廢水中含有鉻時該怎么測定COD的含量？-泡沫玻璃廠家＿亞綠環?？萍加邢薰?/title> <meta name="description" content="業界資訊您的位置 : 精科儀器 > 業界資訊 > 廢水中含有鉻時該怎么測定COD的含量？廢水中含有鉻時該怎么測定COD的含量？時間 : 2021 " /> <meta name="keywords" content="廢水中含有鉻時該怎么測定COD的含量？" /> <meta http-equiv="X-UA-Compatible" content="edge"> <link rel="stylesheet" href="http://www.worksbymichaellawrence.com/template/company/xys_blue/css/uikit.css"> <link rel="stylesheet" href="http://www.worksbymichaellawrence.com/template/company/xys_blue/css/iven.css"> <link rel="stylesheet" href="http://www.worksbymichaellawrence.com/template/company/xys_blue/css/slideshow.css"> <link rel="stylesheet" href="http://www.worksbymichaellawrence.com/template/company/xys_blue/css/slidenav.css"> <link rel="stylesheet" href="http://www.worksbymichaellawrence.com/template/company/xys_blue/css/responsive.css"> <script src="http://www.worksbymichaellawrence.com/template/company/xys_blue/js/jquery-1.11.1.min.js"></script> <script 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<span class="breadcrumbs"> 您現在的位置：<a href="/">首頁</a> > <a href="http://www.worksbymichaellawrence.com/newslist/idqsxea/">聯系我們</a> </span> </div> <div class="article-body uk-container-center"> <h2 class="article-title">廢水中含有鉻時該怎么測定COD的含量？ <span class="n-date">DATE: 2023-12-04 20:46:54</span></h2> <div class="article-content"> <p><h5>業界資訊</h5>您的廢水位置 : 精科儀器 > 業界資訊 > 廢水中含有鉻時該怎么測定COD的含量？ <h1>廢水中含有鉻時該怎么測定COD的含量？</h1>時間 : 2021-10-22 14:46:08 閱讀 : 82 　　在與COD快速分析儀相同的實驗條件下測定樣品的COD值。實驗結果表明，中含六價鉻濃度對COD的有鉻<strong></strong>測定有負面影響。隨著六價鉻濃度的時該增加，COD測量值出現。測定六價鉻濃度越小，含量為500mg/L，廢水COD的中含測量值幾乎為0mg/L.理論上，1摩爾的有鉻六價鉻離子和3摩爾的硫酸亞鐵銨反應。對應于10mL，時該100mg/L六價鉻樣品中所含的測定六價鉻離子的COD值為51.2mg/L，這與實驗結果基本一致。含量<br />　　<br />　　六價鉻和COD濃度對測定的廢水<strong></strong>影響<br />　　<br />　　將COD與鄰苯二甲酸氫鉀的標準溶液和用重鉻酸鉀制備的六價鉻標準溶液分別置于比色管中，COD濃度為200mg/L，中含400mg/L，有鉻六價鉻。濃度為0mg/L? 100mg/L? 200mg/L? 300mg/L? 400mg/L? 500mg/L系列混合樣品，去除樣品中六價鉻離子對硫酸亞鐵銨的干擾COD值樣品由COD快速分析儀方法確定。結果表明，去除六價鉻離子干擾后，含鉻廢水中COD的測定可以很好地反映標準樣品的標準值。 COD濃度和六價鉻濃度對測定的影響不大。<br />　　<br />　　精確度和精度實驗<br />　　<br />　　在精密實驗中，選擇來自五個不同電鍍企業的含鉻廢水的隨機均勻樣品，每個樣品測量6次，同時測定樣品的六價鉻濃度。六價鉻濃度在100-300mg/L之間，平行樣品的相對標準偏差（RSD）變化不大，從1.19％到2.50％不等，表明不同類型鉻的測定結果的重現性含有廢水。良好，精度高，測量結果偏差范圍可以滿足檢測要求。<br />　　<img src="http://image.jkcod.net/storage/16168/article/20211022/20211022084814_80899.jpg" alt="多參數水質分析儀" title=""><br />　　通過標準添加到實際樣品中來確定方法的準確性。對5家不同電鍍企業含鉻廢水的隨機均勻樣品加入濃度為10000 mg/L的COD溶液。將水樣均勻地取20mL，將標準溶液的體積加入到0.4mL中，并將標準溶液加入到濃度中。對于200mg/L，計算回收率。加標回收率為98％~102.5％，表明該方法精度較高，可滿足檢測要求。<br />　　<br />　　實驗表明，使用苯甲酸鄰氨基苯甲酸作為指示劑，在緩慢搖動的同時向樣品中緩慢加入硫酸亞鐵銨溶液，可以很好地消除含鉻廢水中六價鉻離子的干擾。 COD快速分析儀在測定含鉻廢水的COD方面具有良好的精度和準確度，是解決含鉻廢水COD測定問題的良好方法。<br />　　<br />　　由于該方法主要依賴于指示劑顏色的變化，因此需要在搖動的同時緩慢加入硫酸亞鐵銨溶液，使樣品顏色變綠，特別是在低濃度時。<br /><br />? ? ? 以上信息就是我們為大家分享的關于水質檢測的一些小常識， <br /></p><p><br></p></div> <div class="uk-grid uk-grid-collapse nextpage"> <div class="uk-width-medium-1-10"> </div> <div class="uk-width-medium-5-10"> <a href="http://www.worksbymichaellawrence.com/html/82f299915.html">使用化學需氧量測定儀器時應注意什么</a> </div> <div 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