Flow injection spectrofluorimetry with in-line Winklers procedure was developed for the dissolved oxygen (DO) determination. 2-Thionaphthol reacted with iodine produced by Winkler's method to form fluorescence inactive disulfide compound. To automate the process completely, a 5-channel flow system with a newly designed 16-way valve was assembled. The system consisted of a dispersion coil (DC), a precipitate formation coil (PFC), a precipitate dissolving coil (PDC), and extraction coil (EC). A calibration can be constructed by using a standard iodine solution for dissolved oxygen. The calibration graph was linear over the range 1.2x10(-4) approximately 6.0x10(-4)moll(-1) iodine (1.96 approximately 9.80mgOl(-1))). The relative standard deviation (n=6) was below 0.3% for the 4x10(-4)moll(-1) iodine (6.27mgOl(-1)) determination. The sample throughput was 12/h.
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