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ORP測定儀是測定水質(zhì)監(jiān)測中氧化還原電位（ORP）、計(jì)算機(jī)數(shù)據(jù)采集和控制的必須部件，ORP作為介質(zhì)（包括土壤、天然水、培養(yǎng)基等）環(huán)境條件的一個綜合性指標(biāo)，已沿用很久，它表征介質(zhì)氧化性或還原性的相對程度。<div>　　ORP測定儀由鉑電極、飽和甘泵電極、一個不銹鋼第三電極（地電極）、測定系統(tǒng)組成。在輸入電位范圍為-1999mV至1999mV.如果要進(jìn)行上下限硬件控制時，還需要配置一個智能表。廣泛應(yīng)用于火電、化工化肥、冶金、環(huán)保、制藥、生化、食品和自來水等溶液中電位值的連續(xù)監(jiān)測。</div><div>　　介紹ORP測定儀的幾個應(yīng)用領(lǐng)域：</div><div>　?。?）工業(yè)污水處理</div><div>　　使用於水處理上的氧化還原系統(tǒng)，主要是鉻酸的還原與的氧化。廢水中如果添加二硫化鈉或二氧化硫可使六價的鉻離子變成三價的鉻子。若添加氯或次氯酸鈉可用來氧化，隨後是的水解，形成氰酸鹽。這種化學(xué)反應(yīng)過程叫氧化還原反應(yīng)系統(tǒng)。氧化還原電位就是電子活性的測量，這與測量氫離子活性的辦法很相似。</div><div>　?。?）水的消毒與應(yīng)用</div><div>　　氧化還原電極能衡量對游泳池水、礦泉水及自來水的消毒效果。因爲(wèi)水中大腸菌的殺菌效果受到氧化還原電位影響，所以氧化還原電位是水質(zhì)的可靠指標(biāo)。如果池水和礦泉水中的氧化還原電位值等於或高於650mv,則表示其中的含菌量是可以接受的。</div><div>　?。?）觀察土壤中ORP的動態(tài)變化等</div><div>　　例如水稻土灌水種稻以後，土壤的氧化還原狀況發(fā)生了劇烈的變化。有一種水稻土從耕作層看，灌水前一般維持在450-650mV.灌水後ORP迅速下降，到了有機(jī)質(zhì)旺盛分解期ORP下降到負(fù)200mV至100mV,施用多量新鮮綠肥時，甚至可降到負(fù)300mV.以後又回升，一般維持在0-200mV.水稻收獲前，土壤落干，ORP又回升到450mV以上</div><div>　?。?）其他領(lǐng)域的應(yīng)用</div><div>　　海洋勘探、生物工程、環(huán)境保護(hù)、釀酒工業(yè)等國民經(jīng)濟(jì)各部門都得到了廣泛的應(yīng)用。</div> 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