Technical problems in potassium-sodium determination with the Beckman spectrophotometer.
D006801:Humans; D011188:Potassium / Q000032:analysis*; D012964:Sodium / Q000032:analysis*; D013053:Spectrophotometry
D012964:Sodium; D011188:Potassium
POTASSIUM/determination; SODIUM/determination; SPECTROPHOTOMETRY