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余氯測試儀為水質(zhì)調(diào)控提供科學(xué)依據(jù)

發(fā)布日期: 2025-08-21
瀏覽人氣: 129
   在飲用水安全、游泳池水質(zhì)管理、污水處理及食品加工消毒過程中,余氯作為重要的消毒劑殘留指標,其濃度高低直接關(guān)系到殺菌效果與人體健康。過高可能產(chǎn)生異味與刺激,過低則無法有效抑制微生物。余氯測試儀作為精準測氯的工具,通過DPD比色法或電化學(xué)傳感器技術(shù),快速測定水中游離氯、總氯含量,為水質(zhì)調(diào)控提供科學(xué)依據(jù)。為確保測量結(jié)果準確可靠,余氯測試儀必須遵循規(guī)范、嚴謹?shù)牟僮髁鞒獭?br />

 


  第一步:儀器檢查與準備工作
  使用前檢查余氯測試儀外觀是否清潔,顯示屏清晰,電池電量充足或電源連接正常。若為比色計,確認光源無損壞;若為電極式儀器,檢查電極膜是否完整、填充液充足。確保比色皿或傳感器探頭潔凈無劃痕、無水漬。
  第二步:試劑準備與校準驗證
  對于DPD比色法儀器,準備有效的DPD試劑粉包或液體試劑。檢查試劑是否在保質(zhì)期內(nèi),避免受潮或氧化失效。關(guān)鍵步驟:使用標準緩沖液或已知濃度的余氯標準溶液進行儀器校準或性能驗證,確保測量基準準確。
  第三步:水樣采集與處理
  用潔凈的采樣瓶采集待測水樣,避免污染。若水樣渾濁或有色,需先過濾或進行背景補償,防止干擾。采樣后盡快測試,避免余氯自然衰減影響結(jié)果。
  第四步:添加試劑與反應(yīng)(比色法適用)
  向比色皿中加入規(guī)定體積的水樣(如10mL),投入一包DPD試劑,蓋緊搖勻,避光靜置反應(yīng)1–3分鐘,使游離氯與DPD充分反應(yīng)生成紅色化合物。若需測總氯,先加第一包試劑測游離氯,再加第二包催化劑(如甘氨酸或KBr),繼續(xù)反應(yīng)后測總氯。
  第五步:測量與讀數(shù)
  將比色皿擦干外壁,正確放入儀器樣品槽,關(guān)閉遮光蓋。啟動測量程序,儀器自動讀取吸光度并轉(zhuǎn)換為余氯濃度(mg/L或ppm)。對于電化學(xué)式儀器,將探頭浸入水樣,待數(shù)值穩(wěn)定后記錄讀數(shù)。
  第六步:清潔與維護
  測試完成后,立即用去離子水清洗比色皿、試劑倉及傳感器探頭,防止殘留物腐蝕或堵塞。長期不用時,電極應(yīng)浸泡在專用保護液中。定期對儀器進行校準與功能檢查。
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