發(fā)布時間：2018-01-11 13:22

  本文關(guān)鍵詞：自動電位滴定儀應(yīng)用于測定海洋沉積物中有機碳的可行性研究　出處：《巖礦測試》2016年04期 　論文類型：期刊論文

  更多相關(guān)文章： 海洋沉積物 有機碳 自動電位滴定儀 滴定終點判定 氧化還原電位

【摘要】：自動電位滴定儀具有操作簡便、測定速度快的優(yōu)勢,減少了人為操作的影響,本文使用自動電位滴定儀測定海洋沉積物中有機碳的含量,并與國家標(biāo)準(zhǔn)(GB 17378.5—2007)中根據(jù)滴定過程中溶液顏色變化用肉眼判定滴定終點的方法進行了對比分析,確定通過儀器自動判斷滴定終點實現(xiàn)準(zhǔn)確測定的可行性。結(jié)果表明:自動電位滴定的方法檢出限為0.029%,人工肉眼判定終點的方法檢出限為0.086%,在滴定終點判定方面兩種方法無顯著性差異,但自動電位滴定儀的準(zhǔn)確度和精密度更優(yōu),在一定程度上可代替肉眼判定滴定終點。實際應(yīng)用過程中也發(fā)現(xiàn),當(dāng)?shù)味ǖ娜芤后w系由于氧化還原反應(yīng)、絡(luò)合作用等影響因素使電位變化較為復(fù)雜時,自動電位滴定儀有可能會得到多個等當(dāng)點而無法判斷哪個等當(dāng)點是真正的目標(biāo)等當(dāng)點,此時需要利用肉眼進行輔助確定。
[Abstract]:The automatic potentiometric titrator has the advantages of simple operation and rapid determination, and reduces the influence of artificial operation. In this paper, the content of organic carbon in marine sediments is determined by automatic potentiometric titration. It is compared with the national standard GB 17378.5-2007 that the titration end point can be determined by naked eye according to the color change of the solution during titration. The feasibility of realizing accurate determination of titration end point by means of the instrument is determined. The result shows that the detection limit of automatic potentiometric titration is 0.029%. The detection limit of artificial eye was 0.086. There was no significant difference between the two methods in titration endpoint, but the accuracy and precision of automatic potentiometric titrator were better. The titration endpoints can be determined by replacing the naked eye to some extent. In the practical application, it is also found that the potential changes are more complicated when the titration solution system is affected by the redox reaction and complexation. It is possible that the automatic potentiometric titrator can obtain multiple isochronous points and can not determine which isochronous point is the real target isochronous point which needs to be determined with the aid of the naked eye.
【作者單位】： 國家海洋局第一海洋研究所;
【基金】：中央級公益性科研院所基本科研業(yè)務(wù)費專項資金(2013G11,2011T10) 青島市創(chuàng)新人才資金(13-CX-20) 山東省泰山學(xué)者海外特聘人才項目
【分類號】：P736.4;O657.1
【正文快照】： 目前,全球碳循環(huán)的研究已經(jīng)成為國際地學(xué)的主要研究課題。海洋作為地球系統(tǒng)中除巖石圈以外最大碳庫,碳儲量高達38×1012噸[1]。海洋中有機碳是全球碳循環(huán)的重要組成部分,是衡量水體中有機污染程度的一項綜合指標(biāo)[2],對它的研究可以指導(dǎo)維持海洋生產(chǎn)力開發(fā)和海洋環(huán)境保護的平衡，

本文編號：1409697