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id="aqgwbbhhdpu" class="NyNewDetail"> <div id="aqgwbbhhdpu" class="NyNewDetail_Main"> <h1 class="NyNewDetail_Name">比較成熟的COD檢測(cè)方法有哪些？</h1> <div id="aqgwbbhhdpu" class="NyNewDetail_Tips"> <span><img src="/skins/257424/images/ico04.png" />更新時(shí)間：2020-05-19</span><span><img src="/skins/257424/images/ico05.png" />點(diǎn)擊次數(shù)：2060</span> </div> <div id="aqgwbbhhdpu" class="NyNewDetail_Content" id="c_detail_wrap"> <div>　　我國(guó)對(duì)COD檢測(cè)儀方法的研究比較早,近幾年,對(duì)COD檢測(cè)儀的研究更為活躍,測(cè)試手段正不斷發(fā)展更新,方法間相互滲透,有些方法如HACH、比色法雖然仍未得以廣泛應(yīng)用,但方法已得到相關(guān)環(huán)境保護(hù)單位的認(rèn)可。目前,比較成熟的COD檢測(cè)方法主要有以下三種:即回流滴定法、微波法、HACH比色法。</div><div>　　COD檢測(cè)儀HACH比色法：</div><div>　　HACH比色法是目前少數(shù)先進(jìn)實(shí)驗(yàn)室所采用的一種測(cè)試方法,該方法采用美國(guó)HACH公司特制的瓶裝消解液為消解試劑。測(cè)試時(shí),加入水樣,在HACH公司制造的COD反應(yīng)器上加熱2h,待冷卻至室溫后用分光光度計(jì)進(jìn)行比色分析,直讀出水樣中的COD值。由于在還原劑作用下Cr2O72-部分轉(zhuǎn)化為Cr3+,在波長(zhǎng)620nm下,測(cè)其吸光度,然后由吸光度換算出COD值。</div><div>　　該方法的優(yōu)點(diǎn)是克服了滴定分析可能帶來(lái)的誤差,操作簡(jiǎn)單、方便。雖然該方法優(yōu)勢(shì)明顯,但同時(shí)存在一定的缺陷:由于消解液采用特制的瓶裝消解液,該瓶裝消解液每瓶費(fèi)用較高。</div><div>　　COD檢測(cè)儀回流滴定法：</div><div>　　此方法是目前實(shí)驗(yàn)室普遍采用的一種方法,同時(shí)也是國(guó)家標(biāo)準(zhǔn)方法。本方法適用于各類型的含COD值大于30mg/L水樣,對(duì)未經(jīng)稀釋的水樣檢測(cè)上限為700mg/L。具體方法為:在水樣中加入已知量的重鉻酸鉀溶液,并在強(qiáng)酸介質(zhì)下以硫酸銀為催化劑,經(jīng)沸騰回流后,以試亞鐵靈為指示劑,用硫酸亞鐵銨滴定水樣中未被還原的重鉻酸鉀,由消耗的硫酸亞鐵銨的量換算成消耗氧的質(zhì)量濃度。</div><div>　　該方法的缺點(diǎn)是:操作過(guò)程相對(duì)繁瑣,引起誤差的原因較多,如回流收集可能引起較大誤差,經(jīng)計(jì)算每滴硫酸亞鐵銨可帶來(lái)COD值約8mg/L的變化,可能引起較大誤差;對(duì)高氯低COD的水不適用。</div><div>　　該方法的優(yōu)點(diǎn)是:方法相對(duì)成熟,并且對(duì)儀器的要求相對(duì)較低。</div><div>　　COD檢測(cè)儀微波法：</div><div>　　微波法是近幾年發(fā)展起來(lái)的一種COD測(cè)試方法,該方法與回流法一樣采用硫酸-重鉻酸鉀消解體系,水樣經(jīng)微波加熱消解后,過(guò)量的重鉻酸鉀以試亞鐵靈為指示劑,用硫酸亞鐵銨滴定,計(jì)算出COD值。</div><div>　　該方法的一個(gè)大特點(diǎn)就是反應(yīng)液的加熱是采用頻率為2450MHz的電磁波能量來(lái)進(jìn)行的,在高頻微波的作用下,反應(yīng)液分子會(huì)產(chǎn)生摩擦運(yùn)動(dòng),另外還采用密封消解方式,使消解罐壓力迅速提高到203kPa,因此該方法的優(yōu)點(diǎn)是反應(yīng)時(shí)間短,可實(shí)現(xiàn)對(duì)高氯水的測(cè)定。</div> 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