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<div>　　余氯分析儀是一種專門用于檢測水中余氯含量的設備，它能夠提供準確、連續的余氯監測數據，對于保障水質安全具有重要意義。以下是關于余氯分析儀如何準確測量水中余氯含量的詳細探討：</div><div>　　<strong>一、余氯分析儀的工作原理</strong></div><div>　　余氯分析儀根據測量原理的不同，可分為電化學法和光電化學法兩種：</div><div>　　1.電化學法：通過測量電極間產生的電流或電壓來確定水中氯的濃度。這種方法通常使用膜電極，膜電極包含一個選擇性滲透膜，能夠允許氯離子通過。當樣品流經膜電極時，氯離子穿過膜進入電解質溶液中，并在電極表面發生氧化還原反應，產生電流或電壓信號。通過測量這個信號的大小，可以計算出氯的濃度。</div><div>　　2.光電化學法：通過測量樣品與特定試劑反應后生成的有色物質的吸光度來確定氯的濃度。通常使用N,N-二乙基對苯二胺（DPD）作為顯色劑，當樣品中的氯與DPD試劑反應時，會生成一種粉紅色的化合物。使用光電傳感器測量生成化合物的吸光度，吸光度與氯濃度之間存在一定的比例關系，通過預先標定的標準曲線可以換算出氯的濃度。</div><div>　　<strong>二、余氯分析儀的準確測量步驟</strong></div><div>　　1.標定儀器：使用標準液對分析儀進行標定，確保測量結果的準確性。按照儀器的說明書，將標準液輸入到檢測儀器中，并設置標定參數，如標定點數和標定范圍。</div><div>　　2.安裝與連接：將分析儀及其檢測器安裝在合適的位置，并連接好電纜線和外部報警器、余氯輸出控制器等。確保所有連接都牢固可靠。</div><div>　　3.預熱與清零：開機后，將分析儀預熱一段時間（通常為2分鐘），然后使用純凈水進行清零操作。</div><div>　　4.加入試劑與測量：取適量被測水樣倒入玻璃比色皿中，加入規定數量的余氯試劑（如DPD試劑），搖勻后放入樣槽座中進行測量。等待幾秒鐘后，分析儀即可顯示讀數。</div><div>　　5.記錄與存儲：按分析儀的存儲鍵可以存儲實驗記錄，方便后續查看和分析。<br /> </div><p align="center"><img src="https://img65.chem17.com/gxhpic_e8e86c5c75/1697e381d5facf78d0cbf43ef9e74a489c07728c309c8b859ed526e32a29ed1c859f4d3747038113.png" align="middle" alt="" /></p><p> </p><div>　　<strong>三、影響測量準確性的因素及應對措施</strong></div><div>　　1.水樣溫度：水樣溫度的變化會影響余氯的溶解度和擴散速度，導致測量結果出現誤差。因此，需要將水樣溫度控制在一定的范圍內（通常為20℃左右）。</div><div>　　2.水樣中氯離子的濃度：高濃度的氯離子會導致余氯檢測儀的讀數偏高，而低濃度的氯離子則會導致讀數偏低。因此需要控制水樣中氯離子的濃度范圍，并在必要時進行稀釋或濃縮處理。</div><div>　　3.水樣中其他離子和化合物的存在：水樣中存在的其他離子和化合物可能會與余氯發生反應，影響測量結果的準確性。例如，有機物、氨氮等物質會與余氯反應。因此，在測量前需要對水樣進行適當的預處理，以消除這些干擾因素。</div><div>　　4.樣品采集和處理：正確的樣品采集和處理方法可以保證測量結果的準確性。應使用干凈的采樣容器，避免污染；同時，在采樣后應盡快進行分析，避免水樣變質。</div><div>　　5.儀器使用方法：不同的余氯分析儀使用方法可能不同，需要嚴格按照操作方法進行測量。不正確的使用方法可能會導致測量結果出現誤差。</div><div>　　6.儀器維護和校準：定期對分析儀進行維護和校準可以保證其準確性和穩定性。包括清潔傳感器、更換滲透膜、校準標準曲線等操作。</div><div>　　7.環境條件：環境溫度、濕度以及電磁干擾等因素也可能對測量結果產生影響。因此，需要將分析儀放在溫度、濕度穩定且無電磁干擾的環境中。</div><div>　　余氯分析儀通過其特別的工作原理和準確的測量步驟，能夠實現對水中余氯含量的準確測量。同時，為了獲得更準確、更可靠的測量結果，還需要注意控制水樣因素、規范操作方法、定期對儀器進行維護和校準以及確保儀器處于適宜的環境條件中。</div> </div> <div id="fvzbnvb" class="ly_PrevNext"> <ul> 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