Yamagata, M., & Low, L. K. (1992). Analysis of additives: Determination of sulphur dioxide (residual SO2) by Rankine method A?: Alkali titration method. In H. Hasegawa & K. Miwa (Eds.), Laboratory Manual on Analytical Methods and Procedures for Fish and Fish Products (2nd ed., pp. D-9.1-D-9.5). Singapore: Marine Fisheries Research Department, Southeast Asian Fisheries Development Center.