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什么是PH計的一點校準?
瀏覽次數:2175發布日期:2021-01-27

任何一種pH計都必須經過pH標準溶液的校準后才可測量樣品的pH值,對于測量精度在0.1pH以下的樣品,可以采用一點校準方法調整儀器,一般選用pH6.86或pH7.00標準緩沖液。有些儀器本身精度只0.2pH或0.1pH,因此儀器只設有一個“定位”調節旋鈕。具體操作步驟如下:

(1)測量標準緩沖液溫度,查表確定該溫度下的pHs值,將溫度補償旋鈕調節到該溫度下。

(2)用純水沖洗電極并甩干。

(3)將電極浸入緩沖溶液晃動后靜止放置,待讀數穩定后,調節定位旋鈕使儀器顯示該標準溶液的pHs值。

(4)取出電極沖洗并甩干。

(5)測量樣品溫度,并將pH計溫度補償旋鈕調節至該溫度值。

(6)將電極浸入樣品溶液,晃動后靜止放置,顯示穩定后讀數。

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