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mso-hansi-font-family:'Times New Roman'"> ①玻璃電極在含油以及大量懸浮物的堿性溶液中易被油污染，易結垢，影響測量精度；</span><br /><span lang="EN-US"><o:p></o:p></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'"> ②在溫度較高</span><span lang="EN-US">（</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">大于</span><st1:chmetcnv hasspace="False" negative="False" numbertype="1" sourcevalue="50" tcsc="0" unitname="℃" w:st="on"><span lang="EN-US">50</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">℃</span></st1:chmetcnv><span lang="EN-US">）</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">環(huán)境中，使用壽命只有一個(gè)月左右；</span><br /><span lang="EN-US"><o:p></o:p></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'"> ③由于玻璃電極下端用來(lái)進(jìn)行離子交換的玻璃球只有</span><st1:chmetcnv hasspace="False" negative="False" numbertype="1" sourcevalue=".2" tcsc="0" unitname="mm" w:st="on"><span lang="EN-US">0.2mm</span></st1:chmetcnv><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">厚，很脆弱，容易被打碎；</span><br /><span lang="EN-US"><o:p></o:p></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'"> ④由于玻璃電極內阻抗大，信號連接要求很高，稍有污染或結露，信號即刻失真；</span><br /><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'"> ⑤玻璃電極在</span><st1:chmetcnv hasspace="False" negative="False" numbertype="1" sourcevalue="0" tcsc="0" unitname="℃" w:st="on"><span lang="EN-US">0</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">℃</span></st1:chmetcnv><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">以下溫度環(huán)境時(shí)會(huì )破裂。</span><br /><span lang="EN-US"><o:p></o:p></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'"> 二、為什么使用金屬銻電極？有什么優(yōu)點(diǎn)？</span><br /><span lang="EN-US"><o:p></o:p></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'"> 銻電極是一種氧化還原電極，當金屬銻表面與被測溶液接觸后，表面被氧化生成</span><span lang="EN-US">Sb<sub>2</sub>O<sub>3</sub></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">，金屬銻與氧化物之間的電位差取決于</span><span lang="EN-US">Sb<sub>2</sub>O<sub>3</sub></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">的濃度，而</span><span lang="EN-US"> Sb<sub>2</sub>O<sub>3</sub></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">的濃度與溶液中的氫離子濃度有關(guān)，因此，可以通過(guò)測量銻—三氧化二銻之間的電位差來(lái)測量溶液的</span><span lang="EN-US">pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">值，為了保證連續測量溶液的</span><span lang="EN-US">pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">值，應隨時(shí)對與被測溶液接觸的金屬銻電極表面的污垢和氧化物進(jìn)行清洗，以保持金屬銻電極的新鮮表面與被測溶液接觸，從而再形成一層新的</span><span lang="EN-US">Sb<sub>2</sub>O<sub>3</sub></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">薄面，反復幾遍這樣的操作，能保持溶液</span><span lang="EN-US">pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">值的測量精度。</span><br /><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'"> 銻電極優(yōu)點(diǎn)表現：制造簡(jiǎn)單，響應快，便于工業(yè)</span><span lang="EN-US">PH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">計在線(xiàn)測量，可應用于含有氰化物、硫化物、還原性糖、生物堿、含水酒精溶液中；不足之處是金屬銻電極的測量精度不高，當</span><span lang="EN-US">pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">在</span><span lang="EN-US">2</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">～</span><span lang="EN-US">7</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">之間時(shí)，其線(xiàn)性在±</span><span lang="EN-US">0.01pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">之內，</span><span lang="EN-US">pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">＝</span><span lang="EN-US">7</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">～</span><span lang="EN-US">12</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">則偏差達</span><span lang="EN-US">0.4</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">～</span><span lang="EN-US">0.5pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">。金屬銻電極</span><span lang="EN-US"> pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">－</span><span lang="EN-US">mV </span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">在堿性溶液中斜率不同，即轉換系數線(xiàn)性差。</span><span lang="EN-US">pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">－</span><span lang="EN-US">mV</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">轉換溫度系數不是常數，且呈非線(xiàn)性關(guān)系，表</span><span lang="EN-US">1</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">－</span><span lang="EN-US">1</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">給出了金屬銻電極在</span><span lang="EN-US">3</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">種標準緩沖溶液中的</span><span lang="EN-US">pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">－</span><span lang="EN-US">mV</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">轉換特性及該特性與溶液溫度的關(guān)系</span><span lang="EN-US">（</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">該數據范圍主要是針對油田污水而列出的</span><span lang="EN-US">）</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">。</span><br /><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'"> 金屬銻電極在堿性溶液中測量誤差較大，而且隨溫度增加，測量誤差增大。研究表明，這主要是由于</span><span lang="EN-US">Sb<sub>2</sub>O<sub>3</sub></span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">電位受溫度影響較大，而且在不同溫度下影響程度不一樣。因此，不僅需要對溫度進(jìn)行補償，還需要對溫度變化系數進(jìn)行補償。由于金屬銻電有很強的溫度效應且沒(méi)有固定的理論公式，所以用計算機進(jìn)行數據處理時(shí)，力求通過(guò)各種補償方式來(lái)盡量準確地反映真實(shí)值，用能斯特公式計算后，配合溫度的補償，可以比較容易地得出溶液的</span><span lang="EN-US">pH</span><span style="font-family:宋體; mso-ascii-font-family:'Times New Roman'; mso-hansi-font-family:'Times New Roman'">值。</span></span></p> </div> <div id="nhbhpnv" 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