内湾に発生する貧酸素水中のリンのヘテロポリブルー法による吸光光度定量

概要

論文の詳細を見る
In the Spectrophotometric determination of dissolvedorganic phosphorus in sea water by the heteropoly-blue method, the dissolved organic phosphorus is usually oxidised into inorganic phosphate by potassium persulfate prior to the determination. However, for the oxidation of the dissolved organic phosphorus in anoxic waters occurring in the lake Hamana, it was confirmed in our experiments that the potassium persulfate method was not effective because of a reducing atomosphere in the anoxic waters. In the present work, following procedure by the use of a mixture of cone. HNO_3 and HClO_4 which is a stroger oxidising reagent than the above was established for the preliminary oxidation and the determination of the dissolved organic phosphorus under such conditions was made as follows. Twenty ml of a sample solution is heated with each five ml of cone, nitric and cone, perchloric acid on a hot plate until dryness. After cooling to room temperature, ten ml of water and one ml of 5 N sulfuric acid is added and residue is dissolved. The solution is transferred into a 25 ml volumetric flask with water, and the blue color of phosphorus-heteropoly blue is developed by addition of 4 ml the color-producing solution containing ammonium molybdate, ascorbic acid, and some others. The absorbance is measured at 867 nm using a 5 cm cell. The proposed method is particularly applied for to determination of microamounts of phosphorus (P〓 1 ppb) in the anoxic waters occurring in bay.
社団法人日本分析化学会の論文
1982-09-05

内湾に発生する貧酸素水中のリンのヘテロポリブルー法による吸光光度定量

スポンサーリンク

概要

著者

関連論文

スポンサーリンク