COD測(cè)定儀的各種檢測(cè)方法優(yōu)缺點(diǎn)有哪些？-河南綏凈環(huán)?？萍加邢薰?/title> <link rel="stylesheet" type="text/css" href="/skins/425871/css/style.css"> <link rel="stylesheet" type="text/css" href="/skins/425871/css/swiper-bundle.min.css"> <script type="text/javascript" src="/skins/425871/js/jquery.min.js"></script> <link rel="shortcut icon" href="/Skins/425871/favicon.ico" />  <script type="text/javascript"> document.addEventListener("touchstart", function () { }, true); </script>  <script language="javascript" type="text/javascript"> var nav= '5'; </script>  <script type="application/ld+json"> { "@context": "https://ziyuan.baidu.com/contexts/cambrian.jsonld", "@id": "http://www.mdeybem.cn/Article-3012094.html", "title": "COD測(cè)定儀的各種檢測(cè)方法優(yōu)缺點(diǎn)有哪些？", "pubDate": "2022-05-17T10:02:23", "upDate": "2022-05-17T10:02:23" }</script> <script language="javaScript" src="/js/JSChat.js"></script><script language="javaScript">function ChatBoxClickGXH() { 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rgb(255, 255, 255)"><span style="font-family:微軟雅黑">使用</span><span style="font-family:微軟雅黑">COD測(cè)定儀做COD測(cè)量試驗(yàn)的方法有非常多，例如快速消解法、分光光度法、COD重鉻酸鉀標(biāo)準(zhǔn)法、高錳酸鉀法、快速消解分光光度法、COD的庫侖滴定法以及COD的UV計(jì)測(cè)量方法等等。COD的這些測(cè)量方法各有各的特點(diǎn)，以下是這些COD測(cè)量法的優(yōu)缺點(diǎn)。</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:微軟雅黑">使用</span><span style="font-family:微軟雅黑">COD測(cè)定儀做COD測(cè)量試驗(yàn)的方法有非常多，例如快速消解法、分光光度法、COD重鉻酸鉀標(biāo)準(zhǔn)法、高錳酸鉀法、快速消解分光光度法、COD的庫侖滴定法以及COD的UV計(jì)測(cè)量方法等等。COD的這些測(cè)量方法各有各的特點(diǎn)，以下是這些COD測(cè)量法的優(yōu)缺點(diǎn)。</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)">　　<span style="font-family:微軟雅黑">1、快速消解法</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:微軟雅黑">　　經(jīng)典的標(biāo)準(zhǔn)方法是回流</span><span style="font-family:微軟雅黑">2h法，人們?yōu)樘岣叻治鏊俣?，提出各種快速分析方法。主要有兩種方法：</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:微軟雅黑">　　一是提高消解反應(yīng)體系中氧化劑濃度，增加硫酸酸度，提高反應(yīng)溫度，增加助催化劑等條件來提高反應(yīng)速度的方法。國(guó)內(nèi)方法以</span><span style="font-family:微軟雅黑">GB/T14420—1993《鍋爐用水和冷卻用水分析方法化學(xué)需氧量的測(cè)定重鉻酸鉀快速法》及國(guó)家環(huán)?？偩滞扑]的統(tǒng)一方法《庫侖法》和《快速密閉催化消解法（含光度法）》為該方法的代表。國(guó)外以德國(guó)標(biāo)準(zhǔn)方法DIN38049 T.43 《水的化學(xué)需氧量的測(cè)定快速法》為代表。</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:微軟雅黑">　　上述方法同經(jīng)典標(biāo)準(zhǔn)方法相比，消解體系硫酸酸度由</span><span style="font-family:微軟雅黑">9.0mg/l 提高（到10.2mg/l，反應(yīng)溫度由150℃提高到165℃，消解時(shí)間由2h 減少到10min～15min。</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:微軟雅黑">　　二是改變傳統(tǒng)的靠導(dǎo)熱輻射加熱消解的方式，而采用微波消解技術(shù)提高消解反應(yīng)速度的方法。氨氮測(cè)定儀采用國(guó)家標(biāo)準(zhǔn)：水楊酸比色法完成水質(zhì)氨氮測(cè)量，采用國(guó)際標(biāo)準(zhǔn)所規(guī)范的二氯異三氰酸鈉，取代常用次氯酸鈉，使試劑溶液含氯穩(wěn)定性和有效性大大增強(qiáng)（</span><span style="font-family:微軟雅黑">B型）由于微波爐種類繁多，功率不一，很難試驗(yàn)出統(tǒng)一功率和時(shí)間，以求達(dá)到好的消解效果。微波爐的價(jià)格也很高，較難制訂統(tǒng)一的標(biāo)準(zhǔn)方法。</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)">　　<span style="font-family:微軟雅黑">2、分光光度法</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:微軟雅黑">　　以經(jīng)典標(biāo)準(zhǔn)方法為基礎(chǔ)，重鉻酸鉀氧化有機(jī)物物質(zhì)，六價(jià)鉻生成三價(jià)鉻，通過六價(jià)鉻或三價(jià)鉻的吸光度值與水樣</span><span style="font-family:微軟雅黑">COD 值建立的關(guān)系，來測(cè)定水樣COD 值。