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class="NyNewsdetail_title">測量PH應(yīng)注意的問題</h1> <div id="dhc2x7dn9l" class="NyNewsdetail_tips">更新時間：2019-06-29 點擊次數(shù)：2217</div> <div id="dhc2x7dn9l" class="NyNewsdetail_con"> <p><span style="font-family:宋體">在正式測量前，首先應(yīng)檢查儀器、電極</span>(<strong>pH</strong><strong><span style="font-family:宋體">電極</span></strong>)<span style="font-family:宋體">、標(biāo)準(zhǔn)緩沖液三者是否正常。通常做法是：根據(jù)待測樣品的</span>pH<span style="font-family:宋體">值范圍，在其附近選用兩種標(biāo)準(zhǔn)緩沖溶液。用種溶液定位后，再對第二種溶液測試，觀察其讀數(shù)，儀器響應(yīng)值與第二種溶液的</span>pH<span style="font-family:宋體">值之差不得大于</span>0. 1pH<span style="font-family:宋體">單位。如超過此誤差，并經(jīng)另換第三種標(biāo)準(zhǔn)緩沖液檢驗，亦存在上述問題時。則應(yīng)對電極和標(biāo)準(zhǔn)緩沖液質(zhì)量進行檢查，以探明原因，其中多數(shù)為電極出毛病所致，應(yīng)考慮進行適當(dāng)處理或更換新的低電極。</span></p><p><span style="font-family:宋體">更換標(biāo)準(zhǔn)緩沖液或樣品時，應(yīng)用水對電極進行充分的淋洗，用濾紙吸去電極土的水滴，再用待測溶液淋洗，以消除相互影響，這一點對弱緩沖性溶液尤為重要。</span></p><p><span style="font-family:宋體">測量</span>pH<span style="font-family:宋體">時，溶液應(yīng)適當(dāng)進行攪拌，以使溶液均勻和達(dá)到電化學(xué)平衡，而在讀數(shù)時則應(yīng)停止攪動，靜置片刻，以使讀數(shù)穩(wěn)定。</span></p> </div> <div id="dhc2x7dn9l" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-1883659/">電化學(xué)探頭法的實驗步驟</a></li> <li>下一篇：<a href="/szhcy-Article-1881487/">pH電極的測定方法</a></li> </ul> </div> </div>   <div id="dhc2x7dn9l" class="foot_box"> <div id="dhc2x7dn9l" class="foot_t"> <div id="dhc2x7dn9l" 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="dhc2x7dn9l" class="foot_b"> <div id="dhc2x7dn9l" class="w1200"> <div id="dhc2x7dn9l" class="f_b_t clear"> <div id="dhc2x7dn9l" class="f_contact fl"> <p>聯(lián)系我們 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