Distribution of both dissolved and particulate vitamin B
12 and thiamine, and dissolved biotin in the water of Harima-Nada Sea were determined by microbiological assay methods between 1978 and 1981, and the regulatory influences on the distribution of these vitamins in the region were discussed.
The ranges in dissolved vitamin B
12, thiamine, and biotin were 1.38-25.0 ng/
l, 3.40-2140 ng/
l, and 1.51-33.2 ng/
l, respectively. The levels of particulate vitamin B
12 and thiamine were 1.60-20.1 ng/
l and 2.40-175 ng/
l, respectively. These were generally greater in the northern part, where industrial and domestic wastes were loaded, than in the southern part. The contents of both dissolved and particulate vitamins in Harima-Nada Sea were found to be generally comparable to the other eutrophied coastal waters.
Both particulate vitamin B
12 and thiamine, and dissolved biotin were significantly greater in the summer than in the winter in the offshore stations. The level of particulate vitamin B
12 was far above that of dissolved vitamin B
12 in almost all the samples in the summer but not in the winter. No significant difference could be found between the summer levels of dissolved vitamin B
12 or thiamine and its winter levels.
It was suggested that the levels of both the dissolved and the particulate vitamins in eutrophied sea waters, such as Harima-Nada Sea, may be closely connected with the growth of phytoplankters and that they may be affected significantly by the discharge of various kind of waste waters.
抄録全体を表示