interested users.
• LCMS Buffer ions
To be compatible with LCMS ionization techniques, buffer ions must be volatile. The following LCMS compatible buffer ion additives are volatile: formic acid, ammonium acetate, ammonium formate, and acetic acid (others containing ammonium, acetate, formate, or carbonate are recommended). The following LCMS incompatible buffer ion additives are not volatile: trifluoro acetic acid (TFA), and any additives that contain sodium (Na+), potassium (K+), or phosphate (PO4-3).