[Determination of sulfur dioxide in traditional Chinese medicine by derivative fluorometry].

OBJECTIVE

To establish a derivative fluorometry method for the determination of sulfur dioxide residues in traditional Chinese medicine.

METHOD: The optimal derivation condition was established. The fluorescence intensity was detected at excitation wavelength of 321 nm, and emission wavelength of 384 nm.

RESULT: A linear relationship was obtained between the fluorescence intensity and the addition of reference substance in the range of 0.999 7-17.99 nmol with a correlation coeffient of 0.999 9, and the average recovery was 102.3% with RSD 4.6%.

CONCLUSION

This method is simple and sensitive with quick and correct result. It can provide a reference for the determination of sulfur dioxide residues in traditional Chinese medicine.