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face="Times New Roman" style="font-family: "Times New Roman"; font-size: 10.5pt;">pH</font><font face="宋體" style="font-size: 10.5pt;">值變化所引起的電極輸出電位的變化值）惡化，花費較長(cháng)時(shí)間才能達到穩定電位。一般電極的使用壽命可達兩年。另外，溫度對老化也有較大影響，</font><font face="Times New Roman" style="font-family: "Times New Roman"; font-size: 10.5pt;">100℃</font><font face="宋體" style="font-size: 10.5pt;">下貯存幾周的老化程度相當于室溫下貯存一年的老化程度。</font><p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:10.5000pt; font-family:'Times New Roman'; "><o:p></o:p></span></p><p class="p0" style="margin-bottom:0pt; margin-top:0pt; "><span style="mso-spacerun:'yes'; font-size:10.5000pt; font-family:'Times New Roman'; ">　　<font face="Times New Roman">pH</font><font face="宋體">計具有測量準確、可靠性高、安裝及維護方便等優(yōu)點(diǎn)，同時(shí)對污染也較敏感，需要經(jīng)常標定，一般每隔一個(gè)到一個(gè)半月標定一次，每?jì)赡旮鼡Q一次電極。</font></span><span style="mso-spacerun:'yes'; font-size:10.5000pt; font-family:'Times New Roman'; "><o:p></o:p></span></p> </div> <div 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