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style="font-family:宋體">時，應嚴格按</span><strong><span style="font-family:Calibri">PH</span><span style="font-family:宋體">在線監(jiān)測儀</span></strong><span style="font-family:宋體">的使用說明書操作，并注意下列事項。</span></span></p><p><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體"> （</span><span style="font-family:Calibri">1</span><span style="font-family:宋體">）測定前，按各品種項下的規(guī)定，選擇兩種</span><span style="font-family:Calibri">pH</span><span style="font-family:宋體">值約相差</span><span style="font-family:Calibri">3</span><span style="font-family:宋體">個</span><span style="font-family:Calibri">pH</span><span style="font-family:宋體">單位的標準緩沖液，并使供試液的</span><span style="font-family:Calibri">pH </span><span style="font-family:宋體">值處于兩者之間。</span></span></p><p><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體"> （</span><span style="font-family:Calibri">2</span><span style="font-family:宋體">）取與供試液</span><span style="font-family:Calibri">pH </span><span style="font-family:宋體">值較接近的種標準緩沖液對儀器進行校正（定位），使儀器示值與表列數(shù)值一致。</span></span></p><p><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體"> （</span><span style="font-family:Calibri">3</span><span style="font-family:宋體">）儀器定位后，再用第二種標準緩沖液核對儀器示值，誤差應不大于±</span><span style="font-family:Calibri">0.02pH </span><span style="font-family:宋體">單位。若大于此偏差，則應小心調(diào)節(jié)斜率，使示值與第二種標準緩沖液的表列數(shù)值相符。重復上述定位與斜率調(diào)節(jié)操作，至儀器示值與標準緩沖液的規(guī)定數(shù)值相差不大于</span><span style="font-family:Calibri">0.02pH</span><span style="font-family:宋體">單位。否則，需檢查儀器或更換電極后，再行校正至符合要求。</span></span></p><p><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體"> （</span><span style="font-family:Calibri">4</span><span style="font-family:宋體">）每次更換標準緩沖液或供試液前，應用純化水充分洗滌電極，然后將水吸盡，也可用所換的標準緩沖液或供試液洗滌。</span></span></p><p><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體"> （</span><span style="font-family:Calibri">5</span><span style="font-family:宋體">）在測定高</span><span style="font-family:Calibri">pH</span><span style="font-family:宋體">值的供試品和標準緩沖液時，應注意堿誤差的問題，必要時選用適當?shù)牟Ａщ姌O測定。</span></span></p><p><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體"> （</span><span style="font-family:Calibri">6</span><span style="font-family:宋體">）對弱緩沖或無緩沖作用溶液的</span><span style="font-family:Calibri">pH</span><span style="font-family:宋體">值測定，先用苯二甲酸鹽標準緩沖液校正儀器后測定供試液，并重取供試液再測，直至</span><span style="font-family:Calibri">pH</span><span style="font-family:宋體">值的讀數(shù)在</span><span style="font-family:Calibri">1 </span><span style="font-family:宋體">分鐘內(nèi)改變不超過±</span><span style="font-family:Calibri">0.05</span><span style="font-family:宋體">止；然后再用硼砂標準緩沖液校正儀器，再如上法測定；二次</span><span style="font-family:Calibri">PH</span><span style="font-family:宋體">在線監(jiān)測儀</span><span style="font-family:Calibri">pH</span><span style="font-family:宋體">值的讀數(shù)相差應不超過</span><span style="font-family:Calibri">0.1</span><span style="font-family:宋體">，取二次讀數(shù)的平均值為其</span><span style="font-family:Calibri">pH</span><span style="font-family:宋體">值。</span></span></p><p><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體"> （</span><span style="font-family:Calibri">7</span><span style="font-family:宋體">）配制標準緩沖液與溶解供試品的水，應是新沸過并放冷的純化水，其</span><span style="font-family:Calibri">pH</span><span style="font-family:宋體">值應為</span><span style="font-family:Calibri">5.5</span><span style="font-family:宋體">～</span><span style="font-family:Calibri">7.0</span><span style="font-family:宋體">。</span></span></p><p><span style=";font-family:宋體;font-size:14px"><span style="font-family:宋體"> （</span><span style="font-family:Calibri">8</span><span style="font-family:宋體">）標準緩沖液一般可保存</span><span style="font-family:Calibri">2</span><span style="font-family:宋體">～</span><span style="font-family:Calibri">3</span><span style="font-family:宋體">個月，但發(fā)現(xiàn)有渾濁、發(fā)霉或沉淀等現(xiàn)象時，不能繼續(xù)使用</span><span style="font-family:Calibri">PH</span><span 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