摘要
研究了用原子吸收法间接测定水中溶解氧的方法。在水样中加入ＭｎＳＯ４ 和ＮａＯＨ 溶液固定溶解氧后，加酸调溶液酸度为ｐＨ ５ ，使Ｍｎ（ＯＨ）２沉淀溶解，而ＭｎＯ（ＯＨ）２沉淀仍留在溶液中，离心分离ＭｎＯ（ＯＨ）２沉淀后，在ｐＨ１ 时加ＫＩ溶液使沉淀溶解，用ＡＡＳ法测定溶液中的Ｍｎ，通过从实验中得到的［Ｏ２］（ｍ ｇ／Ｌ）＝ １．４６［Ｍｎ］关系可间接求得溶解氧（Ｄｉｓｓｏｌｖｅｄ Ｏｘｙｇｅｎ 缩写ＤＯ）的含量。ＤＯ 的测定范围为０．４～１２ ｍ ｇ／Ｌ。用本法对各种ＤＯ 样品的测定结果与碘量法的结果完全吻合。
In this paper a new indirect AAS method for determining dissolved oxygen in aqueous samples was studied.After MnSO 4 and NaOH reagent were added to aqueous samples to react with dissolved oxygen ,the pH of the solution was adjusted to 5 to make Mn(OH) 2 dissolve and MnO(OH) 2 remained as precipitate,MnO(OH) 2 was separated by centrifuge and dissolved in KI solution of pH 1,Mn was determined by AAS and DO was calculated from the [O 2](mg/L)=1.46[Mn] relation ship obtained in experiments.The proposed method is simple,fast and accurrate ,the determination range is 0.4～12 mg/L.The results obtained by the AAS method were agreed well with those obtained by iodometry.
出处
《分析试验室》
CAS
CSCD
2000年第1期57-59,共3页
Chinese Journal of Analysis Laboratory
