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id="g0wa2gs2c" class="panel-bd"> <div id="g0wa2gs2c" class="news-detail news-aggregate-detail"> <div id="g0wa2gs2c" class="news-detail-title"> <h1>為什么要經(jīng)常檢測COD和BOD這兩個指標(biāo)?</h1> <p> <span>瀏覽量：1050</span>  <span>發(fā)布時間：2022-03-04 11:32:11</span> </p> </div> <div id="g0wa2gs2c" class="news-detail-view"> <p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">廢水之主要是由于COD、BOD這些指數(shù)的含量高，但廢水中往往含有幾十種甚至上百種有機(jī)物。相信許多用戶對BOD測定儀和COD測定儀的區(qū)別都有很多疑問，那么在水質(zhì)檢測中，為什么要經(jīng)常檢測COD和BOD這兩個指標(biāo)?</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;"><br/></span></p><p style="text-align: center; line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;"><img src="/Public/Uploads/image/20220304/1646364656950349.jpg" title="1646364656950349.jpg" alt="水質(zhì)文章.jpg" width="446" height="401" style="width: 446px; height: 401px;"/></span></p><p style="line-height: 1.75em;"><strong><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;"><br/></span></strong></p><p style="line-height: 1.75em;"><strong><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">什么叫COD(化學(xué)需氧量)?</span></strong></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">▼化學(xué)需氧量(COD)是指廢水中能被氧化的物質(zhì)在被化學(xué)氧化劑氧化時，所需要的氧量，以氧的毫克/升作為單位。它是目前用來測定廢水中有機(jī)物含量的一種常用的手段。COD分析中常用的氧化劑有高錳酸鉀(錳法CODMn)和重鉻酸鉀(鉻法CODCr)，現(xiàn)在常用重鉻酸鉀法。</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">廢水在強(qiáng)酸加熱沸騰回流條件下對有機(jī)物實行氧化，用硫酸銀作催化劑時可以使大多數(shù)的有機(jī)物的氧化率提高到85-95%。如果廢水中含有較高濃度的氯根離子，應(yīng)該用硫酸汞將氯離子屏蔽掉，以減少對COD的測定干擾。</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;"><br/></span></p><p style="line-height: 1.75em;"><strong><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">什么叫BOD5(生化需氧量)?</span></strong></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●生化需氧量也可以表征廢水被有機(jī)物污染的程度，常用的為五日生化需氧量，以BOD5表示，它表示廢水在微生物存在下進(jìn)行生化降解五日內(nèi)所需要的氧的數(shù)量。今后我們將經(jīng)常使用五日生化需氧量。</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">COD并不是單單表示水中的有機(jī)物質(zhì)的，它還能表示水中具有還原性質(zhì)的無機(jī)物質(zhì)，如：硫化物、亞鐵離子、亞硫酸鈉，甚至氯根離子等。譬如講，如果鐵炭池出水中的亞鐵離子在中和池中沒能完全被去除掉的話，則生化處理出水中由于有亞鐵離子的存在，出水COD可能會超標(biāo)。</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;"><br/></span></p><p style="line-height: 1.75em; text-align: center;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;"><img src="http:///Public/Uploads/image/20220304/1646364683505714.jpg" title="1646364683505714.jpg" alt="YSI ProOBOD.jpg" style="color: rgb(51, 51, 51); font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px; text-align: center; white-space: normal;"/></span></p><p style="line-height: 1.75em;"><br/></p><p style="line-height: 1.75em;"><a href="http:///list-1-107-0.html" target="_self" title="BOD測試儀"><strong><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">BOD測試儀</span></strong></a><strong><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">推薦：</span></strong></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">美國YSI ProOBOD測定儀廣泛應(yīng)用于水環(huán)境常規(guī)測量和應(yīng)急測量、污水處理的溶解氧測量、高校和科研機(jī)構(gòu)的教學(xué)和研究、水族館、水產(chǎn)養(yǎng)殖業(yè)的水質(zhì)測量、生態(tài)環(huán)境調(diào)查以及其它領(lǐng)域內(nèi)的溶解氧測量。</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">產(chǎn)品特性：</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">● 測量范圍(0-500%)較其它品牌光學(xué)溶解氧傳感器更寬廣;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●智能數(shù)字傳感器技術(shù)能將校準(zhǔn)數(shù)據(jù)存儲在傳感器中，探頭即使安裝在任一沒有校準(zhǔn)過的ProODO 主機(jī)上，也可正常運行;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●適配300毫升BOD瓶;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●用戶可在野外自行更換傳感器;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●IP67防水等級，電池倉與儀器電路倉各自獨立分隔并密封，即使電池倉進(jìn)水也不影響或損壞儀器電路;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●外敷橡膠的防滑澆注外殼，抓握更容易，使用壽命更長;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●存儲2000組數(shù)據(jù)(含傳感器數(shù)據(jù)、日期、時間、站點和用戶自定義信息)</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●借助標(biāo)配的USB線連接ProPlus主機(jī)和計算機(jī)，不僅能為主機(jī)供電，亦可運用易于操作的 Data Manager軟件設(shè)置主機(jī)、管理分析數(shù)據(jù)以及查看圖形數(shù)據(jù)與表格數(shù)據(jù);</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●兩種測量模式：自動/手動采樣模式/連續(xù)實時測量模式;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●夜光鍵盤和背景光顯示屏便于在昏暗環(huán)境下操作;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●用戶可自選電纜長度，很長可達(dá)100米;電纜整理套件幫助整理4米或更長的電纜;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●MS軍方接頭，快速插拔，防水，連接可靠穩(wěn)固;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●接頭的電纜部分可耐受30萬次彎折，經(jīng)久耐用;</span></p><p style="line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">●內(nèi)置氣壓計;</span></p><p><br/></p><p style="line-height: 1.75em;"><a href="http:///list-1-155-0.html" target="_self" title="COD測試儀" textvalue="COD測試儀"><span style="color: rgb(0, 112, 192);"><strong><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px; color: rgb(51, 51, 51);">COD測試儀</span></strong></span></a><span style="color: rgb(0, 112, 192);"><strong><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px; color: rgb(51, 51, 51);">推薦：</span></strong></span></p><p style="line-height: 1.75em;"><font face="微軟雅黑, Microsoft YaHei"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">雷磁</span></font><span style="color: rgb(51, 51, 51); font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">COD-572型化學(xué)需氧量測定儀是采用庫侖滴定的方法進(jìn)行測量。不僅可以測定CODCr，也可以測定CODMn(也稱高錳酸鹽指數(shù))。</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", 微軟雅黑; font-size: 14px; white-space: normal; line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">基于庫侖滴定法進(jìn)行測定，操作簡便、快速，試劑用量少。適合COD含量較低的地表水樣品中CODCr的測定，以及自來水等樣品中CODMn的測定。</span></p><p style="line-height: 1.75em;"><span style="color: rgb(51, 51, 51); font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;"></span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", 微軟雅黑; font-size: 14px; white-space: normal; line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei";">具有數(shù)據(jù)管理功能，可貯存錳法和鉻法各200個COD測量值，以及錳法和鉻法各10種不同標(biāo)樣體積的COD標(biāo)定值，便于用戶調(diào)用;</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 51); font-family: "Microsoft YaHei", 微軟雅黑; font-size: 14px; white-space: normal; line-height: 1.75em;"><span style="font-family: 微軟雅黑, "Microsoft YaHei"; font-size: 14px;">采用庫倫滴定法;</span></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; color: rgb(51, 51, 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