1. Fill the burette with test solution and adjust the meniscus to the zero mark

2. If necessary adjust the hydrochloric acid concentration as closely as possible to that of the test solution

3. When the percentage degradation is a lower value than expected, IC is possibly accumulated in the test solution.

4. Subtract the optical density of the blank test solution from that of the sample solution (= corrected optical density).

5. If necessary adjust the hydrochloric acid concentration as closely as possible to that of the test solution (6.2).

6. To compare the effect of different substances on gastric acid secretion proper control solutions comparable with the test solution should be used.

7. RESULTS:The preparation of intradermal test solution of cephalosporins, the skin test method and the criteria in judgement were put forward for references of clinic.

8. Chromaticity is tested by adding humic acid to the test solution and observing the absorption at 390 nm (for the yellow color of the acid).

9. English term or phrase: Apparative parameters Apparative Parameters: Detection: absorption Wave length: 550 nm Scan-speed: 200 nm/min Cuvette: quartz evaluation: the spectrum obtained with the test solution shows an absorbance maximum at 475 min.