セルフキャリブレーション および ストレージ of pH 電極
問題 する 検討する 使用中 a pH メーター (酸性度 メートル) 含む: その 完全性 の 電極 すべき ある 検査 最初 使用前 使用。
1: チェック to see if the ガラス 電球 is fractured or 壊れた before using the pH closed composite Electrode. If not, it is often considered as accept when using the pH buffer solution for two-point calibration and the positioning and slope buttons can be change to the 対応する pH value. 代わりに, the 電極 活性化 治療 can be 実行 in accordance with the handbook。
(1) The pH 電極 活性化 手順 関与 浸漬 it in 4 パーセント 水素 フッ化物 溶液 for about 3 to 5 seconds, 除去 it, すすぎ it with purified water, and then calibating it in 0}.1mol/L 塩酸 酸 溶液 使用 a 緩衝液 with a pH of 6.86 (25 degree ) for positioning, in other words. after adjust the slope, select a different pH buffer 解決策 電極 しなければならない ある 変更 if it できない ある 調整。
外部 参照 溶液 for the PH 非閉鎖 複合材 電極 is 3 mol/L カリウム 塩化物 溶液, so it is required to check かどうか the 電極's カリウム 塩化物 溶液 含有量 is より大きい より 1/3. if it is not, 3 mol/L カリウム 塩化物 溶液 すべき be added. if the カリウム 塩化物 溶液 上昇 上 the 場所 of the small hole, shake off the extra solution until it is below the small hole, then inspect the solution for bubbles. if bubbles are present, flick the 電極 to entotally elient them.In order to use the 電極, the rubber covering it must be 剥がす 剥がす to reveal a tiny hole. if not, a 負 圧力 will be created while the analysis, 予防 the カリウム 塩化物 溶液 from passing through the glass bulb to exchange ions with the measured solution. will lead to erroneous measurement data. the rubber should be replace after the measurement is finished to close the little hole.
3. To keep the electrode bulb wet, the pH electrode should be washed with distilled water and then soaked in a 3 mol/L potassium chloride solution. To get the electrode to the best measuring state, let it sit in the solution for a few hours. In practice, it has been observed that some analysts treat the composite electrode like a glass electrode and give it a lengthy bath in distilled water. This is wrong because it will significantly lower the amount of potassium chloride solution in the composite electrode, which would lead to The composite electrode shouldn't be left in distilled water for an extended period of time since the electrode reaction is not sensitive during measurement, which may eventually result in false measurement data.
