發(fā)布時(shí)間：2018-01-11 13:22

  本文關(guān)鍵詞：自動(dòng)電位滴定儀應(yīng)用于測定海洋沉積物中有機(jī)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(jī)碳 自動(dòng)電位滴定儀 滴定終點(diǎn)判定 氧化還原電位

【摘要】：自動(dòng)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(dòng)電位滴定儀測定海洋沉積物中有機(jī)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(diǎn)的方法進(jìn)行了對(duì)比分析,確定通過儀器自動(dòng)判斷滴定終點(diǎn)實(shí)現(xiàn)準(zhǔn)確測定的可行性。結(jié)果表明:自動(dòng)電位滴定的方法檢出限為0.029%,人工肉眼判定終點(diǎn)的方法檢出限為0.086%,在滴定終點(diǎn)判定方面兩種方法無顯著性差異,但自動(dòng)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(diǎn)。實(shí)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(shí),自動(dòng)電位滴定儀有可能會(huì)得到多個(gè)等當(dāng)點(diǎn)而無法判斷哪個(gè)等當(dāng)點(diǎn)是真正的目標(biāo)等當(dāng)點(diǎn),此時(shí)需要利用肉眼進(jìn)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(jí)公益性科研院所基本科研業(yè)務(wù)費(fèi)專項(xiàng)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(xiàng)目
【分類號(hào)】：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(chǔ)量高達(dá)38×1012噸[1]。海洋中有機(jī)碳是全球碳循環(huán)的重要組成部分,是衡量水體中有機(jī)污染程度的一項(xiàng)綜合指標(biāo)[2],對(duì)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(hù)的平衡，

本文編號(hào)：1409697