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</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">技術文章</a> > <span>PH值的原理</span></p> </div>   <div id="35hf15jpnp" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">PH值的原理</h1> <div id="35hf15jpnp" class="NyNewsdetail_tips">更新時間：2020-10-12 點擊次數：3422</div> <div id="35hf15jpnp" class="NyNewsdetail_con"> <p><span style="font-size:10.5000pt"><span style="font-family:宋體"> pH是水中氫離子活度的負對數。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> pH是<span id="35hf15jpnp" class="bjFfcClass">常用</span>的水質指標之一。天然水的pH大約在6 ~9的范圍內，飲用水pH要求在6.5~8. 5之間。當水體受到酸、堿污染后，將引起水體PH變化。為了保護水體，我國規(guī)定，河流水體pH應在 6.5~9之間。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> pH是水化學中常用的和重要的檢驗項目之一，由于pH（</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">PH儀表</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">）受水溫影響而變化，測定時應在規(guī)定的溫度下進行，或者校正溫度。通常采用玻璃電極法和比色法測定pH。比色法簡便，但受色度、濁度、膠體物質、氧化劑、還原劑及鹽度的干擾。</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">法基本上不受以上上因素的干擾，因而一般推薦使用玻璃電極法。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">(a)玻璃電極法(GB/T 6920一1986)</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 原理:以飽和甘汞電極為參比電極，</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">為指示電極組成電池(或直接采用復合電極)，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">以下，溶液中每變化一個pH單位，電位差就變化59. 16mV ,將電壓表刻度變?yōu)閜H刻度，便可直接讀出溶液的pH ,溫度差可以通過儀器上的補償裝置進行校正。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 測定方法:按照儀器使用說明書準備好儀器，用鄰苯二甲酸氧鉀、磷酸二氫鉀磷酸氫二鈉和四硼酸鈉標準緩沖溶液依次對儀器進行校正，在現場取一定水樣測定或將電極插入水體直接測定pH。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">(b)比色法 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 原理:各種酸堿指示劑在不同pH的水溶液中顯示不同的顏色，而每種指示劑都有一定的變色范圍。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 測定方法:將已知pH的系列緩沖溶液加入適當的指示劑制成標準色液并封裝在小安瓿瓶內，測定時取與緩沖溶液同量的水樣，加入與標準系列相同的指示劑，然后進行比較，確定水樣的pH。該方法不適用于有色、渾濁或含較高游離氯、氧化劑、還原劑的水樣。 </span></span></p> </div> <div id="35hf15jpnp" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-2403138/">一體化超純水系統(tǒng)選型和安裝要注意哪些事項？</a></li> <li>下一篇：<a href="/szhcy-Article-2397703/">導致超純水設備反滲透膜受污染有哪些原因？</a></li> </ul> </div> </div>   <div id="35hf15jpnp" class="foot_box"> <div id="35hf15jpnp" class="foot_t"> <div id="35hf15jpnp" 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