1. British Standards Institution (1971) Method for the determination of sulphur in petroleum products (Lamp method), British Standard 4350
2. Darlage LJ, Block SS, Weidner JP (1973) J Chromatogr Sci 11:272
3. Williams WJ (1979) Handbook of anion determination. Butterworths, London
4. Bogdanski SL, Townshend A, Yenigul B (1980) Anal Chim Acta 115:361
5. Bogdanski SL, Calokerinos AC, Townshend A, Internat Lab (1982) in press