碘量法测定硼氢根浓度及主要影响因素
收稿日期: 2020-01-22
网络出版日期: 2020-07-13
基金资助
河南省重点科技攻关计划项目(132102210068)
Determination of BH4- concentration by iodometry and main influencing factors
Received date: 2020-01-22
Online published: 2020-07-13
吴冰 . 碘量法测定硼氢根浓度及主要影响因素[J]. 无机盐工业, 2020 , 52(7) : 77 -81 . DOI: 10.11962/1006-4990.2019-0440
Iodometry was proposed to determine BH4- concentration in the solution corresponding to the difficulties in precision detection of sodium borohydride during its industrial applications.Orthogonal testes were carried out to optimize the titration parameters,and the optimal conditions were obtained as follows: solution acidity was 0.06 mol/L,KI addition amount was three times theoretical value,water-sealing holding time was 5~10 min and indicator amount was 2 mL.Significances of varied influencing factors were in descending order: solution acidity,indicator addition amount,KI addition amount and water-sealing holding time.Optimization experiment was conducted under optimal conditions,and the results showed that the recovery rates were nearly 100% and the relative standard deviations were approximately 0.3% during the titration process.
Key words： sodium borohydride; iodometry; titration; analysis
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