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本標(biāo)準(zhǔn)適用于各種類(lèi)型的含</span></span><span style="font-size:10.5pt"><span style="font-family:宋體">COD</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">（</span></span></strong><strong><span style="font-size:10.5pt"><span style="font-family:calibri">COD</span></span></strong><strong><span style="font-size:10.5pt"><span style="font-family:宋體">在線(xiàn)監(jiān)測(cè)儀</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">）</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">值大于30 mg/L的水樣，對(duì)未經(jīng)稀釋的水樣的測(cè)定上限為 700mg/L。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 本標(biāo)準(zhǔn)不適用于含氯化物濃度大于1000mg/L(稀釋后)的含鹽水。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">定義 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 在一定條件下，經(jīng)重鉻酸鉀氧化處理時(shí)，水樣中的洛解性物質(zhì)和懸浮物所消耗的重鉻酸鹽相對(duì)應(yīng)的氧的質(zhì)量濃度。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">原理 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 在水樣中加入己知量的重鉻酸鉀溶液，并在強(qiáng)酸介質(zhì)下以銀鹽作催化劑，經(jīng)沸騰回流后，以試亞鐵靈為指示劑，用硫酸亞鐵按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。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 在酸性重鉻酸鉀條件下，芳烴及吡啶難以被氧化，其氧化率較低。在硫酸銀催化作用下，直鏈脂肪族化合物可有效地被氧化。 </span></span></p> </div> <div id="35hf15jpnp" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-2082513/">總氮的水樣</a></li> <li>下一篇：<a href="/szhcy-Article-2080074/">溶解氧（DO）水質(zhì)自動(dòng)分析儀技術(shù)術(shù)語(yǔ)和定義</a></li> </ul> </div> </div>   <div id="35hf15jpnp" class="foot_box"> <div id="35hf15jpnp" class="foot_t"> <div id="35hf15jpnp" class="w1200"> <a href="/">網(wǎng)站首頁(yè)</a>　|　<a href="/aboutus.html">關(guān)于我們</a>　|　<a href="/products.html">產(chǎn)品中心</a>　|　<a 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