采用上述原理，國(guó)外**主要代表方法是美國(guó)環(huán)保局EPA.Method 0410.4 《自動(dòng)手動(dòng)比色法》、美國(guó)材料與試驗(yàn)協(xié)會(huì)ASTM：D1252—2000《水的化學(xué)需氧量的測(cè)定方法B—密封消解分光光度法》和國(guó)際標(biāo)準(zhǔn)ISO15705—2002《水質(zhì)化學(xué)需氧量（COD）的測(cè)定小型密封管法》。我國(guó)是國(guó)家環(huán)?？偩纸y(tǒng)一方法《快速密閉催化消解法（含分光度法）》。</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)">　　<span style="font-family:微軟雅黑">3、COD重鉻酸鉀標(biāo)準(zhǔn)法</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)">　　<span style="font-family:微軟雅黑">COD采用重鉻酸鉀標(biāo)準(zhǔn)法測(cè)量能獲得**為準(zhǔn)確的COD值，但是COD重鉻酸鉀標(biāo)準(zhǔn)法存在很多缺點(diǎn)。COD重鉻酸鉀標(biāo)準(zhǔn)法的操作復(fù)雜，需要長(zhǎng)時(shí)間的加熱回流，且加熱回流所使用的設(shè)備體積大，難以實(shí)現(xiàn)批量測(cè)定。另外COD重鉻酸鉀標(biāo)準(zhǔn)法需要使用銀鹽，令成本較高。</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)">　　<span style="font-family:微軟雅黑">4、高錳酸鉀法</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:微軟雅黑">　　同重鉻酸鉀法一樣，高錳酸鉀發(fā)即：以高錳酸鉀作氧化劑測(cè)定</span><span style="font-family:微軟雅黑">COD，所測(cè)出來的稱為高錳酸鉀指數(shù)。氨氮測(cè)定儀依測(cè)試標(biāo)準(zhǔn)的不同，有A、B類型。其中A型采用納氏試劑比色法GB7479-87；B型采用國(guó)標(biāo)GB7148-81及國(guó)際ISO7150/1-1948所規(guī)范的水楊酸光度法為基本測(cè)試手段，輔以樣品比色反應(yīng)預(yù)處理，實(shí)現(xiàn)樣品的快速、準(zhǔn)確的比色測(cè)定，具有穩(wěn)定、靈敏、可靠以及不含汞等優(yōu)點(diǎn)。（高錳酸鉀法適合COD含量較低的情況下檢測(cè)。）</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)">　　<span style="font-family:微軟雅黑">5、快速消解分光光度法</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:微軟雅黑">　　化學(xué)需氧量測(cè)定方法無論是回流容量法、快速法還是光度法，都是以重鉻酸鉀為氧化劑，硫酸銀為催化劑，硫酸汞為氯離子的掩蔽劑，在硫酸酸性條件測(cè)定</span><span style="font-family:微軟雅黑">COD 消解體系為基礎(chǔ)的測(cè)定方法。</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)">　　<span style="font-family:微軟雅黑">6、COD測(cè)定儀庫侖滴定法</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)">　　<span style="font-family:微軟雅黑">COD的庫侖滴定法適用于飲用水、地表水、工業(yè)污水、生活廢水等各種水質(zhì)的測(cè)量，并具有較好的測(cè)量zhun確度，其測(cè)量結(jié)果與重鉻酸鉀標(biāo)準(zhǔn)法測(cè)量結(jié)果一致。COD的庫侖滴定法操作過程較為簡(jiǎn)單、測(cè)定速度快，屬于常用的一種COD測(cè)量法。</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)">　　<span style="font-family:微軟雅黑">7、COD測(cè)定儀UV計(jì)測(cè)量方法</span></span></p><p style="margin-left:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> </span></p><p style="margin-left:32px;text-indent:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"><span style="font-family:微軟雅黑">COD的UV計(jì)測(cè)量方法也是興起較晚的一種測(cè)量方法，它適用于無色透明、成分穩(wěn)定的水質(zhì)測(cè)量，有測(cè)量準(zhǔn)確、投資（意義：是未來收益的累積）費(fèi)用低廉的優(yōu)勢(shì)。冷光源陳列技術(shù)應(yīng)用，使用光源燈的壽命長(zhǎng)達(dá)10萬小時(shí)，測(cè)定參數(shù)光路的切換由手動(dòng)便成為自動(dòng)切換，消除了人為轉(zhuǎn)動(dòng)的誤差因素。但是，COD采用UV計(jì)測(cè)量受乙醇、有機(jī)酸等不具紫外吸光性物質(zhì)的限制較大，因此難以得到大范圍的推廣。</span></span></p><p style="margin-left:32px;text-indent:32px;text-align:justify;text-justify:inter-ideograph"><span style="font-family: 微軟雅黑;letter-spacing: 0;font-size: 16px;background: rgb(255, 255, 255)"> 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