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- W804910457 abstract "Seasonal variations of the contents of some chemical constituents of the estuary water at two definite stations of the laver bed in Nack Dong River have been determined over one tidal cycle in spring tide from Nov. 1962 to Oct. 1963. The ranges of annual variations of the contents at station 1 and station 2 are as follows: water temp. , ; pH 7.8-8.5, 7.9-8.4; chlorosity 0.025-19.66 g/l, 4.31-19.56 g/l; magnesium 0.00355-1.565 g/l, -1.524 g/l; calcium 0.00557-0.482 g/l, - -0.590 g/l; saturation % of dissolved oxygen 71.8-123.2%, 88.2-113.8%; silicate-Si 8.00-125.5 g-at./l, 6.70-100.5 g-at./l; phosphate-P 0.12-1.47 g-at./l, 0.11-1.09 g-at./l; ammonia-N 4.88-25.45 g-at./l, 4.12-17.58 g-at./l; nitrite-N 0.07-0.75 g-at./l, 0.08-0.58 g-at./l; nitrate-N 2.11-6.89 g-at./l, 1.85-7.43 g-at./l each. The annual tidal variations of the constituents at station 1 are more remarkable than of station 2. The chlorosity, magnesium and calcium contents are decreased nearing the slack after ebb, and increased abruptly then one hour after the slack. The contents of the other constituents are varied according to the chlorosity variety. The values of pH, chlorosity, magnesium and calcium contents are lower in summer than winter, while the difference of seasonal variations of the % saturation of dissolved oxygen is not remarkable. The phosphate-P and total nitrogen contents have a tendency of increasing within a definite range, while the silicate-Si increase proportionally, to the increasing of mixing percentage of fresh water. The average values of Si/P and N/P are several times greater than of the normal in sea water. The chemical composition considered from the value of Mg/Cl or Ca/Cl of estuarine water varies according to the variety of chlorosity, even at the high chlorosity of 19 g/l." @default.
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- W804910457 date "1964-01-01" @default.
- W804910457 modified "2023-09-23" @default.
- W804910457 title "Seasonal Variations of Chemical Composition of the Estuary Water at the Tidal Flat in Nack Dong River from Nov. 1962 to Oct. 1963" @default.
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