【摘要】：目的建立以自動(dòng)電位滴定儀標(biāo)定碘滴定液(0.05mol·L-1)的方法。方法采用ZD-3A型自動(dòng)電位滴定儀,以213型鉑電極為指示電極,以231Q9型玻璃電極為參比電極,預(yù)設(shè)好終點(diǎn)電位,精密量取碘滴定液(0.05mol·L-1)20m L,加水100m L,調(diào)節(jié)攪拌速度,加鹽酸溶液(9→100)1m L,按"自動(dòng)滴定",快速加入硫代硫酸鈉滴定液(0.1mol·L-1)約為預(yù)計(jì)體積的85%,再自動(dòng)滴定至滴定終點(diǎn)。結(jié)果本法操作簡(jiǎn)單,滴定時(shí)間短,與中國(guó)藥典2015年版標(biāo)定方法標(biāo)定的濃度值很接近,兩者偏差不大于0.01%;連續(xù)測(cè)定3次9份滴定液濃度的RSD不超過0.07%;室溫下待測(cè)溶液在30min內(nèi)基本穩(wěn)定。結(jié)論本方法簡(jiǎn)便快速、準(zhǔn)確穩(wěn)定,可用于碘滴定液的標(biāo)定。
[Abstract]:Objective to establish a method for calibration of iodine titration solution (0.05mol 路L-1) by automatic potentiometer. Methods ZD- 3A automatic potential titrator, 213 platinum electrode as indicator electrode and 231Q9 glass electric reference electrode as reference electrode were used. The end point potential was preset. The concentration of iodine titrator (0.05mol 路L-1) was 20 mL and water was added to 100 mL. Adjust the stirring speed, add hydrochloric acid solution (9 渭 100) mL, according to "automatic titration", quickly add sodium thiosulfate titration solution (0.1mol 路L-1) to about 85% of the predicted volume, and then automatically titrate to the end point of titration. Results the method was simple in operation and short in titration time, which was close to the calibration concentration of 2015 edition of Chinese Pharmacopoeia, the deviation was less than 0.01%, and the RSD of 9 titrates was not more than 0.07%, and the concentration of titrate was less than 0.07%. The solution to be measured is basically stable in 30min at room temperature. Conclusion the method is simple, rapid, accurate and stable, and can be used for the calibration of iodine titration solution.
【作者單位】： 寧德市食品藥品檢驗(yàn)檢測(cè)中心;
【分類號(hào)】：R927.1
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本文編號(hào)：2442516