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style="font-family:宋體"> 酸度計或離</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">子濃度計。常規(guī)檢驗使用的儀器，至少應當?shù)?.1pH單位，pH（<strong>PH儀表</strong>）范圍從0至14。如有特殊需要，應使用精度更高的儀器。 </span></span></p><p><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">與甘汞電極。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 樣品保存現(xiàn)場測定。否則，應在采樣后把樣品保持在0~4</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">，并在采樣后6h之內(nèi)進行測定。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體">步驟 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 儀器校準：操作程序按儀器使用說明書進行。先將水樣與標準溶液調(diào)到同一溫度，記錄測定溫度，并將儀器溫度補償旋鈕調(diào)至該溫度上。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 用標準溶液校正儀器，該標準溶液與水樣pH相差不超過2個pH單位。從標準溶液中取出</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">，*沖洗并用濾紙吸干。再將電極浸入第二個標準溶液中，其pH大約與第1個標準溶液相差3個pH單位，如果儀器響應的示值與第2個標準溶液的pH(S)值之差大于0.1pH單位，就要檢查儀器、電極或標準溶液是否存在問題。當三者均正常時，方可用于測定樣品。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 樣品測定，測定樣品時，先用蒸餾水認真沖洗電極，再用水樣沖洗，然后將</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">浸入樣品中，小心搖動或進行攪拌使其均勻，靜置，待讀數(shù)穩(wěn)定時記下pH值。 </span></span></p> </div> <div id="35hf15jpnp" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-2052470/">電導率水質(zhì)自動分析儀檢驗方法</a></li> <li>下一篇：<a href="/szhcy-Article-2050264/">PH標準緩沖溶液（簡稱標準溶液）的配制方法</a></li> </ul> </div> </div>   <div id="35hf15jpnp" class="foot_box"> <div id="35hf15jpnp" 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