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src="/skins/270528/images/crumb_icon.png" /><p>當(dāng)前位置：<a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > <span>PH值的原理</span></p> </div>   <div id="memso0k" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">PH值的原理</h1> <div id="k2m0msa" class="NyNewsdetail_tips">更新時(shí)間：2020-10-12 點(diǎn)擊次數(shù)：3432</div> <div id="mokeac0" 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(fù)對(duì)數(shù)。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> pH是<span id="k2k80o0" class="bjFfcClass">常用</span>的水質(zhì)指標(biāo)之一。天然水的pH大約在6 ~9的范圍內(nèi)，飲用水pH要求在6.5~8. 5之間。當(dāng)水體受到酸、堿污染后，將引起水體PH變化。為了保護(hù)水體，我國(guó)規(guī)定，河流水體pH應(yīng)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(xué)中常用的和重要的檢驗(yàn)項(xiàng)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(cè)定時(shí)應(yīng)在規(guī)定的溫度下進(jìn)行，或者校正溫度。通常采用玻璃電極法和比色法測(cè)定pH。比色法簡(jiǎn)便，但受色度、濁度、膠體物質(zhì)、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(fù)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(gè)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(guò)儀器上的補(bǔ)償裝置進(jìn)行校正。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 測(cè)定方法:按照儀器使用說(shuō)明書(shū)準(zhǔn)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(biāo)準(zhǔn)緩沖溶液依次對(duì)儀器進(jìn)行校正，在現(xiàn)場(chǎng)取一定水樣測(cè)定或?qū)㈦姌O插入水體直接測(cè)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(cè)定方法:將已知pH的系列緩沖溶液加入適當(dāng)?shù)闹甘緞┲瞥蓸?biāo)準(zhǔn)色液并封裝在小安瓿瓶?jī)?nèi)，測(cè)定時(shí)取與緩沖溶液同量的水樣，加入與標(biāo)準(zhǔn)系列相同的指示劑，然后進(jìn)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="20gsqgs" 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(xiàng)？</a></li> <li>下一篇：<a 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