Laboratory Determination

• Colorimetric: Sodium

  Albanese and Lein
• Ion Selective Electrode (ISE): Sodium

  Glass membrane electrode
• Colorimetric: Potassium

  Lockhead and Purcell
• Ion Selective Electrode (ISE): Potassium

  Valinomycin
• Colorimetric: Chloride

  Schales and Schales
• Ion Selective Electrode (ISE): Chloride

  Silver Chloride - Silver Sulfide

  (Silver-Silver)
• Colorimetric: Calcium

  Ortho-cresolphthalein Complexone Dyes: Arzeno III
• Ion Selective Electrode (ISE): Calcium

  Liquid Membrane
• Colorimetric: Magnesium

  Dye Lake Method
• Phosphorus

  Fiske-Subbarow Method