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Composition of buffer solutions.
| Composition |
Gastric fluid |
Intestinal fluid |
|||
|---|---|---|---|---|---|
| pH 1.6 | pH 3.0 | pH 5.0 | pH 5.8 | pH 6.5 | |
| Hydrochloric acid (mM) | 25.1 | ||||
| Ortho-phosphoric acid (mM) | 5.5 | ||||
| Monobasic sodium phosphate (mM) | 32 | 133.8 | 28.4 | ||
| Sodium hydroxide (mM) | 3.1 | 82 | 8.7 | ||
| Maleic acid (mM) | 55 | ||||
| pH (adjusted by HCl 0.1 N or NaOH 0.1 N) | 1.6 | 3.0 | 5.0 | 5.8 | 6.5 |
