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class="clear"></div> </div> </div>   <div id="vt10j5u7oi72" class="NyNewDetail"> <div id="vt10j5u7oi72" class="NyNewDetail_Main"> <h1 class="NyNewDetail_Name">如何解決COD消解儀誤差偏大的問題？</h1> <div id="vt10j5u7oi72" class="NyNewDetail_Tips"> <span><img src="/skins/257424/images/ico04.png" />更新時間：2023-02-09</span><span><img src="/skins/257424/images/ico05.png" />點(diǎn)擊次數(shù)：957</span> </div> <div id="vt10j5u7oi72" class="NyNewDetail_Content" id="c_detail_wrap"> <div> COD消解儀遵循了國際標(biāo)準(zhǔn)(ISO)和國家標(biāo)準(zhǔn)(GB)的基本原理，確保了回流加熱微沸2小時的消解實(shí)際操作，試劑溶液的配制和加入量都與國家環(huán)境保護(hù)部(HJ828-2017)重鉻酸鹽法相一致，確保了可靠精確的剖析結(jié)果。</div><div>　　cod消解儀測量過程中，出現(xiàn)，誤差偏大，重復(fù)性不好。測量結(jié)果出現(xiàn)負(fù)值等現(xiàn)象。</div><div>　　解決方法，這些現(xiàn)象大部分并不是由儀器引起的，主要是由于操作引起的。為方便廣大用戶解決上述問題，將操作技巧及方法作一下總結(jié)，</div><div>　　比色管的方向，比色管插入比色孔時一定保證比色管上的白色橢圓標(biāo)簽面對操作者方向。測量前仔細(xì)擦拭比色管外部，消解完放置1-2分鐘，是否用水沖洗比色管均要用干濾紙或紙巾仔細(xì)擦拭試管外部。</div><div>　　比色管引起的誤差。磨損程度較大的比色管會產(chǎn)生最大±15 mg/L的絕對誤差，較新管最大有±5 mg/L的絕對誤差。在低COD值測定過程中(小于20mg/L)，比色管可能引起較大誤差。</div><div>　　解決方法是，將全部比色管用蒸餾水洗凈內(nèi)部，分別裝入5mL蒸餾水，仔細(xì)擦拭外部后，任取一只作為空白，COD值記為0，再測量其他比色管的COD值并進(jìn)行比較。將測量值之差小于±5 mg/L的挑選出來，編為一組，每次測量時用同一組試管，這樣可以減小誤差。在水樣冷卻過程中沉淀產(chǎn)生也嚴(yán)重影響測量結(jié)果。</div><div>　　不急于測量時，消解完后取出比色管放置1-2分鐘，先用濕濾紙再干濾紙仔細(xì)擦拭試管外部。然后靜止放置(勿搖晃)一到兩個小時再測量，可以取得較精確的結(jié)果。</div><div>　　急于測量時，可在消解完后取出比色管空冷1分鐘，再用冷水沖2分鐘左右，用濾紙擦拭干凈后立即測量，5分鐘之內(nèi)完成測量，也可取得較好效果。試劑加入的操作。</div><div>　　在水樣中加入試劑1號充分搖勻再加入試劑2號和3號。3號一定要垂直加入不要沿壁流入水樣中。搖勻后即可消解。如果氯離子含量低時，可不加1號，并單獨(dú)做一條低量程曲線，這樣重復(fù)性更好。</div> </div> <div id="vt10j5u7oi72" class="NyPro_PrevNext"> <p class="NyProPrev"><img src="/skins/257424/images/jt10.png" />上一個：<a href="/jsshengaohua-Article-3265382/">實(shí)驗室如何優(yōu)雅地打開各種瓶蓋？</a></p> <a href="/article.html" class="NyProAll"><img src="/skins/257424/images/ProAll.png" />返回列表</a> <p class="NyProNext">下一個：<a href="/jsshengaohua-Article-3237464/">便攜式COD測定儀常見的幾種檢測方法介紹</a><img src="/skins/257424/images/jt11.png" /></p> <div id="vt10j5u7oi72" 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