〓、体液的电解质组成( Composition of electrolyte in body fluids) Table 2 ELEC TROLYTE COMPOSITION OF BOOD FLUIDS Compartmental concentration(mEq/L) Plasma Interstitial fluid Intracellular fluid Positive ion na 142 140 10 K 5 5 150 ca 0.0001 Ma2+ 40 Total 155 153 200 Negative ion CI 103 112 HCO3 27 28 10 HPO4 2- 2 142 SO4 5 Phosphate 6 6 Protein(Pr -) 16 Total 155 153 200二、体液的电解质组成（Composition of electrolyte in body fluids） Table 2 ELECTROLYTE COMPOSITION OF BOOD FLUIDS Compartmental concentration (mEq/L) Plasma Interstitial fluid Intracellular fluid Positive ion Na+ 142 140 10 K + 5 5 150 Ca2+ 5 5 0.0001 Mg2+ 3 3 40 Total 155 153 200 Negative ion Cl− 103 112 3 HCO3 − 27 28 10 HPO4 2− 2 4 142 SO4 2− 1 2 5 Phosphate 6 6 — Protein(Pr − ) 16 1 40 Total 155 153 200