發(fā)布時間：2018-05-06 15:30

  本文選題：玻碳電極 + 薄層電解池��； 參考：《齊齊哈爾大學(xué)》2012年碩士論文

【摘要】：以玻碳汞膜電極作為工作電極的陽極溶出伏安法由于靈敏度高，線性范圍寬，檢測速度快而成為微量分析的重要手段，但該方法仍存在峰高測量重現(xiàn)性差等不足。一般測量血鉛時要求對血樣進行稀釋100倍，以減小或消除蛋白質(zhì)對鉛原子溶出過程的干擾，這樣無形中對檢測限提出了更高的要求。血鉛峰高與空白峰高接近，影響定量。玻碳汞膜電極和電解池是該方法設(shè)備的核心部分。溶出時的噪音寬Wn與電極面積A成正比，鉛的溶出峰高Hp也與電極面積A成正比。提高信噪比Rsn才是降低方法檢測限的有效方法。本文將血液稀釋10倍，在流動薄層池內(nèi)，鉛離子首先在大面積玻碳汞膜電極（LGCE）上預(yù)富集，溶出后在小面積玻碳汞膜電極（SGCE）上二次富集，因此提升了SGCE富集時溶出曲線的峰高，電解池內(nèi)沒有血液成分，只有血鉛稀釋劑，有利于鉛的溶出，降低檢測限。血液稀釋倍數(shù)降低，，鉛離子在血液中的的濃度相對較高，可以提高血鉛峰高與空白峰高的比值。 本文采用薄層大面積玻碳電解池與小面積玻碳電解池以串聯(lián)方式連接。鉛離子首先在大面積玻碳汞膜電極（LGCE）上被預(yù)富集，溶出后在小面積玻碳汞膜電極（SGCE）上二次富集鉛，因此提升了SGCE富集時的鉛離子濃度，減小電極的面積也有利于提高信噪比Rsn。
[Abstract]:Anodic stripping voltammetry with glassy carbon mercury film electrode as working electrode has become an important method for trace analysis because of its high sensitivity wide linear range and high detection speed. However the method still has some shortcomings such as poor reproducibility of peak height measurement. In order to reduce or eliminate the interference of protein on the dissolution process of lead atoms, it is required to dilute the blood sample 100 times when measuring blood lead. The peak height of blood lead was close to that of blank peak, which affected the quantification. Glassy carbon mercury film electrode and electrolytic cell are the core of the equipment. The noise width W _ n is proportional to the electrode area A, and the peak height HP is proportional to the electrode area A. Improving signal-to-noise ratio (Rsn) is an effective method to reduce the detection limit. In this paper, the hemodilution is 10 times. In the flow thin-layer cell, lead ion is preenriched on the large area glassy carbon mercury membrane electrode (LGCE), and then reenriched on the small area glassy carbon mercury membrane electrode. Therefore, the peak height of the dissolution curve during the enrichment of SGCE is raised. There is no blood component in the electrolytic cell, only blood lead diluent, which is advantageous to the dissolution of lead and lower detection limit. The ratio of blood lead peak height to blank peak height can be increased because of the decrease of hemodilution multiple and the relatively high concentration of lead ion in blood. In this paper, thin layer large area glassy carbon electrolysis cell and small area glassy carbon electrolysis cell are connected in series. Lead ion was preenriched on large area glassy carbon mercury membrane electrode (LGCE), and then reenriched on small area glassy carbon mercury membrane electrode (SGCE) after dissolution. Therefore, the lead ion concentration during SGCE enrichment was increased, and the reduction of electrode area was also beneficial to the improvement of signal-to-noise ratio (SNR).
【學(xué)位授予單位】：齊齊哈爾大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：R131;O657.1

【參考文獻】

相關(guān)期刊論文 前10條

1 孫元喜;周谷珍;戴文娟;;化妝品中微量毒害元素鉛、鎘的差分脈沖溶出伏安法分析[J];湖南文理學(xué)院學(xué)報(自然科學(xué)版);2006年03期

2 李世慶;;溶出伏安法在環(huán)境及生物樣品分析中應(yīng)用的進展[J];重慶環(huán)境科學(xué);1990年04期

3 陳少卿;鄭明波;王霞;彭宗仁;;電極材料對高密度聚乙烯中空間電荷的影響[J];電工技術(shù)學(xué)報;2011年01期

4 張丹,艾洪武,劉秀珍,張光萍;武漢地區(qū)5031例門診兒童血鉛水平分析[J];中國兒童保健雜志;2005年04期

5 湯永飛;李艷;李鋒;汪明;李從榮;郭靜芳;趙日紅;;網(wǎng)織紅細(xì)胞血紅蛋白含量檢測篩查鉛中毒的意義[J];中國兒童保健雜志;2009年02期

6 高敬文;韓靜楓;李華;;兒童血鉛檢測情況比較分析[J];中國兒童保健雜志;2009年02期

7 孫微,王磊,李一峻,何錫文;電化學(xué)分析方法在元素形態(tài)分析中的應(yīng)用[J];分析化學(xué);2004年04期

8 軒衛(wèi)華;曹紅;龔曉武;李炳奇;劉紅;;槲皮素在懸汞電極上的伏安行為研究[J];分析試驗室;2010年11期

9 趙宏;;分析儀器聯(lián)用技術(shù)的發(fā)展動向[J];干旱環(huán)境監(jiān)測;2006年03期

10 李軍;汪模輝;陳文;;鎘、鉛、鉻、銅的電化學(xué)分析[J];廣東微量元素科學(xué);2006年07期

本文編號：1852856