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class="search_right"> <form action="/products.html" method="post" onsubmit="return checkFrom(this);"> <div id="s0woeqo" class="sc_ipt"><input type="text" name="keyword" placeholder="請輸入產(chǎn)品名稱" maxlength="50" /></div> <div id="aw0ce0c" class="sc_btn"><input type="submit" value="搜索" /></div> <div id="ak0smaa" class="clear"></div> </form> </div> <div id="mumskk0" class="clear"></div> </div> </div>   <div id="akasym2" class="ly_crumb"> <img src="/skins/270528/images/crumb_icon.png" /><p>當(dāng)前位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > <span>水質(zhì)pH值的測定定義和原理</span></p> </div>   <div id="sqw0uii" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">水質(zhì)pH值的測定定義和原理</h1> <div id="q0iaqsq" class="NyNewsdetail_tips">更新時間：2019-12-13 點擊次數(shù)：4734</div> <div id="0i4ow0c" class="NyNewsdetail_con"> <p><span style="font-size:10.5000pt"><span style="font-family:宋體">1 定義</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> pH是從操作上定義的。對于溶液X，測出伽伐尼電池 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 參比</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">｜KCl濃溶液｜溶液x｜H</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">｜P</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">t</span></span></sub> </p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 的電動勢Ex。將未知pH ( X)的溶液X換成標(biāo)準(zhǔn)pH溶液S，同樣測出電池的電動勢E</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">S</span></span></sub><span style="font-size:10.5000pt"><span style="font-family:宋體">，則 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> pH(X)=pH(S)+(Es -Ex)F/(RT1n10) </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 因此，所定義的pH是無量綱的量。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> pH沒有理論上的意義，其定義為一種實用定義。但是在物質(zhì)的量濃度小于0.1mo1 dm</span></span><sup><span style="font-size:10.5000pt"><span style="font-family:宋體">3</span></span></sup><span style="font-size:10.5000pt"><span style="font-family:宋體">的稀薄水溶液有限范圍，既非強酸性又非強堿性(2<pH<12)時，則根據(jù)定義，有: </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> pH=-log</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">10</span></span></sub><span style="font-size:10.5000pt"><span style="font-family:宋體"> [c (H) y/ (mol·dm</span></span><sup><span style="font-size:10.5000pt"><span style="font-family:宋體"> 3</span></span></sup><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">0.02 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 式中，c (H)代表氫離子H的物質(zhì)的量濃度，</span></span><span style="font-size:10.5000pt"><span style="font-family:微軟雅黑">y</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">代表溶液中典型1一1價電解質(zhì)的活度系數(shù)。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">2 原理</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> pH值由測量電池的電動勢而得。該電池通常由飽和甘汞</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">為參比電極，</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">玻璃電極</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">為指示電極所組成。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">溶液中每變化1個pH單位，電位差改變?yōu)?9.16 mV，據(jù)此在儀器（<strong>PH儀表</strong>）上直接以pH的讀數(shù)表示。溫度差異在儀器上有補償裝置。 </span></span></p> </div> <div id="2w0yqcq" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-2065342/">化學(xué)需氧量（CODcr）水質(zhì)在線自動監(jiān)測儀的儀器類型</a></li> <li>下一篇：<a href="/szhcy-Article-2062752/">化學(xué)需氧量（CODcr ）水質(zhì)在線自動監(jiān)測儀適用范圍</a></li> </ul> </div> </div>   <div id="0gaqkwi" class="foot_box"> <div id="eeuwa0m" class="foot_t"> <div id="0mgk0qs" 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 href="javascript:;" class="toTop"></a></span> </div> </div> <div id="0k2ae80" class="foot_b"> 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