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</div> </div>   <div id="aqgwbbhhdpu" class="NyNewDetail"> <div id="aqgwbbhhdpu" class="NyNewDetail_Main"> <h1 class="NyNewDetail_Name">比較成熟的COD檢測方法有哪些？</h1> <div id="aqgwbbhhdpu" class="NyNewDetail_Tips"> <span><img src="/skins/257424/images/ico04.png" />更新時間：2020-05-19</span><span><img src="/skins/257424/images/ico05.png" />點擊次數(shù)：2157</span> </div> <div id="aqgwbbhhdpu" class="NyNewDetail_Content" id="c_detail_wrap"> <div>　　我國對COD檢測儀方法的研究比較早,近幾年,對COD檢測儀的研究更為活躍,測試手段正不斷發(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)境保護單位的認可。目前,比較成熟的COD檢測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檢測儀HACH比色法：</div><div>　　HACH比色法是目前少數(shù)先進實驗室所采用的一種測試方法,該方法采用美國HACH公司特制的瓶裝消解液為消解試劑。測試時,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進行比色分析,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620nm下,測其吸光度,然后由吸光度換算出COD值。</div><div>　　該方法的優(yōu)點是克服了滴定分析可能帶來的誤差,操作簡單、方便。雖然該方法優(yōu)勢明顯,但同時存在一定的缺陷:由于消解液采用特制的瓶裝消解液,該瓶裝消解液每瓶費用較高。</div><div>　　COD檢測儀回流滴定法：</div><div>　　此方法是目前實驗室普遍采用的一種方法,同時也是國家標(biāo)準方法。本方法適用于各類型的含COD值大于30mg/L水樣,對未經(jīng)稀釋的水樣檢測上限為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>　　該方法的缺點是:操作過程相對繁瑣,引起誤差的原因較多,如回流收集可能引起較大誤差,經(jīng)計算每滴硫酸亞鐵銨可帶來COD值約8mg/L的變化,可能引起較大誤差;對高氯低COD的水不適用。</div><div>　　該方法的優(yōu)點是:方法相對成熟,并且對儀器的要求相對較低。</div><div>　　COD檢測儀微波法：</div><div>　　微波法是近幾年發(fā)展起來的一種COD測試方法,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,過量的重鉻酸鉀以試亞鐵靈為指示劑,用硫酸亞鐵銨滴定,計算出COD值。</div><div>　　該方法的一個大特點就是反應(yīng)液的加熱是采用頻率為2450MHz的電磁波能量來進行的,在高頻微波的作用下,反應(yīng)液分子會產(chǎn)生摩擦運動,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)點是反應(yīng)時間短,可實現(xiàn)對高氯水的測定。</div> 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