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class="sc_btn"><input type="submit" value="搜索" /></div> <div id="35hf15jpnp" class="clear"></div> </form> </div> <div id="35hf15jpnp" class="clear"></div> </div> </div>   <div id="35hf15jpnp" class="ly_crumb"> <img src="/skins/270528/images/crumb_icon.png" /><p>當前位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > <span>溶解氧分析儀的校準方法</span></p> </div>   <div id="35hf15jpnp" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">溶解氧分析儀的校準方法</h1> <div id="35hf15jpnp" class="NyNewsdetail_tips">更新時間：2019-11-27 點擊次數(shù)：13386</div> <div id="35hf15jpnp" class="NyNewsdetail_con"> <p><span style="font-size:10.5000pt"><span style="font-family:宋體">1、用校正液校準 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 在國家環(huán)境保護行業(yè)標準HJ/T 99-2003《</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">溶解氧(DO)水質(zhì)自動分析儀</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">技術(shù)要求》中，推薦的校準方法和步驟如下。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">① 校正液的配制。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 零點校正液：將約25g的無水Na</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:10.5000pt"><span style="font-family:宋體">SO</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">3</span></span></sub><span style="font-size:10.5000pt"><span style="font-family:宋體">溶于蒸餾水中，加蒸餾水至500mL。使用時配制。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 量程校正液：在(25</span></span><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">0. 5 )℃下，以約1L/min的流量將空氣通入蒸餾水[應該把盛蒸餾水的容器放在(25</span></span><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">0. 5)℃的水浴中]，并使其中的溶解氧達到飽和，靜置一段時間后使溶解氧達到穩(wěn)定(通常，200mL水需要5~10min; 500mL水需要10~20min)。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 說明:溶解氧的濃度隨大氣壓的變化而不同，所以采用大氣壓補償。另外，在測定高鹽度試樣時，在配制溶解氧飽和水時，應根據(jù)試樣中鹽類的摩爾濃度添加NaCl試劑。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">②校正。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 零點校正：將</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">電極</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">浸入零點校正液，將指示值調(diào)整為零點。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 量程校正：將電極浸入量程校正液，在用磁攪拌器攪拌的同時，待顯示值穩(wěn)定后，測定量程校正液的溫度(準確至</span></span><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">1</span></span><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">，根據(jù)飽和溶解氧濃度值調(diào)整顯示值。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 說明:顯示值一般隨試樣的流速變化而變化，因此攪拌速度應按照生產(chǎn)商規(guī)定的方法，使電極表面的液體流速保持恒定。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 調(diào)節(jié):交替進行零點校正和量程校正操作，調(diào)節(jié)分析儀直至校正液的測定值與顯示值之差在</span></span><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">0.25mg/L以內(nèi)為止。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">2、 </span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">在空氣中校準 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 這種方法簡便易行，是某些儀表使用說明書中推薦的方法。注意在取出</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">傳感器探頭</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">置于空氣中進行校準前，先要用脫鹽水將其清洗干凈，再用濾紙吸干表面水分。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">對于</span></span><span style="font-size:10.5000pt"><span style="font-family:calibri">μ</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">g/L級微量</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">溶解氧分析</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">來說，這種校準方法準確度低，不宜采用。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">3、用被測介質(zhì)來做校準 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 這種校準方法主要用于生物發(fā)酵過程。在消毒完成后，向未接種的介質(zhì)中充入潔凈的壓縮空氣，使介質(zhì)中的溶解氧達到飽和狀態(tài)，然后用傳感器來校準100%濃度，再用百分比濃度來檢測和控制整個發(fā)酵過程。</span></span></p> </div> <div id="35hf15jpnp" class="ly_PrevNext"> <ul> <li>上一篇：<a 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