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id="3k2hsvbby" class="NyNewsdetail_tips">更新時間：2019-11-16 點擊次數(shù)：9259</div> <div id="3k2hsvbby" class="NyNewsdetail_con"> <p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 水的純度是指高純水中溶解離子的含量，即其含鹽量。高純水中的含鹽量很難用蒸餾稱量方法測定，因此水的純度一般不用質(zhì)量濃度來表示，而常用水的</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">電導(dǎo)率</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">來表示。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 對于同一種水，以溫度25℃為基準(zhǔn)，其</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">電導(dǎo)率</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">與含鹽量大致成正比關(guān)系。比例關(guān)系或換算系數(shù)為: </span></span></p><p><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:calibri">μ</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">S/cm(電導(dǎo)率)</span></span><span style="font-size:10.5000pt"><span style="font-family:arial">≈</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">0. 55</span></span><span style="font-size:10.5000pt"><span style="font-family:calibri">~</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">0. 90mg/L(含鹽量) </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 根據(jù)實際經(jīng)驗，通常在pH值5~9的范圍內(nèi)，天然水的</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">電導(dǎo)率</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">與水溶液中的含鹽量之比大約為1 : (0. 6~0. 8)。一般鍋爐水，如將電導(dǎo)率大的OH</span></span><sup><span style="font-size:10.5000pt"><span style="font-family:宋體">-</span></span></sup><span style="font-size:10.5000pt"><span style="font-family:宋體">中和成中性鹽，則鍋爐水的電導(dǎo)率與含鹽量之比為1：(0. 5~0. 6)，即I</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">S/cm相當(dāng)于0.5~0. 6mg/L。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 在其他溫度下，則需加以校正。若水樣溫度不是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">，測定數(shù)值應(yīng)按下式換算成25℃的電導(dǎo)率值 </span></span></p><p> <img src="http://img71.chem17.com/9/20191116/637094919962653864852.png" style="height:42px; width:376px" /> </p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 式中</span></span><span style="font-size:10.5000pt"><span style="font-family:calibri">ϒ</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">(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">)</span></span> <span style="font-size:10.5000pt"><span style="font-family:宋體">換算成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">時水樣的電導(dǎo)率，</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">S/ cm </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:calibri"> ϒ</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">t</span></span></sub> <span style="font-size:10.5000pt"><span style="font-family:宋體">水溫為t ( </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"> )時的電導(dǎo)率，</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">S/cm; </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:arial"> β</span></span> <span style="font-size:10.5000pt"><span style="font-family:宋體">溫度校正系數(shù)(通常情況下</span></span><span style="font-size:10.5000pt"><span style="font-family:arial">β</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">近似等于0.02) ; </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> t</span></span> <span style="font-size:10.5000pt"><span style="font-family:宋體">測定時水樣的溫度，</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">.</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 注意，根據(jù)文獻(xiàn)記載，純水的</span></span><span style="font-size:10.5000pt"><span style="font-family:arial">β</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">值會隨水的</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">電導(dǎo)率</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">下降而變化，所以純水的溫度補償必須考慮</span></span><span style="font-size:10.5000pt"><span style="font-family:arial">β</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">的變化。</span></span></p> </div> <div id="3k2hsvbby" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-2036293/">游離氯、總氯、余氯分析儀的區(qū)別</a></li> <li>下一篇：<a href="/szhcy-Article-2034499/">氧化還原電位計（ORP計）的定義</a></li> </ul> </div> </div>   <div id="3k2hsvbby" class="foot_box"> <div id="3k2hsvbby" class="foot_t"> <div id="3k2hsvbby" class="w1200"> <a href="/">網(wǎng)站首頁</a>　|　<a href="/aboutus.html">關(guān)于我們</a>　|　<a href="/products.html">產(chǎn)品中心</a>　|　<a href="/news.html">新聞動態(tài)</a>　|　<a href="/article.html">技術(shù)文章</a>　|　<a href="/honor.html">榮譽資質(zhì)</a>　|　<a href="/order.html" target="_blank">在線留言</a>　|　<a href="/contact.html">聯(lián)系我們</a> <span><a 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