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)合物的吸光度與氨氮含量成正比，于波長(cháng)420nm處測量吸光度。經(jīng)過(guò)微電腦芯片計算后直接顯示氨氮含量(mg/L)。</div><div> </div><div>　　COD氨氮快速檢測儀將經(jīng)典的比色法與*的計算機技術(shù)結合起來(lái)，應用微電腦光電子比色檢測原理取代傳統的目視比色法，消除了人為誤差，測量分辨率大大提高。實(shí)現了測定過(guò)程的自動(dòng)化。探測出水中氨氮的來(lái)源主要為生活污水中含氮有機物受微生物作用的分解產(chǎn)物，某些工業(yè)廢水，如焦化廢水和合成氨化肥廠(chǎng)廢水等，以及農田排水。此外，在無(wú)氧環(huán)境中，水中存在的亞硝酸鹽亦可受微生物作用，還原為氨。在有氧環(huán)境中，水中氨亦可轉變?yōu)閬喯跛猁}，甚至繼續轉變?yōu)橄跛猁}。<br /> </div><div>　　COD氨氮快速檢測儀注意事項</div><div>　　1、實(shí)驗之前應對主機進(jìn)行預熱。</div><div>　　2、實(shí)驗用過(guò)的COD試管，無(wú)須用洗滌劑沖洗，一般先用自來(lái)水后用蒸餾水沖洗烘干備用，以防洗滌劑粘附在內壁，影響到測定結果。</div><div>　　3、反應液倒入比色皿后，有細小汽泡上浮，影響數顯波動(dòng)，當數字穩定后再讀數。</div><div>　　4、從比色皿倒溶液時(shí)，不要將溶液濺到比色皿透光的看窗上，比色測定之前，應檢查比色皿看窗是否干凈，除了目測外，可檢查每個(gè)比色皿的光密度A，測其相對值是否一致。</div><div>　　5、對于多個(gè)樣品連續測定時(shí)，將測過(guò)的比色皿中溶液從一角倒掉，用蒸餾水清洗后小心甩凈，即可倒入新的待測溶液，由此引入的誤差在允許范圍之內，為了使誤差變得更小，測定時(shí)，水樣的COD值可從小往大做。</div><div>　　6、拉動(dòng)測定儀的拉桿時(shí)，應保證被測比色皿準確對準光路。</div><p align="center"><img src="https://img78.chem17.com/9/20220419/637859650826609344903.jpg" 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