pH AND CHEMISTRY OF NITROGEN, PHOSPHATE, SULFAR AND ALUMINUM IN SURFACE WATER NEAR TEA PLANTATION

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  • 茶畑周辺の池水中のpH変化と窒素、リン、硫黄、アルミニウムの挙動について
  • チャバタケ シュウヘン ノ イケ スイチュウ ノ pH ヘンカ ト チッソ リ

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Abstract

High concentrations of NO3-, SO42-, phosphate, and Al3+ and low pH values were found in spring water which originated from a tea plantation. Although acidic spring water flowed into a local pond, the pH value of the pond water remained above 7 because of photosynthesis, denitrification and sulfate reduction. Photosynthesis caused by an increase of phosphate and NO3- concentrations was concluded to have given rise to increases in pH values. Denitrification was thought to have caused the pond to eliminate NO3- annually. Sulfate reduction was thought to have caused a disappearance of SO42-. Phosphate was stored within a pond in the form of organic compounds. Al3+ was precipitated within the pond because of increases in pH values.

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