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酸度計的概述及使用步驟

時間:2011/10/19閱讀:978
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酸度計是測定溶液pH值的儀器。酸度計的主體是精密的電位計。測定時把復合電極插在被測溶液中,由于被測溶液的酸度(氫離子濃度)不同而產(chǎn)生不同的電動勢,將它通過直流放大器放大,zui后由讀數(shù)指示器(電壓表)指出被測溶液的pH值。酸度計能在0~14pH值范圍內(nèi)使用。;酸度計有臺式、便攜式、表型式等多種,讀數(shù)指示器有數(shù)字式和指針式兩種。①校正:先將儀器斜率調(diào)節(jié)器調(diào)節(jié)在100%位置,再根據(jù)被測溶液的溫度,調(diào)節(jié)溫度調(diào)節(jié)器到該溫度值。②定位:把復合電極插入儀器。選擇一種zui接近樣品pH值的緩沖溶液,把電極放入這一緩沖溶液里,搖動燒杯,使溶液均勻。待讀數(shù)穩(wěn)定后,該讀數(shù)應是緩沖溶液的pH值,否則就要調(diào)節(jié)定位調(diào)節(jié)器。用于分析精度要求較高的測定時,要選擇兩種緩沖溶液(即被測樣品的pH值在該兩種緩沖溶液的pH值之間或接近)。待第種緩沖溶液的pH值讀數(shù)穩(wěn)定后,該讀數(shù)應為該緩沖溶液的pH值,否則調(diào)節(jié)定位調(diào)節(jié)器。清洗電極,吸干電極球泡表面的余液。把電極放入第二種緩沖溶液中,搖動燒杯使溶液均勻,待讀數(shù)穩(wěn)定后,該讀數(shù)應是第二種緩沖溶液的pH值,否則調(diào)節(jié)斜率調(diào)節(jié)器。③測量:經(jīng)過pH標定的儀器,即可用來測定樣品的pH值。這時溫度調(diào)節(jié)器、定位調(diào)節(jié)器、斜率調(diào)節(jié)器都不能再動。用蒸餾水清洗電極,用濾紙吸干電極球部后,把電極插在盛有被測樣品的燒杯內(nèi),輕輕搖動燒杯,待讀數(shù)穩(wěn)定后,就顯示被測樣品的pH值。

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