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value="GO"> </form> </div> </div> </div>  <div id="sq82xwe7wu" class="ly_crumb"> <img src="/skins/257424/images/home.png"> <p>當(dāng)前位置：<a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > <span>納氏試劑在氨氮檢測(cè)中的應(yīng)用</span></p> </div>   <div id="sq82xwe7wu" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">納氏試劑在氨氮檢測(cè)中的應(yīng)用</h1> <div id="sq82xwe7wu" class="NyNewsdetail_tips">更新時(shí)間：2024-01-16 點(diǎn)擊次數(shù)：673</div> <div id="sq82xwe7wu" class="NyNewsdetail_con" id="c_detail_wrap"> <div><span style="font-size: 14px;">　　納氏試劑是檢測(cè)水質(zhì)氨氮的關(guān)鍵，在使用納氏試劑的時(shí)候會(huì)遇到哪些問(wèn)題?如何選用納氏試劑呢?<br /> </span></div><div><span style="font-size: 14px;">　　在污水治理中常見(jiàn)污染物指標(biāo)有COD、BOD、氨氮、總氮等。其中氨氮廢水主要來(lái)源于化肥、焦化、石化、制藥、食品、垃圾填埋場(chǎng)等，大量氨氮廢水排入水體不僅引起水體富營(yíng)養(yǎng)化、造成水體黑臭，給水處理的難度和成本加大，甚至對(duì)人群及生物產(chǎn)生毒害作用，目前，氨氮是環(huán)境行業(yè)在日常分析中必須檢測(cè)的項(xiàng)目。<br /> </span></div><div><span style="font-size: 14px;">　　到底什么是氨氮呢?<br /> </span></div><div><span style="font-size: 14px;">　　氨氮是指水中以游離氨(NH3)和銨離子(NH4+)形式存在的氮。氨氮是水體中的營(yíng)養(yǎng)素，可導(dǎo)致水富營(yíng)養(yǎng)化現(xiàn)象產(chǎn)生，是水體中的主要耗氧污染物，對(duì)魚(yú)類(lèi)及某些水生生物有毒害。<br /> </span></div><div><span style="font-size: 14px;">　　氨氮檢在相關(guān)國(guó)標(biāo)里是怎么規(guī)定的呢?<br /> </span></div><div><span style="font-size: 14px;">　　國(guó)家標(biāo)準(zhǔn)《GB3838-2002地表水環(huán)境質(zhì)量標(biāo)準(zhǔn)》和《GB 5749-2006 生活飲用水衛(wèi)生標(biāo)準(zhǔn)》對(duì)氨氮含量都有明確的控制范圍和限值。<br /> </span></div><div><span style="font-size: 14px;">　　例如，依據(jù)國(guó)家環(huán)保標(biāo)準(zhǔn)方法《HJ535-2009水質(zhì)氨氮的測(cè)定納氏試劑分光光度法》，該方法原理是以游離態(tài)的氨或銨離子等形式存在的氨氮與納氏試劑反應(yīng)生成淡紅棕色絡(luò)合物，該絡(luò)合物的吸光度與氨氮含量成正比，于波長(zhǎng)420nm處測(cè)量吸光度，測(cè)定吸光度即可根據(jù)繪制的標(biāo)準(zhǔn)曲線(xiàn)得到氨氮的含量，該方法測(cè)定上限為2mg/L。<br /> </span></div><div><span style="font-size: 14px;">　　納氏試劑在氨氮檢測(cè)中的應(yīng)用。納氏試劑(Nessler)是指一種利用紫外-可見(jiàn)分光光度法原理用于測(cè)定空氣中、水體中氨氮含量的試劑，是一種常溫下略顯淡黃綠色的透明溶液，隨著暴光時(shí)間增加逐漸生成黃棕色沉淀，溶液會(huì)漸漸變黃。由于碘離子和汞離子在強(qiáng)堿性條件下，會(huì)與氨反應(yīng)生成淡紅棕色絡(luò)合物，并且此顏色在波長(zhǎng)420nm處會(huì)有強(qiáng)烈的吸收，而生成的這類(lèi)紅棕色絡(luò)合物的吸光度會(huì)與其溶液的氨氮含量成正比。所以可用測(cè)試反應(yīng)液的吸收值來(lái)測(cè)定氨氮的含量。</span></div> </div> <div id="sq82xwe7wu" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/jsshengaohua-Article-3595987/">氨氮快速測(cè)定儀的操作要遵守哪些步驟</a></li> <li>下一篇：<a href="/jsshengaohua-Article-3590246/">COD檢測(cè)儀是保護(hù)水資源的重要工具</a></li> </ul> </div> </div>   <div id="sq82xwe7wu" class="foot_box"> <div id="sq82xwe7wu" class="footCon"> <div id="sq82xwe7wu" class="foot_t w1300"> <div id="sq82xwe7wu" class="foot_lv"> <div id="sq82xwe7wu" class="foot_logo"><img src="/skins/257424/images/foot_logo.png" /></div> <div id="sq82xwe7wu" class="foot_nav"> <ul> <li><a href="/">首頁(yè)</a></li> <li><a href="/products.html">產(chǎn)品中心</a></li> <li><a href="/aboutus.html" 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